Encoding formats – Medialooks Help Center

All CPU codecs from the following table is the FFMpeg based video codecs. GPU codecs is a custom implementation of Medialooks team.

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Additional attributes

Name	Type	Default	Description
split_channels	option_fixed	0	Split the overall audio channel into individual audio tracks, where each track contains a specific number of channels specified by the split_channels property. For example, if you record an input source with 12 audio channels and split_channels='4', you will get 3 audio tracks, each containing 4 audio channels Supported values: `0`, `1`, `2`, `4`, `6`, `8`.
scc_capture	option_fixed	true	Capture SCC Closed Captioning Supported values: `true`, `false`.
anc_capture	option_fixed	false	Capture ANC Closed Captioning Supported values: `true`, `false`.
packetsize	int		set packet size (from 0 to INT_MAX) (default 0)
fflags	flags		FFmpeg fflags option. (default autobsf) Supported values: `flush_packets`, `bitexact`, `autobsf`. `flush_packets`: reduce the latency by flushing out packets immediately `bitexact`: do not write random/volatile data `autobsf`: add needed bsfs automatically
fdebug	flags		print specific debug info (default 0) Supported values: `ts`, `id3v2`. `ts`: ts `id3v2`: id3v2
max_delay	int		maximum muxing or demuxing delay in microseconds (from -1 to INT_MAX) (default -1)
start_time_realtime	string		wall-clock time when stream begins (PTS==0) (from I64_MIN to I64_MAX) (default I64_MIN)
audio_preload	int		microseconds by which audio packets should be interleaved earlier (from 0 to 2.14748e+09) (default 0)
chunk_duration	int		microseconds for each chunk (from 0 to 2.14748e+09) (default 0)
chunk_size	int		size in bytes for each chunk (from 0 to 2.14748e+09) (default 0)
flush_packets	int		enable flushing of the I/O context after each packet (from -1 to 1) (default -1)
metadata_header_padding	int		set number of bytes to be written as padding in a metadata header (from -1 to INT_MAX) (default -1)
output_ts_offset	string		set output timestamp offset (default 0)
max_interleave_delta	string		maximum buffering duration for interleaving (from 0 to I64_MAX) (default 10000000)
f_strict	option		how strictly to follow the standards (deprecated; use strict, save via avconv) (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
strict	option		how strictly to follow the standards (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
avoid_negative_ts	option		shift timestamps so they start at 0 (from -1 to 2) (default auto) Supported values: `auto`, `disabled`, `make_non_negative`, `make_zero`. `auto`: -1: enabled when required by target format `disabled`: 0: do not change timestamps `make_non_negative`: 1: shift timestamps so they are non negative `make_zero`: 2: shift timestamps so they start at 0
raw_video	string		MWriter only (legacy FFmpeg encoder): also write the encoded video stream to this file path
raw_audio	string		MWriter only (legacy FFmpeg encoder): also write the encoded audio stream of track 0 to this file path; raw_audio.N for track N

Video codec attributes

Default format codec

Name	Type	Default	Description
b	int	5M	Set video bitrate (in bits/s). Support unit prefixes such as K or M

Audio codec attributes

Default format codec

Name	Type	Default	Description
b	int	128000	Set audio bitrate (in bits/s). Support unit prefixes such as K

Video codecs

Default format codec
AV1 (FFmpeg VPL-MSDK, HW)
Apple ProRes (Legacy, SW)
Apple ProRes (iCodec Pro, SW)
DNxHD (Avid, SW)
DV / DVCPRO HD (SW)
FLV / Sorenson Spark (H.263, SW)
H.264 AVC (AMD AMF, HW)
H.264 AVC (Cisco OpenH264, SW)
H.264 AVC (FFmpeg VPL-MSDK, HW)
H.264 AVC (Intel QuickSync, SW)
H.264 AVC (Intel QuickSync, HW)
H.264 AVC (libx264, SW)
H.264 AVC (NVIDIA NVENC, HW)
H.264 AVC (NVIDIA NVENC Lossless, HW)
H.265 HEVC (AMD AMF, HW)
H.265 HEVC (FFmpeg VPL-MSDK, HW)
H.265 HEVC (Intel QuickSync, HW)
H.265 HEVC (NVIDIA NVENC, HW)
H.265 HEVC (NVIDIA NVENC Lossless, HW)
H.265 HEVC (x265, SW)
HuffYUV (Lossless, SW)
JPEG 2000 (OpenJPEG, SW)
MJPEG (Motion JPEG, SW)
MPEG-1 Video (SW)
MPEG-2 Video (SW)
MPEG-4 Part 2 Video (ASP, SW)
QuickTime Animation (RLE, SW)
VP8 (Google, SW)
VP9 (Google, SW)
WMV8 (Windows Media Video 8, SW)
No Video (Disabled)

Audio codecs

Default format codec
AAC (Advanced Audio Coding)
AC-3 (Dolby Digital, Floating-Point)
AC-3 (Dolby Digital, Fixed-Point)
ADPCM IMA QuickTime
ADPCM Microsoft
ALAC (Apple Lossless)
E-AC-3 (Dolby Digital Plus)
MP2 (MPEG Audio Layer 2)
MP3 (LAME, MPEG Audio Layer 3)
Ogg Vorbis
PCM 16-bit Signed LE
PCM 24-bit Signed LE
PCM 24-bit D-Cinema
PCM 32-bit Signed LE
PCM 32-bit Float LE
No Audio (Disabled)

AAC (Audio File, ADTS)

Configuration Parameter: adts

Extensions: aac

Additional attributes

Name	Type	Description
write_id3v2	option_fixed	Enable ID3v2 tag writing (default false) Supported values: `false`, `true`.
write_apetag	option_fixed	Enable APE tag writing (default false) Supported values: `false`, `true`.
write_mpeg2	option_fixed	Set MPEG version to MPEG-2 (default false) Supported values: `false`, `true`.
packetsize	int	set packet size (from 0 to INT_MAX) (default 0)
fflags	flags	FFmpeg fflags option. (default autobsf) Supported values: `flush_packets`, `bitexact`, `autobsf`. `flush_packets`: reduce the latency by flushing out packets immediately `bitexact`: do not write random/volatile data `autobsf`: add needed bsfs automatically
fdebug	flags	print specific debug info (default 0) Supported values: `ts`, `id3v2`. `ts`: ts `id3v2`: id3v2
max_delay	int	maximum muxing or demuxing delay in microseconds (from -1 to INT_MAX) (default -1)
start_time_realtime	string	wall-clock time when stream begins (PTS==0) (from I64_MIN to I64_MAX) (default I64_MIN)
audio_preload	int	microseconds by which audio packets should be interleaved earlier (from 0 to 2.14748e+09) (default 0)
chunk_duration	int	microseconds for each chunk (from 0 to 2.14748e+09) (default 0)
chunk_size	int	size in bytes for each chunk (from 0 to 2.14748e+09) (default 0)
flush_packets	int	enable flushing of the I/O context after each packet (from -1 to 1) (default -1)
metadata_header_padding	int	set number of bytes to be written as padding in a metadata header (from -1 to INT_MAX) (default -1)
output_ts_offset	string	set output timestamp offset (default 0)
max_interleave_delta	string	maximum buffering duration for interleaving (from 0 to I64_MAX) (default 10000000)
f_strict	option	how strictly to follow the standards (deprecated; use strict, save via avconv) (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
strict	option	how strictly to follow the standards (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
avoid_negative_ts	option	shift timestamps so they start at 0 (from -1 to 2) (default auto) Supported values: `auto`, `disabled`, `make_non_negative`, `make_zero`. `auto`: -1: enabled when required by target format `disabled`: 0: do not change timestamps `make_non_negative`: 1: shift timestamps so they are non negative `make_zero`: 2: shift timestamps so they start at 0

Video codecs

No Video (Disabled)

Audio codecs

AAC (Advanced Audio Coding)

AC-3 (Audio File)

Configuration Parameter: ac3

Extensions: ac3

Additional attributes

Name	Type	Description
packetsize	int	set packet size (from 0 to INT_MAX) (default 0)
fflags	flags	FFmpeg fflags option. (default autobsf) Supported values: `flush_packets`, `bitexact`, `autobsf`. `flush_packets`: reduce the latency by flushing out packets immediately `bitexact`: do not write random/volatile data `autobsf`: add needed bsfs automatically
fdebug	flags	print specific debug info (default 0) Supported values: `ts`, `id3v2`. `ts`: ts `id3v2`: id3v2
max_delay	int	maximum muxing or demuxing delay in microseconds (from -1 to INT_MAX) (default -1)
start_time_realtime	string	wall-clock time when stream begins (PTS==0) (from I64_MIN to I64_MAX) (default I64_MIN)
audio_preload	int	microseconds by which audio packets should be interleaved earlier (from 0 to 2.14748e+09) (default 0)
chunk_duration	int	microseconds for each chunk (from 0 to 2.14748e+09) (default 0)
chunk_size	int	size in bytes for each chunk (from 0 to 2.14748e+09) (default 0)
flush_packets	int	enable flushing of the I/O context after each packet (from -1 to 1) (default -1)
metadata_header_padding	int	set number of bytes to be written as padding in a metadata header (from -1 to INT_MAX) (default -1)
output_ts_offset	string	set output timestamp offset (default 0)
max_interleave_delta	string	maximum buffering duration for interleaving (from 0 to I64_MAX) (default 10000000)
f_strict	option	how strictly to follow the standards (deprecated; use strict, save via avconv) (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
strict	option	how strictly to follow the standards (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
avoid_negative_ts	option	shift timestamps so they start at 0 (from -1 to 2) (default auto) Supported values: `auto`, `disabled`, `make_non_negative`, `make_zero`. `auto`: -1: enabled when required by target format `disabled`: 0: do not change timestamps `make_non_negative`: 1: shift timestamps so they are non negative `make_zero`: 2: shift timestamps so they start at 0

Video codecs

No Video (Disabled)

Audio codecs

AC-3 (Dolby Digital, Floating-Point)
AC-3 (Dolby Digital, Fixed-Point)

ASF (Advanced Streaming Format)

Configuration Parameter: asf

Extensions: asf,wmv,wma

Additional attributes

Name	Type	Default	Description
split_channels	option_fixed	0	Split the overall audio channel into individual audio tracks, where each track contains a specific number of channels specified by the split_channels property. For example, if you record an input source with 12 audio channels and split_channels='4', you will get 3 audio tracks, each containing 4 audio channels Supported values: `0`, `1`, `2`, `4`, `6`, `8`.
scc_capture	option_fixed	true	Capture SCC Closed Captioning Supported values: `true`, `false`.
anc_capture	option_fixed	false	Capture ANC Closed Captioning Supported values: `true`, `false`.
embed_cc	bool	false	Enable embedding Closed Captions (ATSC) into elementary video stream
raw_video	string		MWriter only (legacy FFmpeg encoder): also write the encoded video stream to this file path
raw_audio	string		MWriter only (legacy FFmpeg encoder): also write the encoded audio stream of track 0 to this file path; raw_audio.N for track N
ignore_pts	option_fixed		MWriter only (legacy FFmpeg encoder): number video frames by a frame counter instead of the sample times Supported values: `false`, `true`.
packet_size	int		Packet size (from 100 to 65536) (default 3200)
packetsize	int		set packet size (from 0 to INT_MAX) (default 0)
fflags	flags		FFmpeg fflags option. (default autobsf) Supported values: `flush_packets`, `bitexact`, `autobsf`. `flush_packets`: reduce the latency by flushing out packets immediately `bitexact`: do not write random/volatile data `autobsf`: add needed bsfs automatically
fdebug	flags		print specific debug info (default 0) Supported values: `ts`, `id3v2`. `ts`: ts `id3v2`: id3v2
max_delay	int		maximum muxing or demuxing delay in microseconds (from -1 to INT_MAX) (default -1)
start_time_realtime	string		wall-clock time when stream begins (PTS==0) (from I64_MIN to I64_MAX) (default I64_MIN)
audio_preload	int		microseconds by which audio packets should be interleaved earlier (from 0 to 2.14748e+09) (default 0)
chunk_duration	int		microseconds for each chunk (from 0 to 2.14748e+09) (default 0)
chunk_size	int		size in bytes for each chunk (from 0 to 2.14748e+09) (default 0)
flush_packets	int		enable flushing of the I/O context after each packet (from -1 to 1) (default -1)
metadata_header_padding	int		set number of bytes to be written as padding in a metadata header (from -1 to INT_MAX) (default -1)
output_ts_offset	string		set output timestamp offset (default 0)
max_interleave_delta	string		maximum buffering duration for interleaving (from 0 to I64_MAX) (default 10000000)
f_strict	option		how strictly to follow the standards (deprecated; use strict, save via avconv) (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
strict	option		how strictly to follow the standards (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
avoid_negative_ts	option		shift timestamps so they start at 0 (from -1 to 2) (default auto) Supported values: `auto`, `disabled`, `make_non_negative`, `make_zero`. `auto`: -1: enabled when required by target format `disabled`: 0: do not change timestamps `make_non_negative`: 1: shift timestamps so they are non negative `make_zero`: 2: shift timestamps so they start at 0

Video codecs

Default format codec
DV / DVCPRO HD (SW)
FLV / Sorenson Spark (H.263, SW)
H.264 AVC (AMD AMF, HW)
H.264 AVC (Cisco OpenH264, SW)
H.264 AVC (FFmpeg VPL-MSDK, HW)
H.264 AVC (Intel QuickSync, SW)
H.264 AVC (Intel QuickSync, HW)
H.264 AVC (libx264, SW)
H.264 AVC (NVIDIA NVENC, HW)
H.264 AVC (NVIDIA NVENC Lossless, HW)
HuffYUV (Lossless, SW)
MJPEG (Motion JPEG, SW)
MPEG-1 Video (SW)
MPEG-2 Video (SW)
MPEG-4 Part 2 Video (ASP, SW)
VP8 (Google, SW)
VP9 (Google, SW)
WMV8 (Windows Media Video 8, SW)
No Video (Disabled)

Audio codecs

Default format codec
AAC (Advanced Audio Coding)
AC-3 (Dolby Digital, Floating-Point)
AC-3 (Dolby Digital, Fixed-Point)
ADPCM Microsoft
MP2 (MPEG Audio Layer 2)
MP3 (LAME, MPEG Audio Layer 3)
Ogg Vorbis
PCM 16-bit Signed LE
PCM 24-bit Signed LE
PCM 32-bit Signed LE
PCM 32-bit Float LE
No Audio (Disabled)

Video codec attributes

Default format codec

Name	Type	Default	Description
b	int	5M	Set video bitrate (in bits/s). Support unit prefixes such as K or M

Audio codec attributes

Default format codec

Name	Type	Default	Description
b	int	128000	Set audio bitrate (in bits/s). Support unit prefixes such as K

AVI (Audio Video Interleaved)

Configuration Parameter: avi

Extensions: avi

Additional attributes

Name	Type	Default	Description
split_channels	option_fixed	0	Split the overall audio channel into individual audio tracks, where each track contains a specific number of channels specified by the split_channels property. For example, if you record an input source with 12 audio channels and split_channels='4', you will get 3 audio tracks, each containing 4 audio channels Supported values: `0`, `1`, `2`, `4`, `6`, `8`.
scc_capture	option_fixed	true	Capture SCC Closed Captioning Supported values: `true`, `false`.
anc_capture	option_fixed	false	Capture ANC Closed Captioning Supported values: `true`, `false`.
embed_cc	bool	false	Enable embedding Closed Captions (ATSC) into elementary video stream
raw_video	string		MWriter only (legacy FFmpeg encoder): also write the encoded video stream to this file path
raw_audio	string		MWriter only (legacy FFmpeg encoder): also write the encoded audio stream of track 0 to this file path; raw_audio.N for track N
start_timecode	option	auto	Set start timecode for encoding. Possible values are: auto (default), disabled, local_time or a custom string like "10:00:00:00" Supported values: `auto`, `disabled`, `local_time`.
ignore_pts	option_fixed		MWriter only (legacy FFmpeg encoder): number video frames by a frame counter instead of the sample times Supported values: `false`, `true`.
reserve_index_space	int	0	Reserve space (in bytes) at the beginning of the file for each stream index Range: minimum 0.0; maximum 2147483647.
write_channel_mask	option_fixed		Write the channel layout mask into the audio stream header. This option is enabled by default. Disabling the channel mask can be useful in specific scenarios, e.g. when merging multiple audio streams into one for compatibility with software that only supports a single audio stream in AVI Supported values: `false`, `true`.
flipped_raw_rgb	option_fixed		Raw RGB bitmaps are stored bottom-up (default false) Supported values: `false`, `true`.
packetsize	int		set packet size (from 0 to INT_MAX) (default 0)
fflags	flags		FFmpeg fflags option. (default autobsf) Supported values: `flush_packets`, `bitexact`, `autobsf`. `flush_packets`: reduce the latency by flushing out packets immediately `bitexact`: do not write random/volatile data `autobsf`: add needed bsfs automatically
fdebug	flags		print specific debug info (default 0) Supported values: `ts`, `id3v2`. `ts`: ts `id3v2`: id3v2
max_delay	int		maximum muxing or demuxing delay in microseconds (from -1 to INT_MAX) (default -1)
start_time_realtime	string		wall-clock time when stream begins (PTS==0) (from I64_MIN to I64_MAX) (default I64_MIN)
audio_preload	int		microseconds by which audio packets should be interleaved earlier (from 0 to 2.14748e+09) (default 0)
chunk_duration	int		microseconds for each chunk (from 0 to 2.14748e+09) (default 0)
chunk_size	int		size in bytes for each chunk (from 0 to 2.14748e+09) (default 0)
flush_packets	int		enable flushing of the I/O context after each packet (from -1 to 1) (default -1)
metadata_header_padding	int		set number of bytes to be written as padding in a metadata header (from -1 to INT_MAX) (default -1)
output_ts_offset	string		set output timestamp offset (default 0)
max_interleave_delta	string		maximum buffering duration for interleaving (from 0 to I64_MAX) (default 10000000)
f_strict	option		how strictly to follow the standards (deprecated; use strict, save via avconv) (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
strict	option		how strictly to follow the standards (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
avoid_negative_ts	option		shift timestamps so they start at 0 (from -1 to 2) (default auto) Supported values: `auto`, `disabled`, `make_non_negative`, `make_zero`. `auto`: -1: enabled when required by target format `disabled`: 0: do not change timestamps `make_non_negative`: 1: shift timestamps so they are non negative `make_zero`: 2: shift timestamps so they start at 0

Video codecs

Default format codec
AV1 (FFmpeg VPL-MSDK, HW)
DPX (Digital Picture eXchange, SW)
FFV1 (Lossless, SW)
FLV / Sorenson Spark (H.263, SW)
H.264 AVC (AMD AMF, HW)
H.264 AVC (Cisco OpenH264, SW)
H.264 AVC (FFmpeg VPL-MSDK, HW)
H.264 AVC (Intel QuickSync, SW)
H.264 AVC (Intel QuickSync, HW)
H.264 AVC (libx264, SW)
H.264 AVC (NVIDIA NVENC, HW)
H.264 AVC (NVIDIA NVENC Lossless, HW)
H.265 HEVC (AMD AMF, HW)
H.265 HEVC (FFmpeg VPL-MSDK, HW)
H.265 HEVC (Intel QuickSync, HW)
H.265 HEVC (NVIDIA NVENC, HW)
H.265 HEVC (NVIDIA NVENC Lossless, HW)
H.265 HEVC (x265, SW)
Hap (Vidvox, SW)
HuffYUV (Lossless, SW)
JPEG 2000 (OpenJPEG, SW)
MJPEG (Motion JPEG, SW)
MPEG-1 Video (SW)
MPEG-2 Video (SW)
MPEG-4 Part 2 Video (ASP, SW)
PNG (Image Sequence, SW)
Uncompressed 4:2:2 8-bit (SW)
Uncompressed 4:2:2 10-bit (SW)
VP8 (Google, SW)
VP9 (Google, SW)
WMV8 (Windows Media Video 8, SW)
Direct Stream Copy (No Re-Encoding)
No Video (Disabled)

Audio codecs

Default format codec
AAC (Advanced Audio Coding)
AC-3 (Dolby Digital, Floating-Point)
AC-3 (Dolby Digital, Fixed-Point)
ADPCM Microsoft
MP2 (MPEG Audio Layer 2)
MP3 (LAME, MPEG Audio Layer 3)
Ogg Vorbis
PCM 16-bit Signed LE
PCM 24-bit Signed LE
PCM 32-bit Signed LE
PCM 32-bit Float LE
Direct Stream Copy (No Re-Encoding)
No Audio (Disabled)

Video codec attributes

Default format codec

Name	Type	Default	Description
b	int	5M	Set video bitrate (in bits/s). Support unit prefixes such as K or M

Audio codec attributes

Default format codec

Name	Type	Default	Description
b	int	128000	Set audio bitrate (in bits/s). Support unit prefixes such as K

DV (Digital Video)

Configuration Parameter: dv

Extensions: dv

Additional attributes

Name	Type	Default	Description
split_channels	option_fixed	0	Split the overall audio channel into individual audio tracks, where each track contains a specific number of channels specified by the split_channels property. For example, if you record an input source with 12 audio channels and split_channels='4', you will get 3 audio tracks, each containing 4 audio channels Supported values: `0`, `1`, `2`, `4`, `6`, `8`.
scc_capture	option_fixed	true	Capture SCC Closed Captioning Supported values: `true`, `false`.
anc_capture	option_fixed	false	Capture ANC Closed Captioning Supported values: `true`, `false`.
raw_video	string		MWriter only (legacy FFmpeg encoder): also write the encoded video stream to this file path
raw_audio	string		MWriter only (legacy FFmpeg encoder): also write the encoded audio stream of track 0 to this file path; raw_audio.N for track N
start_timecode	option	auto	Set start timecode for encoding. Possible values are: auto (default), disabled, local_time or a custom string like "10:00:00:00" Supported values: `auto`, `disabled`, `local_time`.
ignore_pts	option_fixed		MWriter only (legacy FFmpeg encoder): number video frames by a frame counter instead of the sample times Supported values: `false`, `true`.
packetsize	int		set packet size (from 0 to INT_MAX) (default 0)
fflags	flags		FFmpeg fflags option. (default autobsf) Supported values: `flush_packets`, `bitexact`, `autobsf`. `flush_packets`: reduce the latency by flushing out packets immediately `bitexact`: do not write random/volatile data `autobsf`: add needed bsfs automatically
fdebug	flags		print specific debug info (default 0) Supported values: `ts`, `id3v2`. `ts`: ts `id3v2`: id3v2
max_delay	int		maximum muxing or demuxing delay in microseconds (from -1 to INT_MAX) (default -1)
start_time_realtime	string		wall-clock time when stream begins (PTS==0) (from I64_MIN to I64_MAX) (default I64_MIN)
audio_preload	int		microseconds by which audio packets should be interleaved earlier (from 0 to 2.14748e+09) (default 0)
chunk_duration	int		microseconds for each chunk (from 0 to 2.14748e+09) (default 0)
chunk_size	int		size in bytes for each chunk (from 0 to 2.14748e+09) (default 0)
flush_packets	int		enable flushing of the I/O context after each packet (from -1 to 1) (default -1)
metadata_header_padding	int		set number of bytes to be written as padding in a metadata header (from -1 to INT_MAX) (default -1)
output_ts_offset	string		set output timestamp offset (default 0)
max_interleave_delta	string		maximum buffering duration for interleaving (from 0 to I64_MAX) (default 10000000)
f_strict	option		how strictly to follow the standards (deprecated; use strict, save via avconv) (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
strict	option		how strictly to follow the standards (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
avoid_negative_ts	option		shift timestamps so they start at 0 (from -1 to 2) (default auto) Supported values: `auto`, `disabled`, `make_non_negative`, `make_zero`. `auto`: -1: enabled when required by target format `disabled`: 0: do not change timestamps `make_non_negative`: 1: shift timestamps so they are non negative `make_zero`: 2: shift timestamps so they start at 0

Video codecs

DV (Digital Video)

Audio codecs

PCM 16-bit Signed LE
No Audio (Disabled)

Video codec attributes

DV (Digital Video)

Name	Type	Default	Description
dv_format	option_fixed	dvsd	DV format Supported values: `dvsd`, `dv25`.
top	int		Field order for interlaced files (-1 - auto, 0 - bottom first, 1 - top first) Range: minimum -1; maximum 1.

DVB-Compatible Streaming (MPEG-TS DVB)

Configuration Parameter: dvb

Extensions: udp://

Additional attributes

Name	Type	Default	Description
split_channels	option_fixed	0	Split the overall audio channel into individual audio tracks, where each track contains a specific number of channels specified by the split_channels property. For example, if you record an input source with 12 audio channels and split_channels='4', you will get 3 audio tracks, each containing 4 audio channels Supported values: `0`, `1`, `2`, `4`, `6`, `8`.
embed_cc	bool	false	Enable embedding Closed Captions (ATSC) into elementary video stream
embed_scte35	bool	false	Enable embedding SCTE-35 triggers into MPEG transport stream
service_name	string	MService001	Set Service Name
service_provider	string	Medialooks	Set Service Provider
transport_stream_id	int	1	Set the transport_stream_id. This identifies a transponder in DVB. Default is 0x0001 Range: minimum 1; maximum 65535.
original_network_id	int	1	Set the original_network_id. This is unique identifier of a network in DVB. Its main use is in the unique identification of a service through the path Original_Network_ID, Transport_Stream_ID. Default is 0x0001 Range: minimum 1; maximum 65535.
muxrate	int	1	Set a constant muxrate. Default is VBR Range: minimum 0; maximum 2147483647.
service_id	int	1	Set service_id field Range: minimum 1; maximum 65535.
service_type	option_fixed	digital_tv	Service type Supported values: `digital_tv`, `mpeg2_digital_hdtv`, `advanced_codec_digital_sdtv`, `advanced_codec_digital_hdtv`, `hevc_digital_hdtv`, `digital_radio`, `teletext`, `advanced_codec_digital_radio`. `digital_tv`: Digital Television. `digital_radio`: Digital Radio. `teletext`: Teletext. `advanced_codec_digital_radio`: Advanced Codec Digital Radio. `mpeg2_digital_hdtv`: MPEG2 Digital HDTV. `advanced_codec_digital_sdtv`: Advanced Codec Digital SDTV. `advanced_codec_digital_hdtv`: Advanced Codec Digital HDTV. `hevc_digital_hdtv`: HEVC Digital Television Service.
pmt_start_pid	int	192	Set the first pid of the PMT Range: minimum 32; maximum 8186.
start_pid	int	1024	Set the first pid Range: minimum 32; maximum 8186.
pes_payload_size	int	0	Set minimum PES packet payload in bytes. Default is 0: each audio frame is sent in its own PES packet Range: minimum 0.0; maximum 2147483647.
mpegts_flags	flags	+system_b	MPEG-TS muxing flags Reemit PAT/PMT before writing the next packetReemit PAT and PMT at each video frameUse LATM packetization for AACConform to System B (DVB) instead of System A (ATSC) Supported values: `resend_headers`, `latm`, `pat_pmt_at_frames`, `system_b`, `initial_discontinuity`, `nit`, `omit_rai`. `initial_discontinuity`: Mark initial packets as discontinuous `nit`: Enable NIT transmission `omit_rai`: Disable writing of random access indicator
start_timecode	option	auto	Set start timecode for encoding. Possible values are: auto (default), disabled, local_time or a custom string like "10:00:00:00" Supported values: `auto`, `disabled`, `local_time`.
tables_version	int	0	Set PAT, PMT, SDT and NIT version (default 0, valid values are from 0 to 31, inclusively). This option allows updating stream structure so that standard consumer may detect the change
rc_buffers	int	8	Rate-Control buffers
rc_sync_msec	int	1	Rate-Control precision (in msec, minimum 1 msec)
rc_max_underflow_msec	int	30	Rate-Control max underflow time, after this time the clock corrected (in msec)
pcr_period	int	20	Override the PCR retransmission interval in milliseconds. The SDK preset default is 20 ms. Set -1 for automatic selection: 20 ms for CBR streams, or the highest multiple of the frame duration below 100 ms for VBR streams. Range: minimum -1; maximum 2147483647.
pat_period	double	0.1	PAT/PMT retransmission time limit in seconds (default 100 msec)
sdt_period	double	0.5	SDT retransmission time limit in seconds (default 500 msec, no transmit -1) Range: minimum -1.0.
nit_period	double	9.0	NIT retransmission time limit in seconds (default 9 s, no transmit -1) Range: minimum -1.0.
tdt_period	double	25.0	TDT retransmission time limit in seconds (default 25 s, no transmit -1) Range: minimum -1.0.
eit_period	double	1.5	EIT present/following retransmission time limit in seconds (default 1.5 s, no transmit -1) Range: minimum -1.0.
flush_packets	int	-1	Enable flushing of the I/O context after each packet Range: minimum -1; maximum 1.
max_delay	int	700000	Set maximum multiplexing PTS/PCR delay in microseconds Range: minimum 0.
start_pcr	double	0.0	Set the start PCR value in second Range: minimum 0; maximum 2147483647.
muxer.buffer_min	int	5	Set number of packets that should be accumulated in the multiplexer queue before processing begins Range: minimum 0.
muxer.buffer_max	int	10	Set maximum multiplexer packets queue size Range: minimum 0.
cc_language	string	und	ISO 639-2 language of one configured digital caption service advertised in PMT when embed_cc is enabled. Empty or invalid values use und. No automatic service detection or caption encoding conversion. Supported video: H.264, MPEG-2 and MPEG-4; no descriptor in M2TS/BDAV; unsupported video codecs produce a warning
cc_service	int	1	CEA-708 caption service number advertised in PMT Range: minimum 1; maximum 63.
cc_korean_code	bool	true	Korean extension per KCS.KO-07.0093 (2013), section 4.2, Table 4.7: false for KS X 1001, true for Unicode when cc_language=kor. For other languages the A/65 reserved bit remains 1. Signalling only; caption bytes are not converted
cc_easy_reader	bool	false	CEA-708 caption service easy-reader flag
cc_wide_aspect	bool	true	CEA-708 caption service wide-aspect-ratio flag
scte35_pid	int	-1	Set SCTE-35 stream PID. Use -1 for automatic PID assignment
mpegts_m2ts_mode	option_fixed		Enable M2TS mode. auto enables it when the file extension is .m2ts (FFmpeg default auto). Supported values: `auto`, `false`, `true`.
mpegts_copyts	option_fixed		Do not offset DTS/PTS by max_delay; auto and false offset them (FFmpeg default auto). Supported values: `auto`, `false`, `true`.
omit_video_pes_length	option_fixed		Omit the PES packet length for video packets (default true) Supported values: `false`, `true`.
dvb	option_fixed		DVB compatible MPEG-TS (NIT on, PAT/PMT not forced at video frames). The writer sets true for this format (SDK default true). Supported values: `false`, `true`.
buffer_size	int		System data size (in bytes) (from -1 to INT_MAX) (default -1)
bitrate	string		Bits to send per second (from 0 to I64_MAX) (default 0)
burst_bits	string		Max length of bursts in bits (when using bitrate) (from 0 to I64_MAX) (default 0)
localport	int		Local port (from -1 to INT_MAX) (default -1)
local_port	int		Local port (from -1 to INT_MAX) (default -1)
localaddr	string		Local address
udplite_coverage	int		choose UDPLite head size which should be validated by checksum (from 0 to INT_MAX) (default 0)
pkt_size	int		Maximum UDP packet size. The writer adds pkt_size=1316 to a DVB UDP URL that has no pkt_size, and the URL value overrides this property: set it in the URL, e.g. udp://239.0.0.1:1234?pkt_size=1316 Range: minimum -1; maximum 2147483647.
reuse	option_fixed		explicitly allow reusing UDP sockets (default auto) Supported values: `auto`, `false`, `true`.
reuse_socket	option_fixed		explicitly allow reusing UDP sockets (default auto) Supported values: `auto`, `false`, `true`.
broadcast	option_fixed		explicitly allow or disallow broadcast destination (default false) Supported values: `false`, `true`.
ttl	int		Time to live (multicast only) (from 0 to 255) (default 16)
dscp	int		DSCP class for outgoing packets (from -1 to 63) (default -1)
connect	option_fixed		set if connect() should be called on socket (default false) Supported values: `false`, `true`.
sources	string		Source list
block	string		Block list
packetsize	int		set packet size (from 0 to INT_MAX) (default 0)
fflags	flags		FFmpeg fflags option. (default autobsf) Supported values: `flush_packets`, `bitexact`, `autobsf`. `flush_packets`: reduce the latency by flushing out packets immediately `bitexact`: do not write random/volatile data `autobsf`: add needed bsfs automatically
fdebug	flags		print specific debug info (default 0) Supported values: `ts`, `id3v2`. `ts`: ts `id3v2`: id3v2
start_time_realtime	string		wall-clock time when stream begins (PTS==0) (from I64_MIN to I64_MAX) (default I64_MIN)
audio_preload	int		microseconds by which audio packets should be interleaved earlier (from 0 to 2.14748e+09) (default 0)
chunk_duration	int		microseconds for each chunk (from 0 to 2.14748e+09) (default 0)
chunk_size	int		size in bytes for each chunk (from 0 to 2.14748e+09) (default 0)
metadata_header_padding	int		set number of bytes to be written as padding in a metadata header (from -1 to INT_MAX) (default -1)
output_ts_offset	string		set output timestamp offset (default 0)
max_interleave_delta	string		maximum buffering duration for interleaving (from 0 to I64_MAX) (default 10000000)
f_strict	option		how strictly to follow the standards (deprecated; use strict, save via avconv) (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
strict	option		how strictly to follow the standards (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
avoid_negative_ts	option		shift timestamps so they start at 0 (from -1 to 2) (default auto) Supported values: `auto`, `disabled`, `make_non_negative`, `make_zero`. `auto`: -1: enabled when required by target format `disabled`: 0: do not change timestamps `make_non_negative`: 1: shift timestamps so they are non negative `make_zero`: 2: shift timestamps so they start at 0

Video codecs

Default format codec
AV1 (FFmpeg VPL-MSDK, HW)
H.264 AVC (AMD AMF, HW)
H.264 AVC (Cisco OpenH264, SW)
H.264 AVC (FFmpeg VPL-MSDK, HW)
H.264 AVC (Intel QuickSync, SW)
H.264 AVC (Intel QuickSync, HW)
H.264 AVC (libx264, SW)
H.264 AVC (NVIDIA NVENC, HW)
H.264 AVC (NVIDIA NVENC Lossless, HW)
H.265 HEVC (AMD AMF, HW)
H.265 HEVC (FFmpeg VPL-MSDK, HW)
H.265 HEVC (Intel QuickSync, HW)
H.265 HEVC (NVIDIA NVENC, HW)
H.265 HEVC (NVIDIA NVENC Lossless, HW)
H.265 HEVC (x265, SW)
H.266 VVC (Fraunhofer VVenC, SW)
MPEG-2 Video (SW)
MPEG-4 Part 2 Video (ASP, SW)
Direct Stream Copy (No Re-Encoding)
No Video (Disabled)

Audio codecs

Default format codec
AAC (Advanced Audio Coding)
AC-3 (Dolby Digital, Floating-Point)
AC-3 (Dolby Digital, Fixed-Point)
MP2 (MPEG Audio Layer 2)
MP3 (LAME, MPEG Audio Layer 3)
Direct Stream Copy (No Re-Encoding)
No Audio (Disabled)

Video codec attributes

Default format codec

Name	Type	Default	Description
b	int	5M	Set video bitrate (in bits/s). Support unit prefixes such as K or M

Audio codec attributes

Default format codec

Name	Type	Default	Description
b	int	128000	Set audio bitrate (in bits/s). Support unit prefixes such as K

DVB-Compatible Streaming (MPEG-TS over RTP)

Configuration Parameter: dvb

Protocol: rtp://

Additional attributes

Name	Type	Default	Description
split_channels	option_fixed	0	Split the overall audio channel into individual audio tracks, where each track contains a specific number of channels specified by the split_channels property. For example, if you record an input source with 12 audio channels and split_channels='4', you will get 3 audio tracks, each containing 4 audio channels Supported values: `0`, `1`, `2`, `4`, `6`, `8`.
embed_cc	bool	false	Enable embedding Closed Captions (ATSC) into elementary video stream
cc_language	string	und	ISO 639-2 language of one configured digital caption service advertised in PMT when embed_cc is enabled. Empty or invalid values use und. No automatic service detection or caption encoding conversion. Supported video: H.264, MPEG-2 and MPEG-4; no descriptor in M2TS/BDAV; unsupported video codecs produce a warning
cc_service	int	1	CEA-708 caption service number advertised in PMT Range: minimum 1; maximum 63.
cc_korean_code	bool	true	Korean extension per KCS.KO-07.0093 (2013), section 4.2, Table 4.7: false for KS X 1001, true for Unicode when cc_language=kor. For other languages the A/65 reserved bit remains 1. Signalling only; caption bytes are not converted
cc_easy_reader	bool	false	CEA-708 caption service easy-reader flag
cc_wide_aspect	bool	true	CEA-708 caption service wide-aspect-ratio flag
embed_scte35	bool	false	Enable embedding SCTE-35 triggers into MPEG transport stream
service_name	string	MService001	Set Service Name
service_provider	string	Medialooks	Set Service Provider
transport_stream_id	int	1	Set the transport_stream_id. This identifies a transponder in DVB. Default is 0x0001 Range: minimum 1; maximum 65535.
original_network_id	int	1	Set the original_network_id. This is unique identifier of a network in DVB. Its main use is in the unique identification of a service through the path Original_Network_ID, Transport_Stream_ID. Default is 0x0001 Range: minimum 1; maximum 65535.
muxrate	int	1	Set a constant muxrate. Default is VBR Range: minimum 0; maximum 2147483647.
service_id	int	1	Set service_id field Range: minimum 1; maximum 65535.
service_type	option_fixed	digital_tv	Service type Supported values: `digital_tv`, `mpeg2_digital_hdtv`, `advanced_codec_digital_sdtv`, `advanced_codec_digital_hdtv`, `hevc_digital_hdtv`, `digital_radio`, `teletext`, `advanced_codec_digital_radio`. `digital_tv`: Digital Television. `digital_radio`: Digital Radio. `teletext`: Teletext. `advanced_codec_digital_radio`: Advanced Codec Digital Radio. `mpeg2_digital_hdtv`: MPEG2 Digital HDTV. `advanced_codec_digital_sdtv`: Advanced Codec Digital SDTV. `advanced_codec_digital_hdtv`: Advanced Codec Digital HDTV. `hevc_digital_hdtv`: HEVC Digital Television Service.
pmt_start_pid	int	192	Set the first pid of the PMT Range: minimum 32; maximum 8186.
start_pid	int	1024	Set the first pid Range: minimum 32; maximum 8186.
pes_payload_size	int	0	Set minimum PES packet payload in bytes. Default is 0: each audio frame is sent in its own PES packet Range: minimum 0.0; maximum 2147483647.
mpegts_flags	flags	+system_b	MPEG-TS muxing flags Supported values: `resend_headers`, `latm`, `pat_pmt_at_frames`, `system_b`, `initial_discontinuity`, `nit`, `omit_rai`. `resend_headers`: Reemit PAT/PMT before writing the next packet `pat_pmt_at_frames`: Reemit PAT and PMT at each video frame `latm`: Use LATM packetization for AAC `system_b`: Conform to System B (DVB) instead of System A (ATSC) `initial_discontinuity`: Mark initial packets as discontinuous `nit`: Enable NIT transmission `omit_rai`: Disable writing of random access indicator
start_timecode	option	auto	Set start timecode for encoding. Possible values are: auto (default), disabled, local_time or a custom string like "10:00:00:00" Supported values: `auto`, `disabled`, `local_time`.
tables_version	int	0	Set PAT, PMT, SDT and NIT version (default 0, valid values are from 0 to 31, inclusively). This option allows updating stream structure so that standard consumer may detect the change
rc_buffers	int	8	Rate-Control buffers
rc_sync_msec	int	1	Rate-Control precision (in msec, minimum 1 msec)
rc_max_underflow_msec	int	30	Rate-Control max underflow time, after this time the clock corrected (in msec)
pcr_period	int	20	Override the PCR retransmission interval in milliseconds. The SDK preset default is 20 ms. Set -1 for automatic selection: 20 ms for CBR streams, or the highest multiple of the frame duration below 100 ms for VBR streams. Range: minimum -1; maximum 2147483647.
pat_period	double	0.1	PAT/PMT retransmission time limit in seconds (default 100 msec)
sdt_period	double	0.5	SDT retransmission time limit in seconds (default 500 msec, no transmit -1) Range: minimum -1.0.
nit_period	double	9.0	NIT retransmission time limit in seconds (default 9 s, no transmit -1) Range: minimum -1.0.
tdt_period	double	25.0	TDT retransmission time limit in seconds (default 25 s, no transmit -1) Range: minimum -1.0.
eit_period	double	1.5	EIT present/following retransmission time limit in seconds (default 1.5 s, no transmit -1) Range: minimum -1.0.
flush_packets	int	-1	Enable flushing of the I/O context after each packet Range: minimum -1; maximum 1.
max_delay	int	700000	Set maximum multiplexing PTS/PCR delay in microseconds Range: minimum 0.
start_pcr	double	0.0	Set the start PCR value in second Range: minimum 0; maximum 2147483647.
muxer.buffer_min	int	5	Set number of packets that should be accumulated in the multiplexer queue before processing begins Range: minimum 0.
muxer.buffer_max	int	10	Set maximum multiplexer packets queue size Range: minimum 0.
mpegts_m2ts_mode	option_fixed		Enable M2TS mode. auto enables it when the file extension is .m2ts (FFmpeg default auto). Supported values: `auto`, `false`, `true`.
mpegts_copyts	option_fixed		Do not offset DTS/PTS by max_delay; auto and false offset them (FFmpeg default auto). Supported values: `auto`, `false`, `true`.
omit_video_pes_length	option_fixed		Omit the PES packet length for video packets (default true) Supported values: `false`, `true`.
ttl	int		Time to live (multicast only) (from -1 to 255) (default -1)
buffer_size	int		Send/Receive buffer size (in bytes) (from -1 to INT_MAX) (default -1)
rtcp_port	int		Custom rtcp port (from -1 to INT_MAX) (default -1)
rtcpport	int		Custom rtcp port (from -1 to INT_MAX) (default -1)
local_rtpport	int		Local rtp port (from -1 to INT_MAX) (default -1)
localrtpport	int		Local rtp port (from -1 to INT_MAX) (default -1)
local_rtcpport	int		Local rtcp port (from -1 to INT_MAX) (default -1)
localrtcpport	int		Local rtcp port (from -1 to INT_MAX) (default -1)
connect	option_fixed		Connect socket (default false) Supported values: `false`, `true`.
write_to_source	option_fixed		Send packets to the source address of the latest received packet (default false) Supported values: `false`, `true`.
pkt_size	int		Maximum packet size (from -1 to INT_MAX) (default -1)
dscp	int		DSCP class (from -1 to INT_MAX) (default -1)
timeout	string		set timeout (in microseconds) of socket I/O operations (from -1 to I64_MAX) (default -1)
sources	string		Source list
block	string		Block list
fec	string		FEC
localaddr	string		Local address
packetsize	int		set packet size (from 0 to INT_MAX) (default 0)
fflags	flags		FFmpeg fflags option. (default autobsf) Supported values: `flush_packets`, `bitexact`, `autobsf`. `flush_packets`: reduce the latency by flushing out packets immediately `bitexact`: do not write random/volatile data `autobsf`: add needed bsfs automatically
fdebug	flags		print specific debug info (default 0) Supported values: `ts`, `id3v2`. `ts`: ts `id3v2`: id3v2
start_time_realtime	string		wall-clock time when stream begins (PTS==0) (from I64_MIN to I64_MAX) (default I64_MIN)
audio_preload	int		microseconds by which audio packets should be interleaved earlier (from 0 to 2.14748e+09) (default 0)
chunk_duration	int		microseconds for each chunk (from 0 to 2.14748e+09) (default 0)
chunk_size	int		size in bytes for each chunk (from 0 to 2.14748e+09) (default 0)
metadata_header_padding	int		set number of bytes to be written as padding in a metadata header (from -1 to INT_MAX) (default -1)
output_ts_offset	string		set output timestamp offset (default 0)
max_interleave_delta	string		maximum buffering duration for interleaving (from 0 to I64_MAX) (default 10000000)
f_strict	option		how strictly to follow the standards (deprecated; use strict, save via avconv) (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
strict	option		how strictly to follow the standards (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
avoid_negative_ts	option		shift timestamps so they start at 0 (from -1 to 2) (default auto) Supported values: `auto`, `disabled`, `make_non_negative`, `make_zero`. `auto`: -1: enabled when required by target format `disabled`: 0: do not change timestamps `make_non_negative`: 1: shift timestamps so they are non negative `make_zero`: 2: shift timestamps so they start at 0

Video codec attributes

Default format codec

Name	Type	Default	Description
b	int	5M	Set video bitrate (in bits/s). Support unit prefixes such as K or M

Audio codec attributes

Default format codec

Name	Type	Default	Description
b	int	128000	Set audio bitrate (in bits/s). Support unit prefixes such as K

Video codecs

Default format codec
AV1 (FFmpeg VPL-MSDK, HW)
H.264 AVC (AMD AMF, HW)
H.264 AVC (Cisco OpenH264, SW)
H.264 AVC (FFmpeg VPL-MSDK, HW)
H.264 AVC (Intel QuickSync, SW)
H.264 AVC (Intel QuickSync, HW)
H.264 AVC (libx264, SW)
H.264 AVC (NVIDIA NVENC, HW)
H.264 AVC (NVIDIA NVENC Lossless, HW)
H.265 HEVC (AMD AMF, HW)
H.265 HEVC (FFmpeg VPL-MSDK, HW)
H.265 HEVC (Intel QuickSync, HW)
H.265 HEVC (NVIDIA NVENC, HW)
H.265 HEVC (NVIDIA NVENC Lossless, HW)
H.265 HEVC (x265, SW)
H.266 VVC (Fraunhofer VVenC, SW)
MPEG-2 Video (SW)
MPEG-4 Part 2 Video (ASP, SW)
Direct Stream Copy (No Re-Encoding)
No Video (Disabled)

Audio codecs

Default format codec
AAC (Advanced Audio Coding)
AC-3 (Dolby Digital, Floating-Point)
AC-3 (Dolby Digital, Fixed-Point)
MP2 (MPEG Audio Layer 2)
MP3 (LAME, MPEG Audio Layer 3)
Direct Stream Copy (No Re-Encoding)
No Audio (Disabled)

DVD Video (VOB Files)

Configuration Parameter: vob

Extensions: vob

Additional attributes

Name	Type	Default	Description
split_channels	option_fixed	0	Split the overall audio channel into individual audio tracks, where each track contains a specific number of channels specified by the split_channels property. For example, if you record an input source with 12 audio channels and split_channels='4', you will get 3 audio tracks, each containing 4 audio channels Supported values: `0`, `1`, `2`, `4`, `6`, `8`.
scc_capture	option_fixed	true	Capture SCC Closed Captioning Supported values: `true`, `false`.
anc_capture	option_fixed	false	Capture ANC Closed Captioning Supported values: `true`, `false`.
embed_cc	bool	false	Enable embedding Closed Captions (ATSC) into elementary video stream
raw_video	string		MWriter only (legacy FFmpeg encoder): also write the encoded video stream to this file path
raw_audio	string		MWriter only (legacy FFmpeg encoder): also write the encoded audio stream of track 0 to this file path; raw_audio.N for track N
ignore_pts	option_fixed		MWriter only (legacy FFmpeg encoder): number video frames by a frame counter instead of the sample times Supported values: `false`, `true`.
muxrate	int	0	The combined rate of all video and audio elementary stream packets common to one program. This rate also includes the VBI and sub-picture private stream data, which MPEG treats as a private stream type Range: minimum 0; maximum 1677721200.
preload	int	500000	Initial demux-decode delay in microseconds Range: minimum 0.0; maximum 2147483647.
packetsize	int		set packet size (from 0 to INT_MAX) (default 0)
fflags	flags		FFmpeg fflags option. (default autobsf) Supported values: `flush_packets`, `bitexact`, `autobsf`. `flush_packets`: reduce the latency by flushing out packets immediately `bitexact`: do not write random/volatile data `autobsf`: add needed bsfs automatically
fdebug	flags		print specific debug info (default 0) Supported values: `ts`, `id3v2`. `ts`: ts `id3v2`: id3v2
max_delay	int		maximum muxing or demuxing delay in microseconds (from -1 to INT_MAX) (default -1)
start_time_realtime	string		wall-clock time when stream begins (PTS==0) (from I64_MIN to I64_MAX) (default I64_MIN)
audio_preload	int		microseconds by which audio packets should be interleaved earlier (from 0 to 2.14748e+09) (default 0)
chunk_duration	int		microseconds for each chunk (from 0 to 2.14748e+09) (default 0)
chunk_size	int		size in bytes for each chunk (from 0 to 2.14748e+09) (default 0)
flush_packets	int		enable flushing of the I/O context after each packet (from -1 to 1) (default -1)
metadata_header_padding	int		set number of bytes to be written as padding in a metadata header (from -1 to INT_MAX) (default -1)
output_ts_offset	string		set output timestamp offset (default 0)
max_interleave_delta	string		maximum buffering duration for interleaving (from 0 to I64_MAX) (default 10000000)
f_strict	option		how strictly to follow the standards (deprecated; use strict, save via avconv) (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
strict	option		how strictly to follow the standards (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
avoid_negative_ts	option		shift timestamps so they start at 0 (from -1 to 2) (default auto) Supported values: `auto`, `disabled`, `make_non_negative`, `make_zero`. `auto`: -1: enabled when required by target format `disabled`: 0: do not change timestamps `make_non_negative`: 1: shift timestamps so they are non negative `make_zero`: 2: shift timestamps so they start at 0

Video codecs

Default format codec
AV1 (FFmpeg VPL-MSDK, HW)
H.264 AVC (AMD AMF, HW)
H.264 AVC (Cisco OpenH264, SW)
H.264 AVC (FFmpeg VPL-MSDK, HW)
H.264 AVC (Intel QuickSync, SW)
H.264 AVC (Intel QuickSync, HW)
H.264 AVC (libx264, SW)
H.264 AVC (NVIDIA NVENC, HW)
H.264 AVC (NVIDIA NVENC Lossless, HW)
H.265 HEVC (AMD AMF, HW)
H.265 HEVC (FFmpeg VPL-MSDK, HW)
H.265 HEVC (Intel QuickSync, HW)
H.265 HEVC (NVIDIA NVENC, HW)
H.265 HEVC (NVIDIA NVENC Lossless, HW)
H.265 HEVC (x265, SW)
MPEG-1 Video (SW)
MPEG-2 Video (SW)
MPEG-4 Part 2 Video (ASP, SW)
No Video (Disabled)

Audio codecs

Default format codec
AC-3 (Dolby Digital, Floating-Point)
AC-3 (Dolby Digital, Fixed-Point)
MP2 (MPEG Audio Layer 2)
MP3 (LAME, MPEG Audio Layer 3)
No Audio (Disabled)

Video codec attributes

Default format codec

Name	Type	Default	Description
b	int	5M	Set video bitrate (in bits/s). Support unit prefixes such as K or M

Audio codec attributes

Default format codec

Name	Type	Default	Description
b	int	128000	Set audio bitrate (in bits/s). Support unit prefixes such as K

FLV (Flash Video)

Configuration Parameter: flv

Extensions: flv

Additional attributes

Name	Type	Default	Description
split_channels	option_fixed	0	Split the overall audio channel into individual audio tracks, where each track contains a specific number of channels specified by the split_channels property. For example, if you record an input source with 12 audio channels and split_channels='4', you will get 3 audio tracks, each containing 4 audio channels Supported values: `0`, `1`, `2`, `4`, `6`, `8`.
scc_capture	option_fixed	true	Capture SCC Closed Captioning Supported values: `true`, `false`.
anc_capture	option_fixed	false	Capture ANC Closed Captioning Supported values: `true`, `false`.
raw_video	string		MWriter only (legacy FFmpeg encoder): also write the encoded video stream to this file path
raw_audio	string		MWriter only (legacy FFmpeg encoder): also write the encoded audio stream of track 0 to this file path; raw_audio.N for track N
ignore_pts	option_fixed		MWriter only (legacy FFmpeg encoder): number video frames by a frame counter instead of the sample times Supported values: `false`, `true`.
flvflags	flags		FLV muxer flags (default 0) Supported values: `aac_seq_header_detect`, `no_sequence_end`, `no_metadata`, `no_duration_filesize`, `add_keyframe_index`. `aac_seq_header_detect`: Put AAC sequence header based on stream data `no_sequence_end`: disable sequence end for FLV `no_metadata`: disable metadata for FLV `no_duration_filesize`: disable duration and filesize zero value metadata for FLV `add_keyframe_index`: Add keyframe index metadata
packetsize	int		set packet size (from 0 to INT_MAX) (default 0)
fflags	flags		FFmpeg fflags option. (default autobsf) Supported values: `flush_packets`, `bitexact`, `autobsf`. `flush_packets`: reduce the latency by flushing out packets immediately `bitexact`: do not write random/volatile data `autobsf`: add needed bsfs automatically
fdebug	flags		print specific debug info (default 0) Supported values: `ts`, `id3v2`. `ts`: ts `id3v2`: id3v2
max_delay	int		maximum muxing or demuxing delay in microseconds (from -1 to INT_MAX) (default -1)
start_time_realtime	string		wall-clock time when stream begins (PTS==0) (from I64_MIN to I64_MAX) (default I64_MIN)
audio_preload	int		microseconds by which audio packets should be interleaved earlier (from 0 to 2.14748e+09) (default 0)
chunk_duration	int		microseconds for each chunk (from 0 to 2.14748e+09) (default 0)
chunk_size	int		size in bytes for each chunk (from 0 to 2.14748e+09) (default 0)
flush_packets	int		enable flushing of the I/O context after each packet (from -1 to 1) (default -1)
metadata_header_padding	int		set number of bytes to be written as padding in a metadata header (from -1 to INT_MAX) (default -1)
output_ts_offset	string		set output timestamp offset (default 0)
max_interleave_delta	string		maximum buffering duration for interleaving (from 0 to I64_MAX) (default 10000000)
f_strict	option		how strictly to follow the standards (deprecated; use strict, save via avconv) (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
strict	option		how strictly to follow the standards (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
avoid_negative_ts	option		shift timestamps so they start at 0 (from -1 to 2) (default auto) Supported values: `auto`, `disabled`, `make_non_negative`, `make_zero`. `auto`: -1: enabled when required by target format `disabled`: 0: do not change timestamps `make_non_negative`: 1: shift timestamps so they are non negative `make_zero`: 2: shift timestamps so they start at 0

Video codecs

Default format codec
FLV / Sorenson Spark (H.263, SW)
H.264 AVC (AMD AMF, HW)
H.264 AVC (Cisco OpenH264, SW)
H.264 AVC (FFmpeg VPL-MSDK, HW)
H.264 AVC (Intel QuickSync, SW)
H.264 AVC (Intel QuickSync, HW)
H.264 AVC (libx264, SW)
H.264 AVC (NVIDIA NVENC, HW)
H.264 AVC (NVIDIA NVENC Lossless, HW)
No Video (Disabled)

Audio codecs

AAC (Advanced Audio Coding)
PCM 16-bit Signed LE
No Audio (Disabled)

Video codec attributes

Default format codec

Name	Type	Default	Description
b	int	5M	Set video bitrate (in bits/s). Support unit prefixes such as K or M

GXF (General eXchange Format)

Configuration Parameter: gxf

Extensions: gxf

Additional attributes

Name	Type	Default	Description
split_channels	option_fixed	0	Split the overall audio channel into individual audio tracks, where each track contains a specific number of channels specified by the split_channels property. For example, if you record an input source with 12 audio channels and split_channels='4', you will get 3 audio tracks, each containing 4 audio channels Supported values: `0`, `1`, `2`, `4`, `6`, `8`.
scc_capture	option_fixed	true	Capture SCC Closed Captioning Supported values: `true`, `false`.
anc_capture	option_fixed	false	Capture ANC Closed Captioning Supported values: `true`, `false`.
embed_cc	bool	false	Enable embedding Closed Captions (ATSC) into elementary video stream
raw_video	string		MWriter only (legacy FFmpeg encoder): also write the encoded video stream to this file path
raw_audio	string		MWriter only (legacy FFmpeg encoder): also write the encoded audio stream of track 0 to this file path; raw_audio.N for track N
start_timecode	option	auto	Set start timecode for encoding. Possible values are: auto (default), disabled, local_time or a custom string like "10:00:00:00" Supported values: `auto`, `disabled`, `local_time`.
ignore_pts	option_fixed		MWriter only (legacy FFmpeg encoder): number video frames by a frame counter instead of the sample times Supported values: `false`, `true`.
packetsize	int		set packet size (from 0 to INT_MAX) (default 0)
fflags	flags		FFmpeg fflags option. (default autobsf) Supported values: `flush_packets`, `bitexact`, `autobsf`. `flush_packets`: reduce the latency by flushing out packets immediately `bitexact`: do not write random/volatile data `autobsf`: add needed bsfs automatically
fdebug	flags		print specific debug info (default 0) Supported values: `ts`, `id3v2`. `ts`: ts `id3v2`: id3v2
max_delay	int		maximum muxing or demuxing delay in microseconds (from -1 to INT_MAX) (default -1)
start_time_realtime	string		wall-clock time when stream begins (PTS==0) (from I64_MIN to I64_MAX) (default I64_MIN)
audio_preload	int		microseconds by which audio packets should be interleaved earlier (from 0 to 2.14748e+09) (default 0)
chunk_duration	int		microseconds for each chunk (from 0 to 2.14748e+09) (default 0)
chunk_size	int		size in bytes for each chunk (from 0 to 2.14748e+09) (default 0)
flush_packets	int		enable flushing of the I/O context after each packet (from -1 to 1) (default -1)
metadata_header_padding	int		set number of bytes to be written as padding in a metadata header (from -1 to INT_MAX) (default -1)
output_ts_offset	string		set output timestamp offset (default 0)
max_interleave_delta	string		maximum buffering duration for interleaving (from 0 to I64_MAX) (default 10000000)
f_strict	option		how strictly to follow the standards (deprecated; use strict, save via avconv) (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
strict	option		how strictly to follow the standards (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
avoid_negative_ts	option		shift timestamps so they start at 0 (from -1 to 2) (default auto) Supported values: `auto`, `disabled`, `make_non_negative`, `make_zero`. `auto`: -1: enabled when required by target format `disabled`: 0: do not change timestamps `make_non_negative`: 1: shift timestamps so they are non negative `make_zero`: 2: shift timestamps so they start at 0

Video codecs

MPEG-2 Video PAL
MPEG-2 Video NTSC

Audio codecs

PCM 16-bit Signed LE
No Audio (Disabled)

HLS Streaming (Apple HTTP Live Streaming)

Configuration Parameter: hls

Extensions: m3u8

Additional attributes

Name	Type	Default	Description
embed_cc	bool	false	Enable embedding Closed Captions (ATSC) into elementary video stream
embed_scte35	bool	false	Enable embedding SCTE-35 triggers into HLS stream
start_number	int64	0	Start the playlist sequence number (#EXT-X-MEDIA-SEQUENCE) from the specified number when hls_start_number_source value is generic. (This is the default case.) Unless hls_flags single_file is set, it also specifies starting sequence numbers of segment and subtitle filenames. Default value is 0 Range: minimum 0.0.
hls_time	double	2.0	Set the target segment length. Default value is 2. Duration must be a time duration specification. Segment will be cut on the next key frame after this time has passed Range: minimum 0.0.
hls_init_time	double	0.0	Set the initial target segment length. Default value is 0. Duration must be a time duration specification. Segment will be cut on the next key frame after this time has passed on the first m3u8 list. After the initial playlist is filled, ffmpeg will cut segments at duration equal to hls_time Range: minimum 0.0.
hls_list_size	int	5	Set the maximum number of playlist entries. If set to 0 the list file will contain all the segments. Default value is 5 Range: minimum 0.0; maximum 2147483647.
hls_delete_threshold	int	1	Set the number of unreferenced segments to keep on disk before hls_flags delete_segments deletes them. Increase this to allow continue clients to download segments which were recently referenced in the playlist. Default value is 1, meaning segments older than hls_list_size+1 will be deleted Range: minimum 1.0; maximum 2147483647.
hls_vtt_options	string		Set hls vtt list of options for the container format used for hls
hls_allow_cache	int	-1	Explicitly set whether the client MAY (1) or MUST NOT (0) cache media segments Range: minimum -2147483648; maximum 2147483647.
hls_base_url	string		Append baseurl to every entry in the playlist. Useful to generate playlists with absolute paths. Note that the playlist sequence number must be unique for each segment and it is not to be confused with the segment filename sequence number which can be cyclic, for example if the wrap option is specified
hls_segment_filename	string		Set the segment filename. Unless the hls_flags option is set with ‘single_file’, filename is used as a string format with the segment number appended
hls_segment_size	int	0	Maximum size per segment file (in bytes) Range: minimum 0.0; maximum 2147483647.
hls_key_info_file	string		Use the information in key_info_file for segment encryption. The first line of key_info_file specifies the key URI written to the playlist. The key URL is used to access the encryption key during playback. The second line specifies the path to the key file used to obtain the key during the encryption process. The key file is read as a single packed array of 16 octets in binary format. The optional third line specifies the initialization vector (IV) as a hexadecimal string to be used instead of the segment sequence number (default) for encryption. Changes to key_info_file will result in segment encryption with the new key/IV and an entry in the playlist for the new key URI/IV if hls_flags periodic_rekey is enabled
hls_enc	option_fixed		Enable (1) or disable (0) the AES128 encryption. When enabled every segment generated is encrypted and the encryption key is saved as playlist name.key Supported values: `false`, `true`.
hls_enc_key	string		Specify a 16-octet key to encrypt the segments, by default it is randomly generated
hls_enc_key_url	string		If set, keyurl is prepended instead of baseurl to the key filename in the playlist
hls_enc_iv	string		Specify the 16-octet initialization vector for every segment instead of the autogenerated ones
hls_subtitle_path	string		Set path of hls subtitles
hls_segment_type	option	mpegts	Set hls segment files type Supported values: `mpegts`, `fmp4`. `mpegts`: Output segment files in MPEG-2 Transport Stream format. This is compatible with all HLS versions `fmp4`: Output segment files in fragmented MP4 format, similar to MPEG-DASH. fmp4 files may be used in HLS version 7 and above
segment_type	option_fixed		Output segment files in MPEG-2 Transport Stream format. This is compatible with all HLS versionsOutput segment files in fragmented MP4 format, similar to MPEG-DASH. fmp4 files may be used in HLS version 7 and above Supported values: `mpegts`, `fmp4`.
hls_fmp4_init_filename	string	init.mp4	Set filename for the fragment files header file, default filename is init.mp4. When strftime is enabled, filename is expanded to the segment filename with localtime
hls_flags	flags		Set flags affecting HLS playlist and media file generation Supported values: `single_file`, `temp_file`, `delete_segments`, `round_durations`, `discont_start`, `omit_endlist`, `split_by_time`, `append_list`, `program_date_time`, `second_level_segment_index`, `second_level_segment_duration`, `second_level_segment_size`, `periodic_rekey`, `independent_segments`, `iframes_only`. `single_file`: If this flag is set, the muxer will store all segments in a single MPEG-TS file, and will use byte ranges in the playlist. HLS playlists generated with this way will have the version number 4 `temp_file`: Write segment data to filename.tmp and rename to filename only once the segment is complete `delete_segments`: Segment files removed from the playlist are deleted after a period of time equal to the duration of the segment plus the duration of the playlist `round_durations`: Round the duration info in the playlist file segment info to integer values, instead of using floating point. If there are no other features requiring higher HLS versions be used, then this will allow ffmpeg to output a HLS version 2 m3u8 `discont_start`: Add the #EXT-X-DISCONTINUITY tag to the playlist, before the first segment’s information `omit_endlist`: Do not append the EXT-X-ENDLIST tag at the end of the playlist `split_by_time`: Allow segments to start on frames other than key frames. This improves behavior on some players when the time between key frames is inconsistent, but may make things worse on others, and can cause some oddities during seeking. This flag should be used with the hls_time option `append_list`: Append new segments into the end of old segment list, and remove the #EXT-X-ENDLIST from the old segment list `program_date_time`: Generate EXT-X-PROGRAM-DATE-TIME tags `second_level_segment_index`: Make it possible to use segment indexes as %%d in the hls_segment_filename option expression besides date/time values when strftime option is on. To get fixed width numbers with trailing zeroes, %%0xd format is available where x is the required width `second_level_segment_duration`: Make it possible to use segment duration (calculated in microseconds) as %%t in hls_segment_filename option expression besides date/time values when strftime is on. To get fixed width numbers with trailing zeroes, %%0xt format is available where x is the required width `second_level_segment_size`: Make it possible to use segment sizes (counted in bytes) as %%s in hls_segment_filename option expression besides date/time values when strftime is on. To get fixed width numbers with trailing zeroes, %%0xs format is available where x is the required width `periodic_rekey`: The file specified by hls_key_info_file will be checked periodically and detect updates to the encryption info. Be sure to replace this file atomically, including the file containing the AES encryption key `independent_segments`: Add the #EXT-X-INDEPENDENT-SEGMENTS tag to playlists that has video segments and when all the segments of that playlist are guaranteed to start with a key frame `iframes_only`: add EXT-X-I-FRAMES-ONLY, whenever applicable
flags	flags		If this flag is set, the muxer will store all segments in a single MPEG-TS file, and will use byte ranges in the playlist. HLS playlists generated with this way will have the version number 4Write segment data to filename.tmp and rename to filename only once the segment is completeSegment files removed from the playlist are deleted after a period of time equal to the duration of the segment plus the duration of the playlistRound the duration info in the playlist file segment info to integer values, instead of using floating point. If there are no other features requiring higher HLS versions be used, then this will allow ffmpeg to output a HLS version 2 m3u8Add the #EXT-X-DISCONTINUITY tag to the playlist, before the first segment’s informationDo not append the EXT-X-ENDLIST tag at the end of the playlistAllow segments to start on frames other than key frames. This improves behavior on some players when the time between key frames is inconsistent, but may make things worse on others, and can cause some oddities during seeking. This flag should be used with the hls_time optionAppend new segments into the end of old segment list, and remove the #EXT-X-ENDLIST from the old segment listGenerate EXT-X-PROGRAM-DATE-TIME tagsMake it possible to use segment indexes as %%d in the hls_segment_filename option expression besides date/time values when strftime option is on. To get fixed width numbers with trailing zeroes, %%0xd format is available where x is the required widthMake it possible to use segment duration (calculated in microseconds) as %%t in hls_segment_filename option expression besides date/time values when strftime is on. To get fixed width numbers with trailing zeroes, %%0xt format is available where x is the required widthMake it possible to use segment sizes (counted in bytes) as %%s in hls_segment_filename option expression besides date/time values when strftime is on. To get fixed width numbers with trailing zeroes, %%0xs format is available where x is the required widthThe file specified by hls_key_info_file will be checked periodically and detect updates to the encryption info. Be sure to replace this file atomically, including the file containing the AES encryption keyAdd the #EXT-X-INDEPENDENT-SEGMENTS tag to playlists that has video segments and when all the segments of that playlist are guaranteed to start with a key frame Supported values: `single_file`, `temp_file`, `delete_segments`, `round_durations`, `discont_start`, `omit_endlist`, `split_by_time`, `append_list`, `program_date_time`, `second_level_segment_index`, `second_level_segment_duration`, `second_level_segment_size`, `periodic_rekey`, `independent_segments`, `iframes_only`. `iframes_only`: add EXT-X-I-FRAMES-ONLY, whenever applicable
hls_playlist_type	option		Set the HLS playlist type Supported values: `event`, `vod`. `event`: Emit #EXT-X-PLAYLIST-TYPE:EVENT in the m3u8 header. This forces hls_list_size to 0; the playlist can only be appended to `vod`: Emit #EXT-X-PLAYLIST-TYPE:VOD in the m3u8 header. This forces hls_list_size to 0; the playlist must not change
pl_type	option_fixed		Emit #EXT-X-PLAYLIST-TYPE:EVENT in the m3u8 header. This forces hls_list_size to 0; the playlist can only be appended toEmit #EXT-X-PLAYLIST-TYPE:VOD in the m3u8 header. This forces hls_list_size to 0; the playlist must not change Supported values: `event`, `vod`.
method	string		Use the given HTTP method to create the hls files (default: PUT)
hls_start_number_source	option	generic	Start the playlist sequence number (#EXT-X-MEDIA-SEQUENCE) according to the specified source. Unless hls_flags single_file is set, it also specifies source of starting sequence numbers of segment and subtitle filenames. In any case, if hls_flags append_list is set and read playlist sequence number is greater than the specified start sequence number, then that value will be used as start value Supported values: `generic`, `epoch`, `datetime`, `epoch_us`. `generic`: start_number value (default) `epoch`: seconds since epoch `datetime`: current datetime as YYYYMMDDhhmmss `epoch_us`: microseconds since epoch
start_sequence_source_type	option_fixed		start_number value (default)seconds since epochcurrent datetime as YYYYMMDDhhmmss Supported values: `generic`, `epoch`, `datetime`, `epoch_us`. `epoch_us`: microseconds since epoch
http_user_agent	string		Override User-Agent field in HTTP header. Applicable only for HTTP output
var_stream_map	string		Specify a map string defining how to group the audio, video and subtitle streams into different variant streams. The variant stream groups are separated by space. Expected string format is like this "a:0,v:0 a:1,v:1 ....". Here a:, v:, s: are the keys to specify audio, video and subtitle streams respectively. Allowed values are 0 to 9 (limited just based on practical usage)
cc_stream_map	string		Map string which specifies different closed captions groups and their attributes. The closed captions stream groups are separated by space. The closed captions groups configured using this option are mapped to different variant streams by providing the same ccgroup name in the var_stream_map string
master_pl_name	string		Create HLS master playlist with the given name
master_pl_publish_rate	int	0	Publish master play list repeatedly every after specified number of segment intervals Range: minimum 0.0; maximum 4294967295.
http_persistent	option_fixed		Use persistent HTTP connections. Applicable only for HTTP output Supported values: `false`, `true`.
timeout	string		Set timeout for socket I/O operations. Applicable only for HTTP output
scte35_pid	int	-1	Set SCTE-35 stream PID. Use -1 for automatic PID assignment
hls_segment_options	string		set segments files format options of hls
hls_fmp4_init_resend	option_fixed		resend fragment mp4 init file after refresh m3u8 every time (default false) Supported values: `false`, `true`.
strftime	option_fixed		set filename expansion with strftime at segment creation (default false) Supported values: `false`, `true`.
strftime_mkdir	option_fixed		create last directory component in strftime-generated filename (default false) Supported values: `false`, `true`.
ignore_io_errors	option_fixed		Ignore IO errors for stable long-duration runs with network output (default false) Supported values: `false`, `true`.
headers	string		set custom HTTP headers, can override built in default headers
packetsize	int		set packet size (from 0 to INT_MAX) (default 0)
fflags	flags		FFmpeg fflags option. (default autobsf) Supported values: `flush_packets`, `bitexact`, `autobsf`. `flush_packets`: reduce the latency by flushing out packets immediately `bitexact`: do not write random/volatile data `autobsf`: add needed bsfs automatically
fdebug	flags		print specific debug info (default 0) Supported values: `ts`, `id3v2`. `ts`: ts `id3v2`: id3v2
max_delay	int		maximum muxing or demuxing delay in microseconds (from -1 to INT_MAX) (default -1)
start_time_realtime	string		wall-clock time when stream begins (PTS==0) (from I64_MIN to I64_MAX) (default I64_MIN)
audio_preload	int		microseconds by which audio packets should be interleaved earlier (from 0 to 2.14748e+09) (default 0)
chunk_duration	int		microseconds for each chunk (from 0 to 2.14748e+09) (default 0)
chunk_size	int		size in bytes for each chunk (from 0 to 2.14748e+09) (default 0)
flush_packets	int		enable flushing of the I/O context after each packet (from -1 to 1) (default -1)
metadata_header_padding	int		set number of bytes to be written as padding in a metadata header (from -1 to INT_MAX) (default -1)
output_ts_offset	string		set output timestamp offset (default 0)
max_interleave_delta	string		maximum buffering duration for interleaving (from 0 to I64_MAX) (default 10000000)
f_strict	option		how strictly to follow the standards (deprecated; use strict, save via avconv) (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
strict	option		how strictly to follow the standards (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
avoid_negative_ts	option		shift timestamps so they start at 0 (from -1 to 2) (default auto) Supported values: `auto`, `disabled`, `make_non_negative`, `make_zero`. `auto`: -1: enabled when required by target format `disabled`: 0: do not change timestamps `make_non_negative`: 1: shift timestamps so they are non negative `make_zero`: 2: shift timestamps so they start at 0

Video codecs

Default format codec
AV1 (FFmpeg VPL-MSDK, HW)
H.264 AVC (AMD AMF, HW)
H.264 AVC (Cisco OpenH264, SW)
H.264 AVC (FFmpeg VPL-MSDK, HW)
H.264 AVC (Intel QuickSync, SW)
H.264 AVC (Intel QuickSync, HW)
H.264 AVC (libx264, SW)
H.264 AVC (NVIDIA NVENC, HW)
H.264 AVC (NVIDIA NVENC Lossless, HW)
H.265 HEVC (AMD AMF, HW)
H.265 HEVC (FFmpeg VPL-MSDK, HW)
H.265 HEVC (Intel QuickSync, HW)
H.265 HEVC (NVIDIA NVENC, HW)
H.265 HEVC (NVIDIA NVENC Lossless, HW)
H.265 HEVC (x265, SW)
MPEG-2 Video (SW)
MPEG-4 Part 2 Video (ASP, SW)
Direct Stream Copy (No Re-Encoding)
No Video (Disabled)

Audio codecs

Default format codec
AAC (Advanced Audio Coding)
AC-3 (Dolby Digital, Floating-Point)
AC-3 (Dolby Digital, Fixed-Point)
MP2 (MPEG Audio Layer 2)
MP3 (LAME, MPEG Audio Layer 3)
Direct Stream Copy (No Re-Encoding)
No Audio (Disabled)

Video codec attributes

Default format codec

Name	Type	Default	Description
b	int	5M	Set video bitrate (in bits/s). Support unit prefixes such as K or M

Audio codec attributes

Default format codec

Name	Type	Default	Description
b	int	128000	Set audio bitrate (in bits/s). Support unit prefixes such as K

Icecast Streaming (Ogg / Opus / MP3)

Configuration Parameter: icecast

Extensions: icecast://

Additional attributes

Name	Type	Default	Description
ice_genre	string		Set the stream genre
ice_name	string		Set the stream name
ice_description	string		Set the stream description
ice_url	string		Set the stream website URL
ice_public	bool	false	Set if the stream should be public. The default is false (not public)
user_agent	string		Override the User-Agent header. If not specified a string of the form "Lavf/<version>" will be used
password	string		Set the Icecast mountpoint password
content_type	string		Set the stream content type. This must be set if it is different from audio/mpeg
legacy_icecast	bool	false	This enables support for Icecast versions less 2.4.0, that do not support the HTTP PUT method but the SOURCE method
tls	bool	false	Establish a TLS (HTTPS) connection to Icecast
metadata_update_url	string		Set the Icecast metadata update url
metadata_update_credentials	string		Set the Icecast metadata update credentials (login:password)
packetsize	int		set packet size (from 0 to INT_MAX) (default 0)
fflags	flags		FFmpeg fflags option. (default autobsf) Supported values: `flush_packets`, `bitexact`, `autobsf`. `flush_packets`: reduce the latency by flushing out packets immediately `bitexact`: do not write random/volatile data `autobsf`: add needed bsfs automatically
fdebug	flags		print specific debug info (default 0) Supported values: `ts`, `id3v2`. `ts`: ts `id3v2`: id3v2
max_delay	int		maximum muxing or demuxing delay in microseconds (from -1 to INT_MAX) (default -1)
start_time_realtime	string		wall-clock time when stream begins (PTS==0) (from I64_MIN to I64_MAX) (default I64_MIN)
audio_preload	int		microseconds by which audio packets should be interleaved earlier (from 0 to 2.14748e+09) (default 0)
chunk_duration	int		microseconds for each chunk (from 0 to 2.14748e+09) (default 0)
chunk_size	int		size in bytes for each chunk (from 0 to 2.14748e+09) (default 0)
flush_packets	int		enable flushing of the I/O context after each packet (from -1 to 1) (default -1)
metadata_header_padding	int		set number of bytes to be written as padding in a metadata header (from -1 to INT_MAX) (default -1)
output_ts_offset	string		set output timestamp offset (default 0)
max_interleave_delta	string		maximum buffering duration for interleaving (from 0 to I64_MAX) (default 10000000)
f_strict	option		how strictly to follow the standards (deprecated; use strict, save via avconv) (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
strict	option		how strictly to follow the standards (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
avoid_negative_ts	option		shift timestamps so they start at 0 (from -1 to 2) (default auto) Supported values: `auto`, `disabled`, `make_non_negative`, `make_zero`. `auto`: -1: enabled when required by target format `disabled`: 0: do not change timestamps `make_non_negative`: 1: shift timestamps so they are non negative `make_zero`: 2: shift timestamps so they start at 0

Video codecs

No Video (Disabled)

Audio codecs

Default format codec
AAC (Advanced Audio Coding)
FLAC (Free Lossless)
MP3 (LAME, MPEG Audio Layer 3)
Opus (libopus)
Ogg Vorbis
No Audio (Disabled)

Audio codec attributes

Default format codec

Name	Type	Default	Description
b	int	128000	Set audio bitrate (in bits/s). Support unit prefixes such as K

IIS Live Smooth Streaming

Configuration Parameter: ismv

Extensions: http://

Additional attributes

Name	Type	Description
brand	string	Override major brand
empty_hdlr_name	option_fixed	write zero-length name string in hdlr atoms within mdia and minf atoms (default false) Supported values: `false`, `true`.
encryption_key	string	The media encryption key (hex)
encryption_kid	string	The media encryption key identifier (hex)
encryption_scheme	string	Configures the encryption scheme, allowed values are none, cenc-aes-ctr
frag_duration	int	Maximum fragment duration (from 0 to INT_MAX) (default 0)
frag_interleave	int	Interleave samples within fragments (max number of consecutive samples, lower is tighter interleaving, but with more overhead) (from 0 to INT_MAX) (default 0)
frag_size	int	Maximum fragment size (from 0 to INT_MAX) (default 0)
fragment_index	int	Fragment number of the next fragment. Range: minimum 1; maximum 2147483647.
iods_audio_profile	int	iods audio profile atom. (from -1 to 255) (default -1)
iods_video_profile	int	iods video profile atom. (from -1 to 255) (default -1)
ism_lookahead	int	Number of lookahead entries for ISM files (from 0 to 255) (default 0)
movflags	flags	MOV muxer flags (default 0) Supported values: `cmaf`, `dash`, `default_base_moof`, `delay_moov`, `disable_chpl`, `empty_moov`, `faststart`, `frag_custom`, `frag_discont`, `frag_every_frame`, `frag_keyframe`, `global_sidx`, `isml`, `negative_cts_offsets`, `omit_tfhd_offset`, `prefer_icc`, `rtphint`, `separate_moof`, `skip_sidx`, `skip_trailer`, `use_metadata_tags`, `write_colr`, `write_gama`, `hybrid_fragmented`. `cmaf`: Write CMAF compatible fragmented MP4 `dash`: Write DASH compatible fragmented MP4 `default_base_moof`: Set the default-base-is-moof flag in tfhd atoms `delay_moov`: Delay writing the initial moov until the first fragment is cut, or until the first fragment flush `disable_chpl`: Disable Nero chapter atom `empty_moov`: Make the initial moov atom empty `faststart`: Run a second pass to put the index (moov atom) at the beginning of the file `frag_custom`: Flush fragments on caller requests `frag_discont`: Signal that the next fragment is discontinuous from earlier ones `frag_every_frame`: Fragment at every frame `frag_keyframe`: Fragment at video keyframes `global_sidx`: Write a global sidx index at the start of the file `isml`: Create a live smooth streaming feed (for pushing to a publishing point) `negative_cts_offsets`: Use negative CTS offsets (reducing the need for edit lists) `omit_tfhd_offset`: Omit the base data offset in tfhd atoms `prefer_icc`: If writing colr atom prioritise usage of ICC profile if it exists in stream packet side data `rtphint`: Add RTP hint tracks `separate_moof`: Write separate moof/mdat atoms for each track `skip_sidx`: Skip writing of sidx atom `skip_trailer`: Skip writing the mfra/tfra/mfro trailer for fragmented files `use_metadata_tags`: Use mdta atom for metadata. `write_colr`: Write colr atom even if the color info is unspecified (Experimental, may be renamed or changed, do not use from scripts) `write_gama`: Write deprecated gama atom `hybrid_fragmented`: For recoverability, write a fragmented file that is converted to non-fragmented at the end.
moov_size	int	maximum moov size so it can be placed at the begin (from 0 to INT_MAX) (default 0)
min_frag_duration	int	Minimum fragment duration (from 0 to INT_MAX) (default 0)
mov_gamma	double	gamma value for gama atom (from 0 to 10) (default 0)
movie_timescale	int	set movie timescale (from 0 to INT_MAX) (default 0)
rtpflags	flags	RTP muxer flags (default 0) Supported values: `latm`, `rfc2190`, `skip_rtcp`, `h264_mode0`, `send_bye`. `latm`: Use MP4A-LATM packetization instead of MPEG4-GENERIC for AAC `rfc2190`: Use RFC 2190 packetization instead of RFC 4629 for H.263 `skip_rtcp`: Don't send RTCP sender reports `h264_mode0`: Use mode 0 for H.264 in RTP `send_bye`: Send RTCP BYE packets when finishing
skip_iods	option_fixed	Skip writing iods atom. (default true) Supported values: `false`, `true`.
use_editlist	option_fixed	use edit list (default auto) Supported values: `auto`, `false`, `true`.
use_stream_ids_as_track_ids	option_fixed	use stream ids as track ids (default false) Supported values: `false`, `true`.
video_track_timescale	int	set timescale of all video tracks (from 0 to INT_MAX) (default 0)
write_btrt	option_fixed	force or disable writing btrt (default auto) Supported values: `auto`, `false`, `true`.
write_prft	option	Write producer reference time box with specified time source (from 0 to 2) (default 0) Supported values: `pts`, `wallclock`. `pts`: 2: pts `wallclock`: 1: wallclock
write_tmcd	option_fixed	force or disable writing tmcd (default auto) Supported values: `auto`, `false`, `true`.
chunked_post	option_fixed	use chunked transfer-encoding for posts (default true) Supported values: `false`, `true`.
http_proxy	string	set HTTP proxy to tunnel through
headers	string	set custom HTTP headers, can override built in default headers
content_type	string	set a specific content type for the POST messages
multiple_requests	option_fixed	use persistent connections (default false) Supported values: `false`, `true`.
post_data	string	set custom HTTP post data
auth_type	option	HTTP authentication type (from 0 to 1) (default none) Supported values: `none`, `basic`. `none`: 0: No auth method set, autodetect `basic`: 1: HTTP basic authentication
send_expect_100	option_fixed	Force sending an Expect: 100-continue header for POST (default auto) Supported values: `auto`, `false`, `true`.
location	string	The actual location of the data received
method	string	Override the HTTP method or set the expected HTTP method from a client
listen	int	listen on HTTP (from 0 to 2) (default 0)
resource	string	The resource requested by a client
reply_code	int	The http status code to return to a client (from INT_MIN to 599) (default 200)
packetsize	int	set packet size (from 0 to INT_MAX) (default 0)
fflags	flags	FFmpeg fflags option. (default autobsf) Supported values: `flush_packets`, `bitexact`, `autobsf`. `flush_packets`: reduce the latency by flushing out packets immediately `bitexact`: do not write random/volatile data `autobsf`: add needed bsfs automatically
fdebug	flags	print specific debug info (default 0) Supported values: `ts`, `id3v2`. `ts`: ts `id3v2`: id3v2
max_delay	int	maximum muxing or demuxing delay in microseconds (from -1 to INT_MAX) (default -1)
start_time_realtime	string	wall-clock time when stream begins (PTS==0) (from I64_MIN to I64_MAX) (default I64_MIN)
audio_preload	int	microseconds by which audio packets should be interleaved earlier (from 0 to 2.14748e+09) (default 0)
chunk_duration	int	microseconds for each chunk (from 0 to 2.14748e+09) (default 0)
chunk_size	int	size in bytes for each chunk (from 0 to 2.14748e+09) (default 0)
flush_packets	int	enable flushing of the I/O context after each packet (from -1 to 1) (default -1)
metadata_header_padding	int	set number of bytes to be written as padding in a metadata header (from -1 to INT_MAX) (default -1)
output_ts_offset	string	set output timestamp offset (default 0)
max_interleave_delta	string	maximum buffering duration for interleaving (from 0 to I64_MAX) (default 10000000)
f_strict	option	how strictly to follow the standards (deprecated; use strict, save via avconv) (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
strict	option	how strictly to follow the standards (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
avoid_negative_ts	option	shift timestamps so they start at 0 (from -1 to 2) (default auto) Supported values: `auto`, `disabled`, `make_non_negative`, `make_zero`. `auto`: -1: enabled when required by target format `disabled`: 0: do not change timestamps `make_non_negative`: 1: shift timestamps so they are non negative `make_zero`: 2: shift timestamps so they start at 0

Video codecs

AV1 (FFmpeg VPL-MSDK, HW)
H.264 AVC (AMD AMF, HW)
H.264 AVC (Cisco OpenH264, SW)
H.264 AVC (FFmpeg VPL-MSDK, HW)
H.264 AVC (Intel QuickSync, SW)
H.264 AVC (Intel QuickSync, HW)
H.264 AVC (libx264, SW)
H.264 AVC (NVIDIA NVENC, HW)
H.265 HEVC (AMD AMF, HW)
H.265 HEVC (FFmpeg VPL-MSDK, HW)
H.265 HEVC (Intel QuickSync, HW)
H.265 HEVC (NVIDIA NVENC, HW)
H.265 HEVC (x265, SW)
Direct Stream Copy (No Re-Encoding)
No Video (Disabled)

Audio codecs

AAC (Advanced Audio Coding)
Direct Stream Copy (No Re-Encoding)

Image Sequence (Still Frames)

Configuration Parameter: image2

Extensions: dpx,png,jpg,tiff,tga,j2c

Additional attributes

Name	Type	Default	Description
create_folder	bool	true	Create folder for image sequence

Video codecs

DPX (Digital Picture eXchange, SW)
MJPEG (Motion JPEG, SW)
PNG (Image Sequence, SW)

Audio codecs

WAV (Wave Audio File)
No Audio (Disabled)

Video codec attributes

MJPEG (Motion JPEG, SW)

Name	Type	Description
huffman	option	Huffman table strategy (from 0 to 1) (default optimal) Supported values: `default`, `optimal`. `default`: 0: default `optimal`: 1: optimal
force_duplicated_matrix	option_fixed	Always write luma and chroma matrix for mjpeg, useful for rtp streaming. (default false) Supported values: `false`, `true`.
mpv_flags	flags	Flags common for all mpegvideo-based encoders. (default 0) Supported values: `skip_rd`, `strict_gop`, `qp_rd`, `cbp_rd`, `naq`. `skip_rd`: RD optimal MB level residual skipping `strict_gop`: Strictly enforce gop size `qp_rd`: Use rate distortion optimization for qp selection `cbp_rd`: use rate distortion optimization for CBP `naq`: normalize adaptive quantization
luma_elim_threshold	int	single coefficient elimination threshold for luminance (negative values also consider dc coefficient) (from INT_MIN to INT_MAX) (default 0)
chroma_elim_threshold	int	single coefficient elimination threshold for chrominance (negative values also consider dc coefficient) (from INT_MIN to INT_MAX) (default 0)
quantizer_noise_shaping	int	FFmpeg quantizer_noise_shaping option. (from 0 to INT_MAX) (default 0)
error_rate	int	Simulate errors in the bitstream to test error concealment. (from 0 to INT_MAX) (default 0)
qsquish	double	how to keep quantizer between qmin and qmax (0 = clip, 1 = use differentiable function) (from 0 to 99) (default 0)
rc_qmod_amp	double	experimental quantizer modulation (from -FLT_MAX to FLT_MAX) (default 0)
rc_qmod_freq	int	experimental quantizer modulation (from INT_MIN to INT_MAX) (default 0)
rc_eq	string	Set rate control equation. When computing the expression, besides the standard functions defined in the section 'Expression Evaluation', the following functions are available: bits2qp(bits), qp2bits(qp). Also the following constants are available: iTex pTex tex mv fCode iCount mcVar var isI isP isB avgQP qComp avgIITex avgPITex avgPPTex avgBPTex avgTex.
rc_init_cplx	double	initial complexity for 1-pass encoding (from -FLT_MAX to FLT_MAX) (default 0)
rc_buf_aggressivity	double	currently useless (from -FLT_MAX to FLT_MAX) (default 1)
border_mask	double	increase the quantizer for macroblocks close to borders (from -FLT_MAX to FLT_MAX) (default 0)
lmin	int	minimum Lagrange factor (VBR) (from 0 to INT_MAX) (default 236)
lmax	int	maximum Lagrange factor (VBR) (from 0 to INT_MAX) (default 3658)
skip_threshold	int	Frame skip threshold (from INT_MIN to INT_MAX) (default 0)
skip_factor	int	Frame skip factor (from INT_MIN to INT_MAX) (default 0)
skip_exp	int	Frame skip exponent (from INT_MIN to INT_MAX) (default 0)
skip_cmp	option	Frame skip compare function (from INT_MIN to INT_MAX) (default dctmax) Supported values: `sad`, `sse`, `satd`, `dct`, `psnr`, `bit`, `rd`, `zero`, `vsad`, `vsse`, `nsse`, `dct264`, `dctmax`, `chroma`, `msad`. `sad`: 0: Sum of absolute differences, fast `sse`: 1: Sum of squared errors `satd`: 2: Sum of absolute Hadamard transformed differences `dct`: 3: Sum of absolute DCT transformed differences `psnr`: 4: Sum of squared quantization errors, low quality `bit`: 5: Number of bits needed for the block `rd`: 6: Rate distortion optimal, slow `zero`: 7: Zero `vsad`: 8: Sum of absolute vertical differences `vsse`: 9: Sum of squared vertical differences `nsse`: 10: Noise preserving sum of squared differences `dct264`: 14: dct264 `dctmax`: 13: dctmax `chroma`: 256: chroma `msad`: 15: Sum of absolute differences, median predicted
noise_reduction	int	Noise reduction (from INT_MIN to INT_MAX) (default 0)
ps	int	RTP payload size in bytes (from INT_MIN to INT_MAX) (default 0)
global_quality	int	MJPEG quantizer in FFmpeg lambda units (quantizer multiplied by 118). Requires flags=+qscale. (from 118 to 3658)
flags	flags	Set qscale to use global_quality. Supported values: `qscale`, `global_header`, `bitexact`. `global_header`: global_header `bitexact`: bitexact

PNG (Image Sequence, SW)

Name	Type	Description
dpi	int	Set image resolution (in dots per inch) (from 0 to 65536) (default 0)
dpm	int	Set image resolution (in dots per meter) (from 0 to 65536) (default 0)
pred	option	Prediction method (from 0 to 5) (default paeth) Supported values: `none`, `sub`, `up`, `avg`, `paeth`, `mixed`. `none`: 0: none `sub`: 1: sub `up`: 2: up `avg`: 3: avg `paeth`: 4: paeth `mixed`: 5: mixed
compression_level	int	PNG/zlib compression level: -1 automatic, 0 uncompressed, 9 maximum compression. (from -1 to 9)

Audio codec attributes

WAV (Wave Audio File)

Name	Type	Default	Description
wav_path	string		MWriter only (legacy FFmpeg encoder): target WAV file; by default the image sequence name with the .wav extension

MKV (Matroska)

Configuration Parameter: matroska

Extensions: mkv

Additional attributes

Name	Type	Default	Description
split_channels	option_fixed	0	Split the overall audio channel into individual audio tracks, where each track contains a specific number of channels specified by the split_channels property. For example, if you record an input source with 12 audio channels and split_channels='4', you will get 3 audio tracks, each containing 4 audio channels Supported values: `0`, `1`, `2`, `4`, `6`, `8`.
scc_capture	option_fixed	true	Capture SCC Closed Captioning Supported values: `true`, `false`.
anc_capture	option_fixed	false	Capture ANC Closed Captioning Supported values: `true`, `false`.
embed_cc	bool	false	Enable embedding Closed Captions (ATSC) into elementary video stream
raw_video	string		MWriter only (legacy FFmpeg encoder): also write the encoded video stream to this file path
raw_audio	string		MWriter only (legacy FFmpeg encoder): also write the encoded audio stream of track 0 to this file path; raw_audio.N for track N
ignore_pts	option_fixed		MWriter only (legacy FFmpeg encoder): number video frames by a frame counter instead of the sample times Supported values: `false`, `true`.
reserve_index_space	int	0	Reserve a given amount of space (in bytes) at the beginning of the file for the index (cues) Range: minimum 0.0; maximum 2147483647.
cluster_size_limit	int	-1	Store at most the provided amount of bytes in a cluster. If not specified, the limit is set automatically to a sensible hardcoded fixed value Range: minimum -1.0; maximum 2147483647.
cluster_time_limit	int	-1	Store at most the provided number of milliseconds in a cluster. If not specified, the limit is set automatically to a sensible hardcoded fixed value Range: minimum -1.0.
dash	option_fixed		Create a WebM file conforming to WebM DASH specification. By default it is set to false Supported values: `false`, `true`.
dash_track_number	int	1	Track number for the DASH stream. By default it is set to 1 Range: minimum 1; maximum 2147483647.
live	option_fixed		Write files assuming it is a live stream. By default it is set to false Supported values: `false`, `true`.
allow_raw_vfw	option_fixed		Allow raw VFW mode. By default it is set to false Supported values: `false`, `true`.
write_crc32	option_fixed		Write a CRC32 element inside every Level 1 element. By default it is set to true. This option is ignored for WebM Supported values: `false`, `true`.
cues_to_front	option_fixed		move Cues (the index) to the front by shifting data if necessary (default false) Supported values: `false`, `true`.
flipped_raw_rgb	option_fixed		store raw RGB bitmaps in VFW mode in bottom-up mode (default false) Supported values: `false`, `true`.
default_mode	option		control how a track's FlagDefault is inferred (from 0 to 2) (default passthrough) Supported values: `infer`, `infer_no_subs`, `passthrough`. `infer`: 0: for each track type, mark each track of disposition default as default; if none exists, mark the first track as default `infer_no_subs`: 1: for each track type, mark each track of disposition default as default; for audio and video: if none exists, mark the first track as default `passthrough`: 2: use the disposition flag as-is
packetsize	int		set packet size (from 0 to INT_MAX) (default 0)
fflags	flags		FFmpeg fflags option. (default autobsf) Supported values: `flush_packets`, `bitexact`, `autobsf`. `flush_packets`: reduce the latency by flushing out packets immediately `bitexact`: do not write random/volatile data `autobsf`: add needed bsfs automatically
fdebug	flags		print specific debug info (default 0) Supported values: `ts`, `id3v2`. `ts`: ts `id3v2`: id3v2
max_delay	int		maximum muxing or demuxing delay in microseconds (from -1 to INT_MAX) (default -1)
start_time_realtime	string		wall-clock time when stream begins (PTS==0) (from I64_MIN to I64_MAX) (default I64_MIN)
audio_preload	int		microseconds by which audio packets should be interleaved earlier (from 0 to 2.14748e+09) (default 0)
chunk_duration	int		microseconds for each chunk (from 0 to 2.14748e+09) (default 0)
chunk_size	int		size in bytes for each chunk (from 0 to 2.14748e+09) (default 0)
flush_packets	int		enable flushing of the I/O context after each packet (from -1 to 1) (default -1)
metadata_header_padding	int		set number of bytes to be written as padding in a metadata header (from -1 to INT_MAX) (default -1)
output_ts_offset	string		set output timestamp offset (default 0)
max_interleave_delta	string		maximum buffering duration for interleaving (from 0 to I64_MAX) (default 10000000)
f_strict	option		how strictly to follow the standards (deprecated; use strict, save via avconv) (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
strict	option		how strictly to follow the standards (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
avoid_negative_ts	option		shift timestamps so they start at 0 (from -1 to 2) (default auto) Supported values: `auto`, `disabled`, `make_non_negative`, `make_zero`. `auto`: -1: enabled when required by target format `disabled`: 0: do not change timestamps `make_non_negative`: 1: shift timestamps so they are non negative `make_zero`: 2: shift timestamps so they start at 0

Video codecs

Default format codec
AV1 (FFmpeg VPL-MSDK, HW)
AV1 (NVIDIA NVENC, HW)
Apple ProRes (Legacy, SW)
Apple ProRes (iCodec Pro, SW)
DV / DVCPRO HD (SW)
FFV1 (Lossless, SW)
FLV / Sorenson Spark (H.263, SW)
H.264 AVC (AMD AMF, HW)
H.264 AVC (Cisco OpenH264, SW)
H.264 AVC (FFmpeg VPL-MSDK, HW)
H.264 AVC (Intel QuickSync, SW)
H.264 AVC (Intel QuickSync, HW)
H.264 AVC (libx264, SW)
H.264 AVC (NVIDIA NVENC, HW)
H.264 AVC (NVIDIA NVENC Lossless, HW)
H.265 HEVC (AMD AMF, HW)
H.265 HEVC (FFmpeg VPL-MSDK, HW)
H.265 HEVC (Intel QuickSync, HW)
H.265 HEVC (NVIDIA NVENC, HW)
H.265 HEVC (NVIDIA NVENC Lossless, HW)
H.265 HEVC (x265, SW)
H.266 VVC (Fraunhofer VVenC, SW)
HuffYUV (Lossless, SW)
JPEG XS (SVT, SW)
MJPEG (Motion JPEG, SW)
MPEG-1 Video (SW)
MPEG-2 Video (SW)
MPEG-4 Part 2 Video (ASP, SW)
VP8 (Google, SW)
VP9 (Google, SW)
WMV8 (Windows Media Video 8, SW)
Direct Stream Copy (No Re-Encoding)
No Video (Disabled)

Audio codecs

AAC (Advanced Audio Coding)
AC-3 (Dolby Digital, Floating-Point)
AC-3 (Dolby Digital, Fixed-Point)
ALAC (Apple Lossless)
MP2 (MPEG Audio Layer 2)
PCM 16-bit Signed LE
PCM 24-bit Signed LE
PCM 32-bit Signed LE
Direct Stream Copy (No Re-Encoding)
No Audio (Disabled)

Video codec attributes

Default format codec

Name	Type	Default	Description
b	int	5M	Set video bitrate (in bits/s). Support unit prefixes such as K or M

MOV (QuickTime File Format)

Configuration Parameter: mov

Extensions: mov

Additional attributes

Name	Type	Default	Description
split_channels	option_fixed	0	Split the overall audio channel into individual audio tracks, where each track contains a specific number of channels specified by the split_channels property. For example, if you record an input source with 12 audio channels and split_channels='4', you will get 3 audio tracks, each containing 4 audio channels Supported values: `0`, `1`, `2`, `4`, `6`, `8`.
scc_capture	option_fixed	true	Capture SCC Closed Captioning Supported values: `true`, `false`.
anc_capture	option_fixed	false	Capture ANC Closed Captioning Supported values: `true`, `false`.
embed_cc	bool	false	Enable embedding Closed Captions (ATSC) into elementary video stream
raw_video	string		MWriter only (legacy FFmpeg encoder): also write the encoded video stream to this file path
raw_audio	string		MWriter only (legacy FFmpeg encoder): also write the encoded audio stream of track 0 to this file path; raw_audio.N for track N
start_timecode	option	auto	Set start timecode for encoding. Possible values are: auto (default), disabled, local_time or a custom string like "10:00:00:00" Supported values: `auto`, `disabled`, `local_time`.
ignore_pts	option_fixed		MWriter only (legacy FFmpeg encoder): number video frames by a frame counter instead of the sample times Supported values: `false`, `true`.
movflags	flags		MOV muxer flags Add RTP hint tracksMake the initial moov atom emptyStart a new fragment at each video keyframeFragment at every frameWrite separate moof/mdat atoms for each trackFlush fragments on caller requestsCreate a live smooth streaming feed (for pushing to a publishing point)Run a second pass to put the index (moov atom) at the beginning of the fileOmit the base data offset in tfhd atomsDisable Nero chapter atomSet the default-base-is-moof flag in tfhd atomsWrite DASH compatible fragmented MP4Signal that the next fragment is discontinuous from earlier onesDelay writing the initial moov until the first fragment is cut, or until the first fragment flushWrite a global sidx index at the start of the fileWrite colr atom (Experimental, may be renamed or changed, do not use from scripts)Write deprecated gama atomUse mdta atom for metadata.Skip writing the mfra/tfra/mfro trailer for fragmented filesUse negative CTS offsets (reducing the need for edit lists) Supported values: `rtphint`, `empty_moov`, `frag_keyframe`, `frag_every_frame`, `separate_moof`, `frag_custom`, `isml`, `faststart`, `omit_tfhd_offset`, `disable_chpl`, `default_base_moof`, `dash`, `frag_discont`, `delay_moov`, `global_sidx`, `write_colr`, `write_gama`, `use_metadata_tags`, `skip_trailer`, `negative_cts_offsets`, `cmaf`, `prefer_icc`, `skip_sidx`, `hybrid_fragmented`. `cmaf`: Write CMAF compatible fragmented MP4 `prefer_icc`: If writing colr atom prioritise usage of ICC profile if it exists in stream packet side data `skip_sidx`: Skip writing of sidx atom `hybrid_fragmented`: For recoverability, write a fragmented file that is converted to non-fragmented at the end.
moov_size	int	0	Reserves space for the moov atom at the beginning of the file instead of placing the moov atom at the end. If the space reserved is insufficient, muxing will fail Range: minimum 0.0; maximum 2147483647.
rtpflags	flags		RTP muxer flags Use MP4A-LATM packetization instead of MPEG4-GENERIC for AACUse RFC 2190 packetization instead of RFC 4629 for H.263Don't send RTCP sender reportsUse mode 0 for H.264 in RTPSend RTCP BYE packets when finishing Supported values: `latm`, `rfc2190`, `skip_rtcp`, `h264_mode0`, `send_bye`.
skip_iods	option_fixed		Skip writing iods atom Supported values: `false`, `true`.
iods_audio_profile	int	-1	Specify iods number for the audio profile atom (from -1 to 255), default is -1
iods_video_profile	int	-1	Specify iods number for the video profile atom (from -1 to 255), default is -1
frag_duration	int	0	Create fragments that are duration microseconds long Range: minimum 0.0; maximum 2147483647.
min_frag_duration	int	0	Do not create fragments that are shorter than duration microseconds long Range: minimum 0.0; maximum 2147483647.
frag_size	int	0	Create fragments that contain up to size bytes of payload data Range: minimum 0.0; maximum 2147483647.
ism_lookahead	int	0	Specify number of lookahead entries for ISM files (from 0 to 255), default is 0
video_track_timescale	int	0	Set the timescale used for video tracks. Range is 0 to INT_MAX. If set to 0, the timescale is automatically set based on the native stream time base. Default is 0
brand	string		Override major brand
use_editlist	option_fixed		Use edit list (default value is auto) Supported values: `auto`, `false`, `true`.
fragment_index	int	1	Fragment number of the next fragment Range: minimum 1.0; maximum 2147483647.
mov_gamma	double	0.000000	Specify gamma value for gama atom (as a decimal number from 0 to 10), default is 0.0, must be set together with + movflags
frag_interleave	int	0	Interleave samples within fragments (max number of consecutive samples, lower is tighter interleaving, but with more overhead. It is set to 0 by default Range: minimum 0.0; maximum 2147483647.
encryption_scheme	string		Configures the encryption scheme, allowed values are none, cenc-aes-ctr
encryption_key	string		Set the media encryption key in hexadecimal format
encryption_kid	string		Set the media encryption key identifier in hexadecimal format
use_stream_ids_as_track_ids	option_fixed		Use stream ids as track ids Supported values: `false`, `true`.
write_tmcd	option_fixed		Force or disable writing tmcd Supported values: `auto`, `false`, `true`.
display_rotation	double		Set video rotation metadata. Rotation is a decimal number specifying the amount in degree by which the video should be rotated counter-clockwise before being displayed
empty_hdlr_name	option_fixed		write zero-length name string in hdlr atoms within mdia and minf atoms (default false) Supported values: `false`, `true`.
movie_timescale	int		set movie timescale (from 0 to INT_MAX) (default 0)
write_btrt	option_fixed		force or disable writing btrt (default auto) Supported values: `auto`, `false`, `true`.
write_prft	option		Write producer reference time box with specified time source (from 0 to 2) (default 0) Supported values: `pts`, `wallclock`. `pts`: 2: pts `wallclock`: 1: wallclock
packetsize	int		set packet size (from 0 to INT_MAX) (default 0)
fflags	flags		FFmpeg fflags option. (default autobsf) Supported values: `flush_packets`, `bitexact`, `autobsf`. `flush_packets`: reduce the latency by flushing out packets immediately `bitexact`: do not write random/volatile data `autobsf`: add needed bsfs automatically
fdebug	flags		print specific debug info (default 0) Supported values: `ts`, `id3v2`. `ts`: ts `id3v2`: id3v2
max_delay	int		maximum muxing or demuxing delay in microseconds (from -1 to INT_MAX) (default -1)
start_time_realtime	string		wall-clock time when stream begins (PTS==0) (from I64_MIN to I64_MAX) (default I64_MIN)
audio_preload	int		microseconds by which audio packets should be interleaved earlier (from 0 to 2.14748e+09) (default 0)
chunk_duration	int		microseconds for each chunk (from 0 to 2.14748e+09) (default 0)
chunk_size	int		size in bytes for each chunk (from 0 to 2.14748e+09) (default 0)
flush_packets	int		enable flushing of the I/O context after each packet (from -1 to 1) (default -1)
metadata_header_padding	int		set number of bytes to be written as padding in a metadata header (from -1 to INT_MAX) (default -1)
output_ts_offset	string		set output timestamp offset (default 0)
max_interleave_delta	string		maximum buffering duration for interleaving (from 0 to I64_MAX) (default 10000000)
f_strict	option		how strictly to follow the standards (deprecated; use strict, save via avconv) (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
strict	option		how strictly to follow the standards (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
avoid_negative_ts	option		shift timestamps so they start at 0 (from -1 to 2) (default auto) Supported values: `auto`, `disabled`, `make_non_negative`, `make_zero`. `auto`: -1: enabled when required by target format `disabled`: 0: do not change timestamps `make_non_negative`: 1: shift timestamps so they are non negative `make_zero`: 2: shift timestamps so they start at 0

Video codecs

Default format codec
AV1 (FFmpeg VPL-MSDK, HW)
Apple ProRes (Legacy, SW)
Apple ProRes (iCodec Pro, SW)
DPX (Digital Picture eXchange, SW)
DV / DVCPRO HD (SW)
FFV1 (Lossless, SW)
FLV / Sorenson Spark (H.263, SW)
H.264 AVC (AMD AMF, HW)
H.264 AVC (Cisco OpenH264, SW)
H.264 AVC (FFmpeg VPL-MSDK, HW)
H.264 AVC (Intel QuickSync, SW)
H.264 AVC (Intel QuickSync, HW)
H.264 AVC (libx264, SW)
H.264 AVC (NVIDIA NVENC, HW)
H.264 AVC (NVIDIA NVENC Lossless, HW)
H.265 HEVC (AMD AMF, HW)
H.265 HEVC (FFmpeg VPL-MSDK, HW)
H.265 HEVC (Intel QuickSync, HW)
H.265 HEVC (NVIDIA NVENC, HW)
H.265 HEVC (NVIDIA NVENC Lossless, HW)
H.265 HEVC (x265, SW)
H.266 VVC (Fraunhofer VVenC, SW)
Hap (Vidvox, SW)
HuffYUV (Lossless, SW)
JPEG XS (SVT, SW)
MJPEG (Motion JPEG, SW)
MPEG-1 Video (SW)
MPEG-2 Video (SW)
MPEG-4 Part 2 Video (ASP, SW)
PNG (Image Sequence, SW)
QuickTime Animation (RLE, SW)
Uncompressed 4:2:2 8-bit (SW)
Uncompressed 4:2:2 10-bit (SW)
WMV8 (Windows Media Video 8, SW)
Direct Stream Copy (No Re-Encoding)
No Video (Disabled)

Audio codecs

Default format codec
AAC (Advanced Audio Coding)
AC-3 (Dolby Digital, Floating-Point)
AC-3 (Dolby Digital, Fixed-Point)
ADPCM IMA QuickTime
ADPCM Microsoft
ALAC (Apple Lossless)
E-AC-3 (Dolby Digital Plus)
MP2 (MPEG Audio Layer 2)
MP3 (LAME, MPEG Audio Layer 3)
Ogg Vorbis
PCM 16-bit Signed LE
PCM 24-bit Signed LE
PCM 32-bit Signed LE
PCM 32-bit Float LE
Direct Stream Copy (No Re-Encoding)
No Audio (Disabled)

Video codec attributes

Default format codec

Name	Type	Default	Description
b	int	5M	Set video bitrate (in bits/s). Support unit prefixes such as K or M

Audio codec attributes

Default format codec

Name	Type	Default	Description
b	int	128000	Set audio bitrate (in bits/s). Support unit prefixes such as K

MOV DNxHD (QuickTime with DNxHD)

Configuration Parameter: mov_dnxhd

Extensions: mov

Additional attributes

Name	Type	Default	Description
split_channels	option_fixed	0	Split the overall audio channel into individual audio tracks, where each track contains a specific number of channels specified by the split_channels property. For example, if you record an input source with 12 audio channels and split_channels='4', you will get 3 audio tracks, each containing 4 audio channels Supported values: `0`, `1`, `2`, `4`, `6`, `8`.
scc_capture	option_fixed	true	Capture SCC Closed Captioning Supported values: `true`, `false`.
anc_capture	option_fixed	false	Capture ANC Closed Captioning Supported values: `true`, `false`.
raw_video	string		MWriter only (legacy FFmpeg encoder): also write the encoded video stream to this file path
raw_audio	string		MWriter only (legacy FFmpeg encoder): also write the encoded audio stream of track 0 to this file path; raw_audio.N for track N
start_timecode	option	auto	Set start timecode for encoding. Possible values are: auto (default), disabled, local_time or a custom string like "10:00:00:00" Supported values: `auto`, `disabled`, `local_time`.
ignore_pts	option_fixed		MWriter only (legacy FFmpeg encoder): number video frames by a frame counter instead of the sample times Supported values: `false`, `true`.
movflags	flags		MOV muxer flags Fragment at video keyframesThis data is usually written at the end of the file, but it can be moved to the start for better playback by adding +faststart to the movflags Supported values: `frag_keyframe`, `faststart`, `cmaf`, `dash`, `default_base_moof`, `delay_moov`, `disable_chpl`, `empty_moov`, `frag_custom`, `frag_discont`, `frag_every_frame`, `global_sidx`, `isml`, `negative_cts_offsets`, `omit_tfhd_offset`, `prefer_icc`, `rtphint`, `separate_moof`, `skip_sidx`, `skip_trailer`, `use_metadata_tags`, `write_colr`, `write_gama`, `hybrid_fragmented`. `cmaf`: Write CMAF compatible fragmented MP4 `dash`: Write DASH compatible fragmented MP4 `default_base_moof`: Set the default-base-is-moof flag in tfhd atoms `delay_moov`: Delay writing the initial moov until the first fragment is cut, or until the first fragment flush `disable_chpl`: Disable Nero chapter atom `empty_moov`: Make the initial moov atom empty `frag_custom`: Flush fragments on caller requests `frag_discont`: Signal that the next fragment is discontinuous from earlier ones `frag_every_frame`: Fragment at every frame `global_sidx`: Write a global sidx index at the start of the file `isml`: Create a live smooth streaming feed (for pushing to a publishing point) `negative_cts_offsets`: Use negative CTS offsets (reducing the need for edit lists) `omit_tfhd_offset`: Omit the base data offset in tfhd atoms `prefer_icc`: If writing colr atom prioritise usage of ICC profile if it exists in stream packet side data `rtphint`: Add RTP hint tracks `separate_moof`: Write separate moof/mdat atoms for each track `skip_sidx`: Skip writing of sidx atom `skip_trailer`: Skip writing the mfra/tfra/mfro trailer for fragmented files `use_metadata_tags`: Use mdta atom for metadata. `write_colr`: Write colr atom even if the color info is unspecified (Experimental, may be renamed or changed, do not use from scripts) `write_gama`: Write deprecated gama atom `hybrid_fragmented`: For recoverability, write a fragmented file that is converted to non-fragmented at the end.
moov_size	int	0	Reserves space for the moov atom at the beginning of the file instead of placing the moov atom at the end. If the space reserved is insufficient, muxing will fail Range: minimum 0.0; maximum 2147483647.
skip_iods	int		Skip writing iods atom Range: minimum 0.0; maximum 1.0.
iods_audio_profile	int	-1	Specify iods number for the audio profile atom (from -1 to 255), default is -1
iods_video_profile	int	-1	Specify iods number for the video profile atom (from -1 to 255), default is -1
frag_duration	int	0	Create fragments that are duration microseconds long Range: minimum 0.0; maximum 2147483647.
min_frag_duration	int	0	Specify the minimum fragment duration (in microseconds) Range: minimum 0.0; maximum 2147483647.
frag_size	int	0	Create fragments that contain up to size bytes of payload data Range: minimum 0.0; maximum 2147483647.
display_rotation	double		Set video rotation metadata. Rotation is a decimal number specifying the amount in degree by which the video should be rotated counter-clockwise before being displayed
brand	string		Override major brand
empty_hdlr_name	option_fixed		write zero-length name string in hdlr atoms within mdia and minf atoms (default false) Supported values: `false`, `true`.
encryption_key	string		The media encryption key (hex)
encryption_kid	string		The media encryption key identifier (hex)
encryption_scheme	string		Configures the encryption scheme, allowed values are none, cenc-aes-ctr
frag_interleave	int		Interleave samples within fragments (max number of consecutive samples, lower is tighter interleaving, but with more overhead) (from 0 to INT_MAX) (default 0)
fragment_index	int		Fragment number of the next fragment. Range: minimum 1; maximum 2147483647.
ism_lookahead	int		Number of lookahead entries for ISM files (from 0 to 255) (default 0)
mov_gamma	double		gamma value for gama atom (from 0 to 10) (default 0)
movie_timescale	int		set movie timescale (from 0 to INT_MAX) (default 0)
rtpflags	flags		RTP muxer flags (default 0) Supported values: `latm`, `rfc2190`, `skip_rtcp`, `h264_mode0`, `send_bye`. `latm`: Use MP4A-LATM packetization instead of MPEG4-GENERIC for AAC `rfc2190`: Use RFC 2190 packetization instead of RFC 4629 for H.263 `skip_rtcp`: Don't send RTCP sender reports `h264_mode0`: Use mode 0 for H.264 in RTP `send_bye`: Send RTCP BYE packets when finishing
use_editlist	option_fixed		use edit list (default auto) Supported values: `auto`, `false`, `true`.
use_stream_ids_as_track_ids	option_fixed		use stream ids as track ids (default false) Supported values: `false`, `true`.
video_track_timescale	int		set timescale of all video tracks (from 0 to INT_MAX) (default 0)
write_btrt	option_fixed		force or disable writing btrt (default auto) Supported values: `auto`, `false`, `true`.
write_prft	option		Write producer reference time box with specified time source (from 0 to 2) (default 0) Supported values: `pts`, `wallclock`. `pts`: 2: pts `wallclock`: 1: wallclock
write_tmcd	option_fixed		force or disable writing tmcd (default auto) Supported values: `auto`, `false`, `true`.
packetsize	int		set packet size (from 0 to INT_MAX) (default 0)
fflags	flags		FFmpeg fflags option. (default autobsf) Supported values: `flush_packets`, `bitexact`, `autobsf`. `flush_packets`: reduce the latency by flushing out packets immediately `bitexact`: do not write random/volatile data `autobsf`: add needed bsfs automatically
fdebug	flags		print specific debug info (default 0) Supported values: `ts`, `id3v2`. `ts`: ts `id3v2`: id3v2
max_delay	int		maximum muxing or demuxing delay in microseconds (from -1 to INT_MAX) (default -1)
start_time_realtime	string		wall-clock time when stream begins (PTS==0) (from I64_MIN to I64_MAX) (default I64_MIN)
audio_preload	int		microseconds by which audio packets should be interleaved earlier (from 0 to 2.14748e+09) (default 0)
chunk_duration	int		microseconds for each chunk (from 0 to 2.14748e+09) (default 0)
chunk_size	int		size in bytes for each chunk (from 0 to 2.14748e+09) (default 0)
flush_packets	int		enable flushing of the I/O context after each packet (from -1 to 1) (default -1)
metadata_header_padding	int		set number of bytes to be written as padding in a metadata header (from -1 to INT_MAX) (default -1)
output_ts_offset	string		set output timestamp offset (default 0)
max_interleave_delta	string		maximum buffering duration for interleaving (from 0 to I64_MAX) (default 10000000)
f_strict	option		how strictly to follow the standards (deprecated; use strict, save via avconv) (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
strict	option		how strictly to follow the standards (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
avoid_negative_ts	option		shift timestamps so they start at 0 (from -1 to 2) (default auto) Supported values: `auto`, `disabled`, `make_non_negative`, `make_zero`. `auto`: -1: enabled when required by target format `disabled`: 0: do not change timestamps `make_non_negative`: 1: shift timestamps so they are non negative `make_zero`: 2: shift timestamps so they start at 0

Video codecs

DNxHD 1080 60p
DNxHD 1080 59p
DNxHD 1080 50p
DNxHD 1080 59i
DNxHD 1080 25p
DNxHD 1080 24p
DNxHD 1080 23p
DNxHD 1080 29p
DNxHD 720 59p
DNxHD 720 50p
DNxHR LB 4K_DCI 60p
DNxHR LB 4K_DCI 59p
DNxHR LB 4K_DCI 50p
DNxHR LB 4K_DCI 30p
DNxHR LB 4K_DCI 29p
DNxHR LB 4K_DCI 25p
DNxHR LB 4K_DCI 24p
DNxHR LB 4K_DCI 23p
DNxHR LB 4K_UHD 60p
DNxHR LB 4K_UHD 59p
DNxHR LB 4K_UHD 50p
DNxHR LB 4K_UHD 30p
DNxHR LB 4K_UHD 29p
DNxHR LB 4K_UHD 25p
DNxHR LB 4K_UHD 24p
DNxHR LB 4K_UHD 23p
DNxHR LB 2K_DCI 60p
DNxHR LB 2K_DCI 59p
DNxHR LB 2K_DCI 50p
DNxHR LB 2K_DCI 30p
DNxHR LB 2K_DCI 29p
DNxHR LB 2K_DCI 25p
DNxHR LB 2K_DCI 24p
DNxHR LB 2K_DCI 23p
DNxHR SQ 4K_DCI 60p
DNxHR SQ 4K_DCI 59p
DNxHR SQ 4K_DCI 50p
DNxHR SQ 4K_DCI 30p
DNxHR SQ 4K_DCI 29p
DNxHR SQ 4K_DCI 25p
DNxHR SQ 4K_DCI 24p
DNxHR SQ 4K_DCI 23p
DNxHR SQ 4K_UHD 60p
DNxHR SQ 4K_UHD 59p
DNxHR SQ 4K_UHD 50p
DNxHR SQ 4K_UHD 30p
DNxHR SQ 4K_UHD 29p
DNxHR SQ 4K_UHD 25p
DNxHR SQ 4K_UHD 24p
DNxHR SQ 4K_UHD 23p
DNxHR SQ 2K_DCI 60p
DNxHR SQ 2K_DCI 59p
DNxHR SQ 2K_DCI 50p
DNxHR SQ 2K_DCI 30p
DNxHR SQ 2K_DCI 29p
DNxHR SQ 2K_DCI 25p
DNxHR SQ 2K_DCI 24p
DNxHR SQ 2K_DCI 23p
DNxHR HQ 4K_DCI 60p
DNxHR HQ 4K_DCI 59p
DNxHR HQ 4K_DCI 50p
DNxHR HQ 4K_DCI 30p
DNxHR HQ 4K_DCI 29p
DNxHR HQ 4K_DCI 25p
DNxHR HQ 4K_DCI 24p
DNxHR HQ 4K_DCI 23p
DNxHR HQ 4K_UHD 60p
DNxHR HQ 4K_UHD 59p
DNxHR HQ 4K_UHD 50p
DNxHR HQ 4K_UHD 30p
DNxHR HQ 4K_UHD 29p
DNxHR HQ 4K_UHD 25p
DNxHR HQ 4K_UHD 24p
DNxHR HQ 4K_UHD 23p
DNxHR HQ 2K_DCI 60p
DNxHR HQ 2K_DCI 59p
DNxHR HQ 2K_DCI 50p
DNxHR HQ 2K_DCI 30p
DNxHR HQ 2K_DCI 29p
DNxHR HQ 2K_DCI 25p
DNxHR HQ 2K_DCI 24p
DNxHR HQ 2K_DCI 23p
No Video

Audio codecs

Default format codec
AAC (Advanced Audio Coding)
AC-3 (Dolby Digital, Floating-Point)
AC-3 (Dolby Digital, Fixed-Point)
ADPCM IMA QuickTime
ADPCM Microsoft
ALAC (Apple Lossless)
E-AC-3 (Dolby Digital Plus)
MP2 (MPEG Audio Layer 2)
MP3 (LAME, MPEG Audio Layer 3)
Ogg Vorbis
PCM 16-bit Signed LE
PCM 24-bit Signed LE
PCM 32-bit Signed LE
PCM 32-bit Float LE
No Audio (Disabled)

Video codec attributes

DNxHD 1080 60p

Name	Type	Default	Description
b	option_fixed	440M	Set bitrate (in bits/s). Possible values: 440M, 290M, 90M Supported values: `440M`, `290M`, `90M`.

DNxHD 1080 59p

Name	Type	Default	Description
b	option_fixed	440M	Set bitrate (in bits/s). Possible values: 440M, 290M, 90M Supported values: `440M`, `290M`, `90M`.

DNxHD 1080 50p

Name	Type	Default	Description
b	option_fixed	365M	Set bitrate (in bits/s). Possible values: 365M, 240M, 75M Supported values: `365M`, `240M`, `75M`.

DNxHD 1080 59i

Name	Type	Default	Description
b	option_fixed	220M	Set bitrate (in bits/s). Possible values: 220M, 145M, 185M, 120M Supported values: `220M`, `145M`, `185M`, `120M`.

DNxHD 1080 25p

Name	Type	Default	Description
b	option_fixed	185M	Set bitrate (in bits/s). Possible values: 185M, 120M, 36M Supported values: `185M`, `120M`, `36M`.

DNxHD 1080 24p

Name	Type	Default	Description
b	option_fixed	175M	Set bitrate (in bits/s). Possible values: 175M, 115M, 36M Supported values: `175M`, `115M`, `36M`.

DNxHD 1080 23p

Name	Type	Default	Description
b	option_fixed	175M	Set bitrate (in bits/s). Possible values: 175M, 115M, 36M Supported values: `175M`, `115M`, `36M`.

DNxHD 1080 29p

Name	Type	Default	Description
b	option_fixed	220M	Set bitrate (in bits/s). Possible values: 220M, 145M, 45M Supported values: `220M`, `145M`, `45M`.

DNxHD 720 59p

Name	Type	Default	Description
b	option_fixed	220M	Set bitrate (in bits/s). Possible values: 220M, 145M Supported values: `220M`, `145M`.

DNxHD 720 50p

Name	Type	Default	Description
b	option_fixed	60M	Set bitrate (in bits/s). Possible values: 90M, 60M Supported values: `90M`, `60M`.

DNxHR LB 4K_DCI 60p

Name	Type	Default	Description
b	option_fixed	383M	Set bitrate (in bits/s). Possible values: 383M, 95M, 24M Supported values: `383M`, `95M`, `24M`.

DNxHR LB 4K_DCI 59p

Name	Type	Default	Description
b	option_fixed	383M	Set bitrate (in bits/s). Possible values: 383M, 95M, 24M Supported values: `383M`, `95M`, `24M`.

DNxHR LB 4K_DCI 50p

Name	Type	Default	Description
b	option_fixed	319M	Set bitrate (in bits/s). Possible values: 319M, 79M, 20M Supported values: `319M`, `79M`, `20M`.

DNxHR LB 4K_DCI 30p

Name	Type	Default	Description
b	option_fixed	192M	Set bitrate (in bits/s). Possible values: 192M, 48M, 12M Supported values: `192M`, `48M`, `12M`.

DNxHR LB 4K_DCI 29p

Name	Type	Default	Description
b	option_fixed	191M	Set bitrate (in bits/s). Possible values: 191M, 47M, 12M Supported values: `191M`, `47M`, `12M`.

DNxHR LB 4K_DCI 25p

Name	Type	Default	Description
b	option_fixed	160M	Set bitrate (in bits/s). Possible values: 160M, 40M, 10M Supported values: `160M`, `40M`, `10M`.

DNxHR LB 4K_DCI 24p

Name	Type	Default	Description
b	option_fixed	153M	Set bitrate (in bits/s). Possible values: 153M, 38M, 9M Supported values: `153M`, `38M`, `9M`.

DNxHR LB 4K_DCI 23p

Name	Type	Default	Description
b	option_fixed	153M	Set bitrate (in bits/s). Possible values: 153M, 38M, 9M Supported values: `153M`, `38M`, `9M`.

DNxHR LB 4K_UHD 60p

Name	Type	Default	Description
b	option_fixed	359M	Set bitrate (in bits/s). Possible values: 359M, 74M, 22M Supported values: `359M`, `74M`, `22M`.

DNxHR LB 4K_UHD 59p

Name	Type	Default	Description
b	option_fixed	359M	Set bitrate (in bits/s). Possible values: 359M, 74M, 22M Supported values: `359M`, `74M`, `22M`.

DNxHR LB 4K_UHD 50p

Name	Type	Default	Description
b	option_fixed	299M	Set bitrate (in bits/s). Possible values: 299M, 74M, 18M Supported values: `299M`, `74M`, `18M`.

DNxHR LB 4K_UHD 30p

Name	Type	Default	Description
b	option_fixed	180M	Set bitrate (in bits/s). Possible values: 180M, 45M, 11M Supported values: `180M`, `45M`, `11M`.

DNxHR LB 4K_UHD 29p

Name	Type	Default	Description
b	option_fixed	179M	Set bitrate (in bits/s). Possible values: 179M, 44M, 11M Supported values: `179M`, `44M`, `11M`.

DNxHR LB 4K_UHD 25p

Name	Type	Default	Description
b	option_fixed	150M	Set bitrate (in bits/s). Possible values: 150M, 37M, 9M Supported values: `150M`, `37M`, `9M`.

DNxHR LB 4K_UHD 24p

Name	Type	Default	Description
b	option_fixed	144M	Set bitrate (in bits/s). Possible values: 144M, 36M, 9M Supported values: `144M`, `36M`, `9M`.

DNxHR LB 4K_UHD 23p

Name	Type	Default	Description
b	option_fixed	143M	Set bitrate (in bits/s). Possible values: 143M, 35M, 9M Supported values: `143M`, `35M`, `9M`.

DNxHR LB 2K_DCI 60p

Name	Type	Default	Description
b	option_fixed	96M	Set bitrate (in bits/s). Possible values: 96M, 24M, 6M Supported values: `96M`, `24M`, `6M`.

DNxHR LB 2K_DCI 59p

Name	Type	Default	Description
b	option_fixed	96M	Set bitrate (in bits/s). Possible values: 96M, 24M, 6M Supported values: `96M`, `24M`, `6M`.

DNxHR LB 2K_DCI 50p

Name	Type	Default	Description
b	option_fixed	80M	Set bitrate (in bits/s). Possible values: 80M, 20M, 5M Supported values: `80M`, `20M`, `5M`.

DNxHR LB 2K_DCI 30p

Name	Type	Default	Description
b	option_fixed	48M	Set bitrate (in bits/s). Possible values: 48M, 12M, 3M Supported values: `48M`, `12M`, `3M`.

DNxHR LB 2K_DCI 29p

Name	Type	Default	Description
b	option_fixed	48M	Set bitrate (in bits/s). Possible values: 48M, 12M, 3M Supported values: `48M`, `12M`, `3M`.

DNxHR LB 2K_DCI 25p

Name	Type	Default	Description
b	option_fixed	40M	Set bitrate (in bits/s). Possible values: 40M, 10M, 2M Supported values: `40M`, `10M`, `2M`.

DNxHR LB 2K_DCI 24p

Name	Type	Default	Description
b	option_fixed	39M	Set bitrate (in bits/s). Possible values: 39M, 9M, 2M Supported values: `39M`, `9M`, `2M`.

DNxHR LB 2K_DCI 23p

Name	Type	Default	Description
b	option_fixed	39M	Set bitrate (in bits/s). Possible values: 39M, 9M, 2M Supported values: `39M`, `9M`, `2M`.

Audio codec attributes

Default format codec

Name	Type	Default	Description
b	int	128000	Set audio bitrate (in bits/s). Support unit prefixes such as K

MP3 (LAME, MPEG Audio Layer 3)

Configuration Parameter: mp3

Extensions: mp3

Additional attributes

Name	Type	Default	Description
id3v2_version	option_fixed	4	Select ID3v2 version: 0 disables the tag, 3 writes ID3v2.3, 4 writes ID3v2.4. Versions 1 and 2 are not supported. Supported values: `0`, `3`, `4`. Range: minimum 0; maximum 4.
write_id3v1	int	0	Enable ID3v1 writing. ID3v1 tags are written in UTF-8 which may not be supported by most software Range: minimum 0.0; maximum 1.0.
write_xing	option_fixed		Write the Xing header containing file duration. (default true) Supported values: `false`, `true`.
packetsize	int		set packet size (from 0 to INT_MAX) (default 0)
fflags	flags		FFmpeg fflags option. (default autobsf) Supported values: `flush_packets`, `bitexact`, `autobsf`. `flush_packets`: reduce the latency by flushing out packets immediately `bitexact`: do not write random/volatile data `autobsf`: add needed bsfs automatically
fdebug	flags		print specific debug info (default 0) Supported values: `ts`, `id3v2`. `ts`: ts `id3v2`: id3v2
max_delay	int		maximum muxing or demuxing delay in microseconds (from -1 to INT_MAX) (default -1)
start_time_realtime	string		wall-clock time when stream begins (PTS==0) (from I64_MIN to I64_MAX) (default I64_MIN)
audio_preload	int		microseconds by which audio packets should be interleaved earlier (from 0 to 2.14748e+09) (default 0)
chunk_duration	int		microseconds for each chunk (from 0 to 2.14748e+09) (default 0)
chunk_size	int		size in bytes for each chunk (from 0 to 2.14748e+09) (default 0)
flush_packets	int		enable flushing of the I/O context after each packet (from -1 to 1) (default -1)
metadata_header_padding	int		set number of bytes to be written as padding in a metadata header (from -1 to INT_MAX) (default -1)
output_ts_offset	string		set output timestamp offset (default 0)
max_interleave_delta	string		maximum buffering duration for interleaving (from 0 to I64_MAX) (default 10000000)
f_strict	option		how strictly to follow the standards (deprecated; use strict, save via avconv) (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
strict	option		how strictly to follow the standards (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
avoid_negative_ts	option		shift timestamps so they start at 0 (from -1 to 2) (default auto) Supported values: `auto`, `disabled`, `make_non_negative`, `make_zero`. `auto`: -1: enabled when required by target format `disabled`: 0: do not change timestamps `make_non_negative`: 1: shift timestamps so they are non negative `make_zero`: 2: shift timestamps so they start at 0

Video codecs

No Video (Disabled)

Audio codecs

MP3 (LAME, MPEG Audio Layer 3)
Direct Stream Copy (No Re-Encoding)

MP4 (MPEG-4 Part 14)

Configuration Parameter: mp4

Extensions: mp4

Additional attributes

Name	Type	Default	Description
split_channels	option_fixed	0	Split the overall audio channel into individual audio tracks, where each track contains a specific number of channels specified by the split_channels property. For example, if you record an input source with 12 audio channels and split_channels='4', you will get 3 audio tracks, each containing 4 audio channels Supported values: `0`, `1`, `2`, `4`, `6`, `8`.
scc_capture	option_fixed	true	Capture SCC Closed Captioning Supported values: `true`, `false`.
anc_capture	option_fixed	false	Capture ANC Closed Captioning Supported values: `true`, `false`.
embed_cc	bool	false	Enable embedding Closed Captions (ATSC) into elementary video stream
embed_tc	bool	false	Enable embedding Time Code into elementary video stream (for H.264 video only)
raw_video	string		MWriter only (legacy FFmpeg encoder): also write the encoded video stream to this file path
raw_audio	string		MWriter only (legacy FFmpeg encoder): also write the encoded audio stream of track 0 to this file path; raw_audio.N for track N
ignore_pts	option_fixed		MWriter only (legacy FFmpeg encoder): number video frames by a frame counter instead of the sample times Supported values: `false`, `true`.
movflags	flags		MOV muxer flags Add RTP hint tracksMake the initial moov atom emptyFragment at video keyframesFragment at every frameWrite separate moof/mdat atoms for each trackFlush fragments on caller requestsCreate a live smooth streaming feed (for pushing to a publishing point)Run a second pass to put the index (moov atom) at the beginning of the fileOmit the base data offset in tfhd atomsDisable Nero chapter atomSet the default-base-is-moof flag in tfhd atomsWrite DASH compatible fragmented MP4Signal that the next fragment is discontinuous from earlier onesDelay writing the initial moov until the first fragment is cut, or until the first fragment flushWrite a global sidx index at the start of the fileWrite colr atom (Experimental, may be renamed or changed, do not use from scripts)Write deprecated gama atomUse mdta atom for metadata.Skip writing the mfra/tfra/mfro trailer for fragmented filesUse negative CTS offsets (reducing the need for edit lists) Supported values: `rtphint`, `empty_moov`, `frag_keyframe`, `frag_every_frame`, `separate_moof`, `frag_custom`, `isml`, `faststart`, `omit_tfhd_offset`, `disable_chpl`, `default_base_moof`, `dash`, `frag_discont`, `delay_moov`, `global_sidx`, `write_colr`, `write_gama`, `use_metadata_tags`, `skip_trailer`, `negative_cts_offsets`, `cmaf`, `prefer_icc`, `skip_sidx`, `hybrid_fragmented`. `cmaf`: Write CMAF compatible fragmented MP4 `prefer_icc`: If writing colr atom prioritise usage of ICC profile if it exists in stream packet side data `skip_sidx`: Skip writing of sidx atom `hybrid_fragmented`: For recoverability, write a fragmented file that is converted to non-fragmented at the end.
moov_size	int		Reserves space for the moov atom at the beginning of the file instead of placing the moov atom at the end. If the space reserved is insufficient, muxing will fail Range: minimum 0.0; maximum 2147483647.
rtpflags	flags		RTP muxer flags Use MP4A-LATM packetization instead of MPEG4-GENERIC for AACUse RFC 2190 packetization instead of RFC 4629 for H.263Don't send RTCP sender reportsUse mode 0 for H.264 in RTPSend RTCP BYE packets when finishing Supported values: `latm`, `rfc2190`, `skip_rtcp`, `h264_mode0`, `send_bye`.
skip_iods	option_fixed		Skip writing iods atom Supported values: `false`, `true`.
iods_audio_profile	int	-1	Specify iods number for the audio profile atom (from -1 to 255), default is -1
iods_video_profile	int	-1	Specify iods number for the video profile atom (from -1 to 255), default is -1
frag_duration	int	0	Create fragments that are duration microseconds long Range: minimum 0.0; maximum 2147483647.
min_frag_duration	int	0	Do not create fragments that are shorter than duration microseconds long Range: minimum 0.0; maximum 2147483647.
frag_size	int	0	Create fragments that contain up to size bytes of payload data Range: minimum 0.0; maximum 2147483647.
ism_lookahead	int	0	Specify number of lookahead entries for ISM files (from 0 to 255), default is 0
video_track_timescale	int	0	Set the timescale used for video tracks. Range is 0 to INT_MAX. If set to 0, the timescale is automatically set based on the native stream time base. Default is 0
brand	string		Override major brand
use_editlist	option_fixed		Use edit list (default value is auto) Supported values: `auto`, `false`, `true`.
fragment_index	int	1	Fragment number of the next fragment. Range: minimum 1.0; maximum 2147483647.
mov_gamma	double	0.0	gamma value for gama atom Range: minimum 0.0; maximum 10.0.
frag_interleave	int	0	Interleave samples within fragments (max number of consecutive samples, lower is tighter interleaving, but with more overhead) Range: minimum 0.0; maximum 2147483647.
encryption_scheme	string		Configures the encryption scheme, allowed values are none, cenc-aes-ctr
encryption_key	string		Set the media encryption key in hexadecimal format
encryption_kid	string		Set the media encryption key identifier in hexadecimal format
use_stream_ids_as_track_ids	option_fixed		Use stream ids as track ids Supported values: `false`, `true`.
write_tmcd	option_fixed		Specify on to force writing a timecode track, off to disable it and auto to write a timecode track only for mov and mp4 output (default) Supported values: `auto`, `false`, `true`.
display_rotation	double		Set video rotation metadata. Rotation is a decimal number specifying the amount in degree by which the video should be rotated counter-clockwise before being displayed
empty_hdlr_name	option_fixed		write zero-length name string in hdlr atoms within mdia and minf atoms (default false) Supported values: `false`, `true`.
movie_timescale	int		set movie timescale (from 0 to INT_MAX) (default 0)
write_btrt	option_fixed		force or disable writing btrt (default auto) Supported values: `auto`, `false`, `true`.
write_prft	option		Write producer reference time box with specified time source (from 0 to 2) (default 0) Supported values: `pts`, `wallclock`. `pts`: 2: pts `wallclock`: 1: wallclock
packetsize	int		set packet size (from 0 to INT_MAX) (default 0)
fflags	flags		FFmpeg fflags option. (default autobsf) Supported values: `flush_packets`, `bitexact`, `autobsf`. `flush_packets`: reduce the latency by flushing out packets immediately `bitexact`: do not write random/volatile data `autobsf`: add needed bsfs automatically
fdebug	flags		print specific debug info (default 0) Supported values: `ts`, `id3v2`. `ts`: ts `id3v2`: id3v2
max_delay	int		maximum muxing or demuxing delay in microseconds (from -1 to INT_MAX) (default -1)
start_time_realtime	string		wall-clock time when stream begins (PTS==0) (from I64_MIN to I64_MAX) (default I64_MIN)
audio_preload	int		microseconds by which audio packets should be interleaved earlier (from 0 to 2.14748e+09) (default 0)
chunk_duration	int		microseconds for each chunk (from 0 to 2.14748e+09) (default 0)
chunk_size	int		size in bytes for each chunk (from 0 to 2.14748e+09) (default 0)
flush_packets	int		enable flushing of the I/O context after each packet (from -1 to 1) (default -1)
metadata_header_padding	int		set number of bytes to be written as padding in a metadata header (from -1 to INT_MAX) (default -1)
output_ts_offset	string		set output timestamp offset (default 0)
max_interleave_delta	string		maximum buffering duration for interleaving (from 0 to I64_MAX) (default 10000000)
f_strict	option		how strictly to follow the standards (deprecated; use strict, save via avconv) (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
strict	option		how strictly to follow the standards (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
avoid_negative_ts	option		shift timestamps so they start at 0 (from -1 to 2) (default auto) Supported values: `auto`, `disabled`, `make_non_negative`, `make_zero`. `auto`: -1: enabled when required by target format `disabled`: 0: do not change timestamps `make_non_negative`: 1: shift timestamps so they are non negative `make_zero`: 2: shift timestamps so they start at 0

Video codecs

Default format codec
AV1 (FFmpeg VPL-MSDK, HW)
AV1 (NVIDIA NVENC, HW)
H.264 AVC (AMD AMF, HW)
H.264 AVC (Cisco OpenH264, SW)
H.264 AVC (FFmpeg VPL-MSDK, HW)
H.264 AVC (Intel QuickSync, SW)
H.264 AVC (Intel QuickSync, HW)
H.264 AVC (libx264, SW)
H.264 AVC (NVIDIA NVENC, HW)
H.264 AVC (NVIDIA NVENC Lossless, HW)
H.265 HEVC (AMD AMF, HW)
H.265 HEVC (FFmpeg VPL-MSDK, HW)
H.265 HEVC (Intel QuickSync, HW)
H.265 HEVC (NVIDIA NVENC, HW)
H.265 HEVC (NVIDIA NVENC Lossless, HW)
H.265 HEVC (x265, SW)
H.266 VVC (Fraunhofer VVenC, SW)
JPEG XS (SVT, SW)
MJPEG (Motion JPEG, SW)
MPEG-1 Video (SW)
MPEG-2 Video (SW)
MPEG-4 Part 2 Video (ASP, SW)
Direct Stream Copy (No Re-Encoding)
No Video (Disabled)

Audio codecs

Default format codec
AAC (Advanced Audio Coding)
AC-3 (Dolby Digital, Floating-Point)
AC-3 (Dolby Digital, Fixed-Point)
MP2 (MPEG Audio Layer 2)
MP3 (LAME, MPEG Audio Layer 3)
Ogg Vorbis
Direct Stream Copy (No Re-Encoding)
No Audio (Disabled)

Video codec attributes

Default format codec

Name	Type	Default	Description
b	int	5M	Set video bitrate (in bits/s). Support unit prefixes such as K or M

Audio codec attributes

Default format codec

Name	Type	Default	Description
b	int	128000	Set audio bitrate (in bits/s). Support unit prefixes such as K

MPEG Program Stream (PS)

Configuration Parameter: mpeg

Extensions: mpg,mpeg

Additional attributes

Name	Type	Default	Description
split_channels	option_fixed	0	Split the overall audio channel into individual audio tracks, where each track contains a specific number of channels specified by the split_channels property. For example, if you record an input source with 12 audio channels and split_channels='4', you will get 3 audio tracks, each containing 4 audio channels Supported values: `0`, `1`, `2`, `4`, `6`, `8`.
scc_capture	option_fixed	true	Capture SCC Closed Captioning Supported values: `true`, `false`.
anc_capture	option_fixed	false	Capture ANC Closed Captioning Supported values: `true`, `false`.
embed_cc	bool	false	Enable embedding Closed Captions (ATSC) into elementary video stream
raw_video	string		MWriter only (legacy FFmpeg encoder): also write the encoded video stream to this file path
raw_audio	string		MWriter only (legacy FFmpeg encoder): also write the encoded audio stream of track 0 to this file path; raw_audio.N for track N
ignore_pts	option_fixed	true	MWriter only (legacy FFmpeg encoder): number video frames by a frame counter instead of the sample times Supported values: `false`, `true`.
start_timecode	option	auto	Set start timecode for encoding. Possible values are: auto (default), disabled, local_time or a custom string like "10:00:00:00" Supported values: `auto`, `disabled`, `local_time`.
muxrate	int	0	Set user-defined mux rate expressed as a number of bits/s. If not specied the automatically computed mux rate is employed. Default value is 0 Range: minimum 0; maximum 1677721200.
preload	int		Set initial demux-decode delay in microseconds Range: minimum 0.0; maximum 2147483647.
packetsize	int		set packet size (from 0 to INT_MAX) (default 0)
fflags	flags		FFmpeg fflags option. (default autobsf) Supported values: `flush_packets`, `bitexact`, `autobsf`. `flush_packets`: reduce the latency by flushing out packets immediately `bitexact`: do not write random/volatile data `autobsf`: add needed bsfs automatically
fdebug	flags		print specific debug info (default 0) Supported values: `ts`, `id3v2`. `ts`: ts `id3v2`: id3v2
max_delay	int		maximum muxing or demuxing delay in microseconds (from -1 to INT_MAX) (default -1)
start_time_realtime	string		wall-clock time when stream begins (PTS==0) (from I64_MIN to I64_MAX) (default I64_MIN)
audio_preload	int		microseconds by which audio packets should be interleaved earlier (from 0 to 2.14748e+09) (default 0)
chunk_duration	int		microseconds for each chunk (from 0 to 2.14748e+09) (default 0)
chunk_size	int		size in bytes for each chunk (from 0 to 2.14748e+09) (default 0)
flush_packets	int		enable flushing of the I/O context after each packet (from -1 to 1) (default -1)
metadata_header_padding	int		set number of bytes to be written as padding in a metadata header (from -1 to INT_MAX) (default -1)
output_ts_offset	string		set output timestamp offset (default 0)
max_interleave_delta	string		maximum buffering duration for interleaving (from 0 to I64_MAX) (default 10000000)
f_strict	option		how strictly to follow the standards (deprecated; use strict, save via avconv) (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
strict	option		how strictly to follow the standards (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
avoid_negative_ts	option		shift timestamps so they start at 0 (from -1 to 2) (default auto) Supported values: `auto`, `disabled`, `make_non_negative`, `make_zero`. `auto`: -1: enabled when required by target format `disabled`: 0: do not change timestamps `make_non_negative`: 1: shift timestamps so they are non negative `make_zero`: 2: shift timestamps so they start at 0

Video codecs

Default format codec
AV1 (FFmpeg VPL-MSDK, HW)
H.264 AVC (AMD AMF, HW)
H.264 AVC (Cisco OpenH264, SW)
H.264 AVC (FFmpeg VPL-MSDK, HW)
H.264 AVC (Intel QuickSync, SW)
H.264 AVC (Intel QuickSync, HW)
H.264 AVC (libx264, SW)
H.264 AVC (NVIDIA NVENC, HW)
H.264 AVC (NVIDIA NVENC Lossless, HW)
H.265 HEVC (AMD AMF, HW)
H.265 HEVC (FFmpeg VPL-MSDK, HW)
H.265 HEVC (Intel QuickSync, HW)
H.265 HEVC (NVIDIA NVENC, HW)
H.265 HEVC (NVIDIA NVENC Lossless, HW)
H.265 HEVC (x265, SW)
H.266 VVC (Fraunhofer VVenC, SW)
MPEG-1 Video (SW)
MPEG-2 Video (SW)
MPEG-4 Part 2 Video (ASP, SW)
Direct Stream Copy (No Re-Encoding)
No Video (Disabled)

Audio codecs

Default format codec
AC-3 (Dolby Digital, Floating-Point)
AC-3 (Dolby Digital, Fixed-Point)
MP2 (MPEG Audio Layer 2)
MP3 (LAME, MPEG Audio Layer 3)
Direct Stream Copy (No Re-Encoding)
No Audio (Disabled)

Video codec attributes

Default format codec

Name	Type	Default	Description
b	int	5M	Set video bitrate (in bits/s). Support unit prefixes such as K or M

Audio codec attributes

Default format codec

Name	Type	Default	Description
b	int	128000	Set audio bitrate (in bits/s). Support unit prefixes such as K

MPEG Transport Stream (TS File)

Configuration Parameter: mpegts

Extensions: ts,m2t,m2ts,mts

Additional attributes

Name	Type	Default	Description
split_channels	option_fixed	0	Split the overall audio channel into individual audio tracks, where each track contains a specific number of channels specified by the split_channels property. For example, if you record an input source with 12 audio channels and split_channels='4', you will get 3 audio tracks, each containing 4 audio channels Supported values: `0`, `1`, `2`, `4`, `6`, `8`.
scc_capture	option_fixed	true	Capture SCC Closed Captioning Supported values: `true`, `false`.
anc_capture	option_fixed	false	Capture ANC Closed Captioning Supported values: `true`, `false`.
embed_cc	bool	false	Enable embedding Closed Captions (ATSC) into elementary video stream
embed_scte35	bool	false	Enable embedding SCTE-35 triggers into MPEG transport stream
raw_video	string		MWriter only (legacy FFmpeg encoder): also write the encoded video stream to this file path
raw_audio	string		MWriter only (legacy FFmpeg encoder): also write the encoded audio stream of track 0 to this file path; raw_audio.N for track N
ignore_pts	option_fixed		MWriter only (legacy FFmpeg encoder): number video frames by a frame counter instead of the sample times Supported values: `false`, `true`.
start_timecode	option	auto	Set start timecode for encoding. Possible values are: auto (default), disabled, local_time or a custom string like "10:00:00:00" Supported values: `auto`, `disabled`, `local_time`.
mpegts_transport_stream_id	int	1	Set the transport_stream_id field. This identifies a transponder in DVB. Default is 0x0001 Range: minimum 1.0; maximum 65535.0.
mpegts_original_network_id	int	65281	Set the original_network_id. This is unique identifier of a network in DVB. Its main use is in the unique identification of a service through the path Original_Network_ID, Transport_Stream_ID Range: minimum 1.0; maximum 65535.0.
mpegts_service_id	int	1	Set the service_id, also known as program in DVB. Default is 0x0001 Range: minimum 1.0; maximum 65535.0.
mpegts_service_type	option	digital_tv	Set service_type field. Digital Television serviceDigital Radio serviceTeletext serviceAdvanced Codec Digital Radio serviceMPEG2 Digital HDTV serviceAdvanced Codec Digital SDTV serviceAdvanced Codec Digital HDTV serviceHEVC Digital Television service Supported values: `digital_tv`, `digital_radio`, `teletext`, `advanced_codec_digital_radio`, `mpeg2_digital_hdtv`, `advanced_codec_digital_sdtv`, `advanced_codec_digital_hdtv`, `hevc_digital_hdtv`.
mpegts_pmt_start_pid	int	4096	Set the first PID for PMTs. Default is 0x1000, minimum is 0x0020, maximum is 0x1ffa. This option has no effect in m2ts mode where the PMT PID is fixed 0x0100 Range: minimum 32; maximum 8186.
mpegts_start_pid	int	256	Set the first PID for elementary streams. Default is 0x0100, minimum is 0x0020, maximum is 0x1ffa. This option has no effect in m2ts mode where the elementary stream PIDs are fixed Range: minimum 32; maximum 8186.
mpegts_m2ts_mode	option_fixed		Enable M2TS mode. auto enables it when the file extension is .m2ts (FFmpeg default auto). Supported values: `auto`, `false`, `true`.
muxrate	int		Set a constant muxrate (in bits/s). Default is VBR Range: minimum 0; maximum 2147483647.
pes_payload_size	int		Set minimum PES packet payload in bytes. Default is 2930 Range: minimum 0.0; maximum 2147483647.
mpegts_flags	flags		Set mpegts flags. Accepts the following options Reemit PAT/PMT before writing the next packetUse LATM packetization for AACReemit PAT and PMT at each video frameConform to System B (DVB) instead of System A (ATSC)Mark initial packets as discontinuous Supported values: `resend_headers`, `latm`, `pat_pmt_at_frames`, `system_b`, `initial_discontinuity`, `nit`, `omit_rai`. `nit`: Enable NIT transmission `omit_rai`: Disable writing of random access indicator
mpegts_copyts	option_fixed		Do not offset DTS/PTS by max_delay; auto and false offset them (FFmpeg default auto). Supported values: `auto`, `false`, `true`.
tables_version	int	0	Set PAT, PMT, SDT and NIT version (default 0, valid values are from 0 to 31, inclusively). This option allows updating stream structure so that standard consumer may detect the change
omit_video_pes_length	option_fixed		Omit the PES packet length for video packets Supported values: `false`, `true`.
pcr_period	int	20	Override the PCR retransmission interval in milliseconds. The SDK preset default is 20 ms. Set -1 for automatic selection: 20 ms for CBR streams, or the highest multiple of the frame duration below 100 ms for VBR streams. Range: minimum -1; maximum 2147483647.
pat_period	double		PAT/PMT retransmission time limit in seconds Range: minimum 0.0.
sdt_period	double		SDT retransmission time limit in seconds Range: minimum 0.0.
cc_language	string	und	ISO 639-2 language of one configured digital caption service advertised in PMT when embed_cc is enabled. Empty or invalid values use und. No automatic service detection or caption encoding conversion. Supported video: H.264, MPEG-2 and MPEG-4; no descriptor in M2TS/BDAV; unsupported video codecs produce a warning
cc_service	int	1	CEA-708 caption service number advertised in PMT Range: minimum 1; maximum 63.
cc_korean_code	bool	true	Korean extension per KCS.KO-07.0093 (2013), section 4.2, Table 4.7: false for KS X 1001, true for Unicode when cc_language=kor. For other languages the A/65 reserved bit remains 1. Signalling only; caption bytes are not converted
cc_easy_reader	bool	false	CEA-708 caption service easy-reader flag
cc_wide_aspect	bool	true	CEA-708 caption service wide-aspect-ratio flag
scte35_pid	int	-1	Set SCTE-35 stream PID. Use -1 for automatic PID assignment
nit_period	string		NIT retransmission time limit in seconds (default 3)
tdt_period	string		TDT retransmission time limit in seconds (default 10)
eit_period	string		EIT present/following retransmission time limit in seconds (default 0.5)
dvb	option_fixed		DVB compatible MPEG-TS (NIT on, PAT/PMT not forced at video frames). Supported values: `false`, `true`.
start_pcr	double		Set the start PCR value in seconds (from 0 to INT_MAX) (default 0)
packetsize	int		set packet size (from 0 to INT_MAX) (default 0)
fflags	flags		FFmpeg fflags option. (default autobsf) Supported values: `flush_packets`, `bitexact`, `autobsf`. `flush_packets`: reduce the latency by flushing out packets immediately `bitexact`: do not write random/volatile data `autobsf`: add needed bsfs automatically
fdebug	flags		print specific debug info (default 0) Supported values: `ts`, `id3v2`. `ts`: ts `id3v2`: id3v2
max_delay	int		maximum muxing or demuxing delay in microseconds (from -1 to INT_MAX) (default -1)
start_time_realtime	string		wall-clock time when stream begins (PTS==0) (from I64_MIN to I64_MAX) (default I64_MIN)
audio_preload	int		microseconds by which audio packets should be interleaved earlier (from 0 to 2.14748e+09) (default 0)
chunk_duration	int		microseconds for each chunk (from 0 to 2.14748e+09) (default 0)
chunk_size	int		size in bytes for each chunk (from 0 to 2.14748e+09) (default 0)
flush_packets	int		enable flushing of the I/O context after each packet (from -1 to 1) (default -1)
metadata_header_padding	int		set number of bytes to be written as padding in a metadata header (from -1 to INT_MAX) (default -1)
output_ts_offset	string		set output timestamp offset (default 0)
max_interleave_delta	string		maximum buffering duration for interleaving (from 0 to I64_MAX) (default 10000000)
f_strict	option		how strictly to follow the standards (deprecated; use strict, save via avconv) (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
strict	option		how strictly to follow the standards (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
avoid_negative_ts	option		shift timestamps so they start at 0 (from -1 to 2) (default auto) Supported values: `auto`, `disabled`, `make_non_negative`, `make_zero`. `auto`: -1: enabled when required by target format `disabled`: 0: do not change timestamps `make_non_negative`: 1: shift timestamps so they are non negative `make_zero`: 2: shift timestamps so they start at 0

Video codecs

Default format codec
AV1 (FFmpeg VPL-MSDK, HW)
H.264 AVC (AMD AMF, HW)
H.264 AVC (Cisco OpenH264, SW)
H.264 AVC (FFmpeg VPL-MSDK, HW)
H.264 AVC (Intel QuickSync, SW)
H.264 AVC (Intel QuickSync, HW)
H.264 AVC (libx264, SW)
H.264 AVC (NVIDIA NVENC, HW)
H.264 AVC (NVIDIA NVENC Lossless, HW)
H.265 HEVC (AMD AMF, HW)
H.265 HEVC (FFmpeg VPL-MSDK, HW)
H.265 HEVC (Intel QuickSync, HW)
H.265 HEVC (NVIDIA NVENC, HW)
H.265 HEVC (NVIDIA NVENC Lossless, HW)
H.265 HEVC (x265, SW)
H.266 VVC (Fraunhofer VVenC, SW)
MPEG-2 Video (SW)
MPEG-4 Part 2 Video (ASP, SW)
Direct Stream Copy (No Re-Encoding)
No Video (Disabled)

Audio codecs

Default format codec
AAC (Advanced Audio Coding)
AC-3 (Dolby Digital, Floating-Point)
AC-3 (Dolby Digital, Fixed-Point)
MP2 (MPEG Audio Layer 2)
MP3 (LAME, MPEG Audio Layer 3)
Direct Stream Copy (No Re-Encoding)
No Audio (Disabled)

Video codec attributes

Default format codec

Name	Type	Default	Description
b	int	5M	Set video bitrate (in bits/s). Support unit prefixes such as K or M

Audio codec attributes

Default format codec

Name	Type	Default	Description
b	int	128000	Set audio bitrate (in bits/s). Support unit prefixes such as K

MPEG-DASH Streaming (Adaptive HTTP)

Configuration Parameter: dash

Extensions: mpd

Additional attributes

Name	Type	Default	Description
adaptation_sets	string		Adaptation sets. Syntax: id=0,streams=0,1,2 id=1,streams=3,4 and so on
window_size	int	0	Number of segments kept in the manifest Range: minimum 0.0; maximum 2147483647.
extra_window_size	int	5	Number of segments kept outside of the manifest before removing from disk Range: minimum 0.0; maximum 2147483647.
seg_duration	string		Segment duration (in seconds, fractional value can be set)
frag_duration	string		Fragment duration (in seconds, fractional value can be set)
frag_type	option	none	Set type of interval for fragments One fragment per segmentFragment at every frameFragment at specific time intervalsFragment at keyframes and following P-Frame reordering (Video only, experimental) Supported values: `none`, `every_frame`, `duration`, `pframes`.
remove_at_exit	bool	false	Enable or disable removal of all segments when finished. This is disabled by default
use_template	bool	true	Enable or disable use of SegmentTemplate instead of SegmentList in the manifest. This is enabled by default
use_timeline	bool	true	Enable or disable use of SegmentTimeline within the SegmentTemplate manifest section. This is enabled by default
single_file	bool	false	Enable or disable storing all segments in one file, accessed using byte ranges. The name of the single file can be specified with the single_file_name option, if not specified assume the basename of the manifest file with the output format extension. This is disabled by default.
single_file_name	string		DASH-templated name to use for the manifest baseURL element. Imply that the single_file option is set to true. In the template, $ext$ is replaced with the file name extension specific for the segment format
init_seg_name	string	init-stream$RepresentationID$.$ext$	DASH-templated name to use for the initialization segment. Default is init-stream$RepresentationID$.$ext$. $ext$ is replaced with the file name extension specific for the segment format
media_seg_name	string	chunk-stream$RepresentationID$-$Number%05d$.$ext$	DASH-templated name to use for the media segments. Default is chunk-stream$RepresentationID$-$Number%05d$.$ext$. $ext$ is replaced with the file name extension specific for the segment format
utc_timing_url	string		URL of the page that will return the UTC timestamp in ISO format, for example https://time.akamai.com/?iso
method	string		Use the given HTTP method to create output files. Generally set to PUT or POST
http_user_agent	string		Override User-Agent field in HTTP header. Applicable only for HTTP output
http_persistent	option_fixed		Use persistent HTTP connections. Applicable only for HTTP output Supported values: `false`, `true`.
hls_playlist	option_fixed		Generate HLS playlist files. The master playlist is generated with filename specified by the hls_master_name option. One media playlist file is generated for each stream with filenames media_0.m3u8, media_1.m3u8, etc Supported values: `false`, `true`.
streaming	bool	false	Enable or disable chunk streaming mode of output. In chunk streaming mode, each frame will be a moof fragment which forms a chunk. This is disabled by default
timeout	string		Set timeout for socket I/O operations expressed in seconds (fractional value can be set). Applicable only for HTTP output
index_correction	bool	false	Enable or disable segment index correction logic. Applicable only when use_template is enabled and use_timeline is disabled. This is disabled by default. When enabled, the logic monitors the flow of segment indexes. If a streams’s segment index value is not at the expected real time position, then the logic corrects that index value. Typically this logic is needed in live streaming use cases. The network bandwidth fluctuations are common during long run streaming. Each fluctuation can cause the segment indexes fall behind the expected real time position
format_options	string		Set container format (mp4/webm) options using a :-separated list of key=value parameters. Values containing : special characters must be escaped
global_sidx	option_fixed		Write global SIDX atom. Applicable only for single file, mp4 output, non-streaming mode Supported values: `false`, `true`.
dash_segment_type	option	auto	Set dash segment files type Supported values: `auto`, `mp4`, `webm`. `auto`: Select segment file format based on codec `mp4`: Make segment file in ISOBMFF format `webm`: Make segment file in WebM format
segment_type	option_fixed		Select segment file format based on codecMake segment file in ISOBMFF formatMake segment file in WebM format Supported values: `auto`, `mp4`, `webm`.
ignore_io_errors	bool	false	Ignore IO errors during open and write. Useful for long-duration runs with network output. This is disabled by default
lhls	option_fixed		Enable Low-latency HLS(Experimental). Adds #EXT-X-PREFETCH tag with current segment's URI. This is an experimental feature Supported values: `false`, `true`.
ldash	bool	false	Enable Low-latency Dash by constraining the presence and values of some elements. This is disabled by default
master_m3u8_publish_rate	int	0	Publish master playlist repeatedly every after specified number of segment intervals Range: minimum 0.0; maximum 4294967295.
write_prft	option_fixed		Write Producer Reference Time elements on supported streams. This also enables writing prft boxes in the underlying muxer. Applicable only when the utc_url option is enabled. It is set to auto by default, in which case the muxer will attempt to enable it only in modes that require it Supported values: `auto`, `false`, `true`.
mpd_profile	flags	+dash	Set profiles. Elements and values used in the manifest may be constrained by them MPEG-DASH ISO Base media file format live profileDVB-DASH profile Supported values: `dash`, `dvb_dash`.
http_opts	string		Specify a list of :-separated key=value options to pass to the underlying HTTP protocol. Applicable only for HTTP output
target_latency	string		Set an intended target latency in seconds for serving (fractional value can be set). Applicable only when the streaming and write_prft options are enabled. This is an informative fields clients can use to measure the latency of the service
min_playback_rate	double	1/1	Set the minimum playback rate indicated as appropriate for the purposes of automatically adjusting playback latency and buffer occupancy during normal playback by clients Range: minimum 0.5; maximum 1.5.
max_playback_rate	double	1/1	Set the maximum playback rate indicated as appropriate for the purposes of automatically adjusting playback latency and buffer occupancy during normal playback by clients Range: minimum 0.5; maximum 1.5.
hls_master_name	string		HLS master playlist name (default "master.m3u8")
availability_start_time_ms	string		set MPD availabilityStartTime as epoch milliseconds (from 0 to 9.22337e+15) (default 0)
suggested_presentation_delay	string		set MPD suggestedPresentationDelay (default 0)
update_period	string		Set the mpd update interval (from 0 to I64_MAX) (default 0)
packetsize	int		set packet size (from 0 to INT_MAX) (default 0)
fflags	flags		FFmpeg fflags option. (default autobsf) Supported values: `flush_packets`, `bitexact`, `autobsf`. `flush_packets`: reduce the latency by flushing out packets immediately `bitexact`: do not write random/volatile data `autobsf`: add needed bsfs automatically
fdebug	flags		print specific debug info (default 0) Supported values: `ts`, `id3v2`. `ts`: ts `id3v2`: id3v2
max_delay	int		maximum muxing or demuxing delay in microseconds (from -1 to INT_MAX) (default -1)
start_time_realtime	string		wall-clock time when stream begins (PTS==0) (from I64_MIN to I64_MAX) (default I64_MIN)
audio_preload	int		microseconds by which audio packets should be interleaved earlier (from 0 to 2.14748e+09) (default 0)
chunk_duration	int		microseconds for each chunk (from 0 to 2.14748e+09) (default 0)
chunk_size	int		size in bytes for each chunk (from 0 to 2.14748e+09) (default 0)
flush_packets	int		enable flushing of the I/O context after each packet (from -1 to 1) (default -1)
metadata_header_padding	int		set number of bytes to be written as padding in a metadata header (from -1 to INT_MAX) (default -1)
output_ts_offset	string		set output timestamp offset (default 0)
max_interleave_delta	string		maximum buffering duration for interleaving (from 0 to I64_MAX) (default 10000000)
f_strict	option		how strictly to follow the standards (deprecated; use strict, save via avconv) (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
strict	option		how strictly to follow the standards (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
avoid_negative_ts	option		shift timestamps so they start at 0 (from -1 to 2) (default auto) Supported values: `auto`, `disabled`, `make_non_negative`, `make_zero`. `auto`: -1: enabled when required by target format `disabled`: 0: do not change timestamps `make_non_negative`: 1: shift timestamps so they are non negative `make_zero`: 2: shift timestamps so they start at 0

Video codecs

Default format codec
H.264 AVC (AMD AMF, HW)
H.264 AVC (Cisco OpenH264, SW)
H.264 AVC (FFmpeg VPL-MSDK, HW)
H.264 AVC (Intel QuickSync, SW)
H.264 AVC (Intel QuickSync, HW)
H.264 AVC (libx264, SW)
H.264 AVC (NVIDIA NVENC, HW)
H.264 AVC (NVIDIA NVENC Lossless, HW)

Audio codecs

Default format codec
AAC (Advanced Audio Coding)
MP3 (LAME, MPEG Audio Layer 3)

Video codec attributes

Default format codec

Name	Type	Default	Description
b	int	5M	Set video bitrate (in bits/s). Support unit prefixes such as K or M

Audio codec attributes

Default format codec

Name	Type	Default	Description
b	int	128000	Set audio bitrate (in bits/s). Support unit prefixes such as K

MXF (Material eXchange Format)

Configuration Parameter: mxf

Extensions: mxf

Additional attributes

Name	Type	Default	Description
split_channels	option_fixed	0	Split the overall audio channel into individual audio tracks, where each track contains a specific number of channels specified by the split_channels property. For example, if you record an input source with 12 audio channels and split_channels='4', you will get 3 audio tracks, each containing 4 audio channels Supported values: `0`, `1`, `2`, `4`, `6`, `8`.
scc_capture	option_fixed	true	Capture SCC Closed Captioning Supported values: `true`, `false`.
anc_capture	option_fixed	false	Capture ANC Closed Captioning Supported values: `true`, `false`.
embed_cc	bool	false	Enable embedding Closed Captions (ATSC) into elementary video stream
raw_video	string		MWriter only (legacy FFmpeg encoder): also write the encoded video stream to this file path
raw_audio	string		MWriter only (legacy FFmpeg encoder): also write the encoded audio stream of track 0 to this file path; raw_audio.N for track N
start_timecode	option	auto	Set start timecode for encoding. Possible values are: auto (default), disabled, local_time or a custom string like "10:00:00:00" Supported values: `auto`, `disabled`, `local_time`.
ignore_pts	option_fixed		MWriter only (legacy FFmpeg encoder): number video frames by a frame counter instead of the sample times Supported values: `false`, `true`.
mxf.anc_write	bool	false	Write raw ANC.Line.N to a frame-wrapped ST 436 track in the final MXF OP1a file. Other settings are unchanged. ANC in PWR files is not supported. After a timestamp discontinuity or snapshot queue overflow, ANC remains empty until the encoder is closed or reinitialized
signal_standard	option		Force/set Signal Standard (from -1 to 7) (default -1) Supported values: `bt601`, `bt1358`, `smpte347m`, `smpte274m`, `smpte296m`, `smpte349m`, `smpte428`. `bt601`: 1: ITU-R BT.601 and BT.656, also SMPTE 125M (525 and 625 line interlaced) `bt1358`: 2: ITU-R BT.1358 and ITU-R BT.799-3, also SMPTE 293M (525 and 625 line progressive) `smpte347m`: 3: SMPTE 347M (540 Mbps mappings) `smpte274m`: 4: SMPTE 274M (1125 line) `smpte296m`: 5: SMPTE 296M (750 line progressive) `smpte349m`: 6: SMPTE 349M (1485 Mbps mappings) `smpte428`: 7: SMPTE 428-1 DCDM
store_user_comments	option_fixed		FFmpeg store_user_comments option. (default true) Supported values: `false`, `true`.
track_origin	string		pre-charge (Origin) in edit units, written on the File Source Package tracks (from 0 to I64_MAX) (default 0)
packetsize	int		set packet size (from 0 to INT_MAX) (default 0)
fflags	flags		FFmpeg fflags option. (default autobsf) Supported values: `flush_packets`, `bitexact`, `autobsf`. `flush_packets`: reduce the latency by flushing out packets immediately `bitexact`: do not write random/volatile data `autobsf`: add needed bsfs automatically
fdebug	flags		print specific debug info (default 0) Supported values: `ts`, `id3v2`. `ts`: ts `id3v2`: id3v2
max_delay	int		maximum muxing or demuxing delay in microseconds (from -1 to INT_MAX) (default -1)
start_time_realtime	string		wall-clock time when stream begins (PTS==0) (from I64_MIN to I64_MAX) (default I64_MIN)
audio_preload	int		microseconds by which audio packets should be interleaved earlier (from 0 to 2.14748e+09) (default 0)
chunk_duration	int		microseconds for each chunk (from 0 to 2.14748e+09) (default 0)
chunk_size	int		size in bytes for each chunk (from 0 to 2.14748e+09) (default 0)
flush_packets	int		enable flushing of the I/O context after each packet (from -1 to 1) (default -1)
metadata_header_padding	int		set number of bytes to be written as padding in a metadata header (from -1 to INT_MAX) (default -1)
output_ts_offset	string		set output timestamp offset (default 0)
max_interleave_delta	string		maximum buffering duration for interleaving (from 0 to I64_MAX) (default 10000000)
f_strict	option		how strictly to follow the standards (deprecated; use strict, save via avconv) (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
strict	option		how strictly to follow the standards (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
avoid_negative_ts	option		shift timestamps so they start at 0 (from -1 to 2) (default auto) Supported values: `auto`, `disabled`, `make_non_negative`, `make_zero`. `auto`: -1: enabled when required by target format `disabled`: 0: do not change timestamps `make_non_negative`: 1: shift timestamps so they are non negative `make_zero`: 2: shift timestamps so they start at 0

Video codecs

DV / DVCPRO HD (SW)
H.264 AVC (AMD AMF, HW)
H.264 AVC (Cisco OpenH264, SW)
H.264 AVC (FFmpeg VPL-MSDK, HW)
H.264 AVC (Intel QuickSync, SW)
H.264 AVC (Intel QuickSync, HW)
H.264 AVC (libx264, SW)
H.264 AVC (NVIDIA NVENC, HW)
H.264 AVC (NVIDIA NVENC Lossless, HW)
MPEG-2 Video (SW)
VC3/DNxHD 720
VC3/DNxHD 1080
Direct Stream Copy (No Re-Encoding)
No Video (Disabled)

Audio codecs

PCM 16-bit Signed LE
PCM 24-bit Signed LE
Direct Stream Copy (No Re-Encoding)
No Audio (Disabled)

Video codec attributes

VC3/DNxHD 720

Name	Type	Default	Description
b	option_fixed	90M	Set bitrate (in bits/s). Possible values: 220M, 175M, 145M, 115M, 90M, 60M Supported values: `220M`, `175M`, `145M`, `115M`, `90M`, `60M`.

VC3/DNxHD 1080

Name	Type	Default	Description
b	option_fixed	120M	Set bitrate (in bits/s). Possible values: 440M, 365M, 290M, 240M, 220M, 185M, 175M, 145M, 120M, 115M, 45M, 36M Supported values: `440M`, `365M`, `290M`, `240M`, `220M`, `185M`, `175M`, `145M`, `120M`, `115M`, `90M`, `45M`, `36M`.

MXF D-10 (IMX D-10 Mapping)

Configuration Parameter: mxf_d10

Extensions: mxf

Additional attributes

Name	Type	Default	Description
split_channels	option_fixed	0	Split the overall audio channel into individual audio tracks, where each track contains a specific number of channels specified by the split_channels property. For example, if you record an input source with 12 audio channels and split_channels='4', you will get 3 audio tracks, each containing 4 audio channels Supported values: `0`, `1`, `2`, `4`, `6`, `8`.
scc_capture	option_fixed	true	Capture SCC Closed Captioning Supported values: `true`, `false`.
anc_capture	option_fixed	false	Capture ANC Closed Captioning Supported values: `true`, `false`.
embed_cc	bool	false	Enable embedding Closed Captions (ATSC) into elementary video stream
raw_video	string		MWriter only (legacy FFmpeg encoder): also write the encoded video stream to this file path
raw_audio	string		MWriter only (legacy FFmpeg encoder): also write the encoded audio stream of track 0 to this file path; raw_audio.N for track N
start_timecode	option	auto	Set start timecode for encoding. Possible values are: auto (default), disabled, local_time or a custom string like "10:00:00:00" Supported values: `auto`, `disabled`, `local_time`.
ignore_pts	option_fixed		MWriter only (legacy FFmpeg encoder): number video frames by a frame counter instead of the sample times Supported values: `false`, `true`.
d10_channelcount	int		Force/set channelcount in generic sound essence descriptor (from -1 to 8) (default -1)
signal_standard	option		Force/set Signal Standard (from -1 to 7) (default -1) Supported values: `bt601`, `bt1358`, `smpte347m`, `smpte274m`, `smpte296m`, `smpte349m`, `smpte428`. `bt601`: 1: ITU-R BT.601 and BT.656, also SMPTE 125M (525 and 625 line interlaced) `bt1358`: 2: ITU-R BT.1358 and ITU-R BT.799-3, also SMPTE 293M (525 and 625 line progressive) `smpte347m`: 3: SMPTE 347M (540 Mbps mappings) `smpte274m`: 4: SMPTE 274M (1125 line) `smpte296m`: 5: SMPTE 296M (750 line progressive) `smpte349m`: 6: SMPTE 349M (1485 Mbps mappings) `smpte428`: 7: SMPTE 428-1 DCDM
store_user_comments	option_fixed		FFmpeg store_user_comments option. (default false) Supported values: `false`, `true`.
packetsize	int		set packet size (from 0 to INT_MAX) (default 0)
fflags	flags		FFmpeg fflags option. (default autobsf) Supported values: `flush_packets`, `bitexact`, `autobsf`. `flush_packets`: reduce the latency by flushing out packets immediately `bitexact`: do not write random/volatile data `autobsf`: add needed bsfs automatically
fdebug	flags		print specific debug info (default 0) Supported values: `ts`, `id3v2`. `ts`: ts `id3v2`: id3v2
max_delay	int		maximum muxing or demuxing delay in microseconds (from -1 to INT_MAX) (default -1)
start_time_realtime	string		wall-clock time when stream begins (PTS==0) (from I64_MIN to I64_MAX) (default I64_MIN)
audio_preload	int		microseconds by which audio packets should be interleaved earlier (from 0 to 2.14748e+09) (default 0)
chunk_duration	int		microseconds for each chunk (from 0 to 2.14748e+09) (default 0)
chunk_size	int		size in bytes for each chunk (from 0 to 2.14748e+09) (default 0)
flush_packets	int		enable flushing of the I/O context after each packet (from -1 to 1) (default -1)
metadata_header_padding	int		set number of bytes to be written as padding in a metadata header (from -1 to INT_MAX) (default -1)
output_ts_offset	string		set output timestamp offset (default 0)
max_interleave_delta	string		maximum buffering duration for interleaving (from 0 to I64_MAX) (default 10000000)
f_strict	option		how strictly to follow the standards (deprecated; use strict, save via avconv) (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
strict	option		how strictly to follow the standards (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
avoid_negative_ts	option		shift timestamps so they start at 0 (from -1 to 2) (default auto) Supported values: `auto`, `disabled`, `make_non_negative`, `make_zero`. `auto`: -1: enabled when required by target format `disabled`: 0: do not change timestamps `make_non_negative`: 1: shift timestamps so they are non negative `make_zero`: 2: shift timestamps so they start at 0

Video codecs

MPEG-2 Video 30Mbps
MPEG-2 Video 40Mbps
MPEG-2 Video 50Mbps
Direct stream copy

Audio codecs

PCM 16-bit Signed LE
PCM 24-bit Signed LE
Direct Stream Copy (No Re-Encoding)
No Audio (Disabled)

Ogg Vorbis

Configuration Parameter: ogg

Extensions: ogg

Additional attributes

Name	Type	Description
serial_offset	int	serial number offset (from 0 to INT_MAX) (default 0)
page_duration	string	preferred page duration, in microseconds (from 0 to I64_MAX) (default 1000000)
packetsize	int	set packet size (from 0 to INT_MAX) (default 0)
fflags	flags	FFmpeg fflags option. (default autobsf) Supported values: `flush_packets`, `bitexact`, `autobsf`. `flush_packets`: reduce the latency by flushing out packets immediately `bitexact`: do not write random/volatile data `autobsf`: add needed bsfs automatically
fdebug	flags	print specific debug info (default 0) Supported values: `ts`, `id3v2`. `ts`: ts `id3v2`: id3v2
max_delay	int	maximum muxing or demuxing delay in microseconds (from -1 to INT_MAX) (default -1)
start_time_realtime	string	wall-clock time when stream begins (PTS==0) (from I64_MIN to I64_MAX) (default I64_MIN)
audio_preload	int	microseconds by which audio packets should be interleaved earlier (from 0 to 2.14748e+09) (default 0)
chunk_duration	int	microseconds for each chunk (from 0 to 2.14748e+09) (default 0)
chunk_size	int	size in bytes for each chunk (from 0 to 2.14748e+09) (default 0)
flush_packets	int	enable flushing of the I/O context after each packet (from -1 to 1) (default -1)
metadata_header_padding	int	set number of bytes to be written as padding in a metadata header (from -1 to INT_MAX) (default -1)
output_ts_offset	string	set output timestamp offset (default 0)
max_interleave_delta	string	maximum buffering duration for interleaving (from 0 to I64_MAX) (default 10000000)
f_strict	option	how strictly to follow the standards (deprecated; use strict, save via avconv) (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
strict	option	how strictly to follow the standards (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
avoid_negative_ts	option	shift timestamps so they start at 0 (from -1 to 2) (default auto) Supported values: `auto`, `disabled`, `make_non_negative`, `make_zero`. `auto`: -1: enabled when required by target format `disabled`: 0: do not change timestamps `make_non_negative`: 1: shift timestamps so they are non negative `make_zero`: 2: shift timestamps so they start at 0

Video codecs

No Video (Disabled)

Audio codecs

Ogg Vorbis

RIST Streaming (Reliable Internet Stream Transport)

Configuration Parameter: mpegts

Extensions: rist://

Additional attributes

Name	Type	Default	Description
rist_profile	flags	main	simple profilemain profileadvanced profile Supported values: `simple`, `main`, `advanced`.
buffer_size	int		Set internal RIST buffer size in milliseconds for retransmission of data. Default value is 0 which means the librist default (1 sec). Maximum value is 30000 milliseconds Range: minimum 0; maximum 30000.
pkt_size	int	1316	Set maximum packet size for sending data Range: minimum 1; maximum 9972.
log_level	int		Set loglevel for RIST logging messages. You only need to set this if you explicitly want to enable debug level messages or packet loss simulation, otherwise the regular loglevel is respected Range: minimum -1.
secret	string		Set override of encryption secret, by default is unset
encryption	string		Set encryption type, by default is disabled. Acceptable values are 128 and 256
split_channels	option_fixed	0	Split the overall audio channel into individual audio tracks, where each track contains a specific number of channels specified by the split_channels property. For example, if you record an input source with 12 audio channels and split_channels='4', you will get 3 audio tracks, each containing 4 audio channels Supported values: `0`, `1`, `2`, `4`, `6`, `8`.
embed_tc	bool	false	Enable embedding Time Code into elementary video stream (for H.264 video only)
embed_cc	bool	false	Enable embedding Closed Captions (ATSC) into elementary video stream
embed_scte35	bool	false	Enable embedding SCTE-35 triggers into MPEG transport stream
mpegts_transport_stream_id	int	1	Set the transport_stream_id. This identifies a transponder in DVB. Default is 0x0001 Range: minimum 1.0; maximum 65535.0.
mpegts_original_network_id	int	65281	Set the original_network_id. This is unique identifier of a network in DVB. Its main use is in the unique identification of a service through the path Original_Network_ID, Transport_Stream_ID Range: minimum 1.0; maximum 65535.0.
mpegts_service_id	int	1	Set the service_id, also known as program in DVB. Default is 0x0001 Range: minimum 1.0; maximum 65535.0.
mpegts_service_type	option	digital_tv	Set service_type field Digital TelevisionDigital RadioTeletextAdvanced Codec Digital RadioMPEG2 Digital HDTVAdvanced Codec Digital SDTVAdvanced Codec Digital HDTVHEVC Digital Television Service Supported values: `digital_tv`, `digital_radio`, `teletext`, `advanced_codec_digital_radio`, `mpeg2_digital_hdtv`, `advanced_codec_digital_sdtv`, `advanced_codec_digital_hdtv`, `hevc_digital_hdtv`.
mpegts_pmt_start_pid	int	4096	Set the first PID for PMTs. Default is 0x1000, minimum is 0x0020, maximum is 0x1ffa. This option has no effect in m2ts mode where the PMT PID is fixed 0x0100 Range: minimum 32; maximum 8186.
mpegts_start_pid	int	256	SSet the first PID for elementary streams. Default is 0x0100, minimum is 0x0020, maximum is 0x1ffa. This option has no effect in m2ts mode where the elementary stream PIDs are fixed Range: minimum 32; maximum 8186.
mpegts_m2ts_mode	option_fixed		Enable M2TS mode. auto enables it when the file extension is .m2ts (FFmpeg default auto). Supported values: `auto`, `false`, `true`.
muxrate	int	1	Set a constant muxrate. Default is VBR Range: minimum 0; maximum 2147483647.
pes_payload_size	int	2930	Minimum PES packet payload in bytes Range: minimum 0.0; maximum 2147483647.
mpegts_flags	flags		MPEG-TS muxing flags Reemit PAT/PMT before writing the next packetUse LATM packetization for AACReemit PAT and PMT at each video frameConform to System B (DVB) instead of System A (ATSC)Mark initial packets as discontinuous Supported values: `resend_headers`, `latm`, `pat_pmt_at_frames`, `system_b`, `initial_discontinuity`, `nit`, `omit_rai`. `nit`: Enable NIT transmission `omit_rai`: Disable writing of random access indicator
mpegts_copyts	option_fixed		Do not offset DTS/PTS by max_delay; auto and false offset them (FFmpeg default auto). Supported values: `auto`, `false`, `true`.
tables_version	int	0	Set PAT, PMT, SDT and NIT version (default 0, valid values are from 0 to 31, inclusively). This option allows updating stream structure so that standard consumer may detect the change
omit_video_pes_length	bool	true	Omit the PES packet length for video packets. Default value is true
pcr_period	int	20	Override the PCR retransmission interval in milliseconds. The SDK preset default is 20 ms. Set -1 for automatic selection: 20 ms for CBR streams, or the highest multiple of the frame duration below 100 ms for VBR streams. Range: minimum -1; maximum 2147483647.
pat_period	double		PAT/PMT retransmission time limit in seconds Range: minimum 0.0.
sdt_period	double		Maximum time in seconds between SDT tables
cc_language	string	und	ISO 639-2 language of one configured digital caption service advertised in PMT when embed_cc is enabled. Empty or invalid values use und. No automatic service detection or caption encoding conversion. Supported video: H.264, MPEG-2 and MPEG-4; no descriptor in M2TS/BDAV; unsupported video codecs produce a warning
cc_service	int	1	CEA-708 caption service number advertised in PMT Range: minimum 1; maximum 63.
cc_korean_code	bool	true	Korean extension per KCS.KO-07.0093 (2013), section 4.2, Table 4.7: false for KS X 1001, true for Unicode when cc_language=kor. For other languages the A/65 reserved bit remains 1. Signalling only; caption bytes are not converted
cc_easy_reader	bool	false	CEA-708 caption service easy-reader flag
cc_wide_aspect	bool	true	CEA-708 caption service wide-aspect-ratio flag
scte35_pid	int	-1	Set SCTE-35 stream PID. Use -1 for automatic PID assignment
nit_period	string		NIT retransmission time limit in seconds (default 3)
tdt_period	string		TDT retransmission time limit in seconds (default 10)
eit_period	string		EIT present/following retransmission time limit in seconds (default 0.5)
dvb	option_fixed		DVB compatible MPEG-TS (NIT on, PAT/PMT not forced at video frames). Supported values: `false`, `true`.
start_pcr	double		Set the start PCR value in seconds (from 0 to INT_MAX) (default 0)
packetsize	int		set packet size (from 0 to INT_MAX) (default 0)
fflags	flags		FFmpeg fflags option. (default autobsf) Supported values: `flush_packets`, `bitexact`, `autobsf`. `flush_packets`: reduce the latency by flushing out packets immediately `bitexact`: do not write random/volatile data `autobsf`: add needed bsfs automatically
fdebug	flags		print specific debug info (default 0) Supported values: `ts`, `id3v2`. `ts`: ts `id3v2`: id3v2
max_delay	int		maximum muxing or demuxing delay in microseconds (from -1 to INT_MAX) (default -1)
start_time_realtime	string		wall-clock time when stream begins (PTS==0) (from I64_MIN to I64_MAX) (default I64_MIN)
audio_preload	int		microseconds by which audio packets should be interleaved earlier (from 0 to 2.14748e+09) (default 0)
chunk_duration	int		microseconds for each chunk (from 0 to 2.14748e+09) (default 0)
chunk_size	int		size in bytes for each chunk (from 0 to 2.14748e+09) (default 0)
flush_packets	int		enable flushing of the I/O context after each packet (from -1 to 1) (default -1)
metadata_header_padding	int		set number of bytes to be written as padding in a metadata header (from -1 to INT_MAX) (default -1)
output_ts_offset	string		set output timestamp offset (default 0)
max_interleave_delta	string		maximum buffering duration for interleaving (from 0 to I64_MAX) (default 10000000)
f_strict	option		how strictly to follow the standards (deprecated; use strict, save via avconv) (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
strict	option		how strictly to follow the standards (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
avoid_negative_ts	option		shift timestamps so they start at 0 (from -1 to 2) (default auto) Supported values: `auto`, `disabled`, `make_non_negative`, `make_zero`. `auto`: -1: enabled when required by target format `disabled`: 0: do not change timestamps `make_non_negative`: 1: shift timestamps so they are non negative `make_zero`: 2: shift timestamps so they start at 0

Video codecs

Default format codec
AV1 (FFmpeg VPL-MSDK, HW)
H.264 AVC (AMD AMF, HW)
H.264 AVC (Cisco OpenH264, SW)
H.264 AVC (FFmpeg VPL-MSDK, HW)
H.264 AVC (Intel QuickSync, SW)
H.264 AVC (Intel QuickSync, HW)
H.264 AVC (libx264, SW)
H.264 AVC (NVIDIA NVENC, HW)
H.264 AVC (NVIDIA NVENC Lossless, HW)
H.265 HEVC (AMD AMF, HW)
H.265 HEVC (FFmpeg VPL-MSDK, HW)
H.265 HEVC (Intel QuickSync, HW)
H.265 HEVC (NVIDIA NVENC, HW)
H.265 HEVC (NVIDIA NVENC Lossless, HW)
H.265 HEVC (x265, SW)
H.266 VVC (Fraunhofer VVenC, SW)
MPEG-2 Video (SW)
MPEG-4 Part 2 Video (ASP, SW)
Direct Stream Copy (No Re-Encoding)
No Video (Disabled)

Audio codecs

Default format codec
AAC (Advanced Audio Coding)
AC-3 (Dolby Digital, Floating-Point)
AC-3 (Dolby Digital, Fixed-Point)
MP2 (MPEG Audio Layer 2)
MP3 (LAME, MPEG Audio Layer 3)
Direct Stream Copy (No Re-Encoding)
No Audio (Disabled)

Video codec attributes

Default format codec

Name	Type	Default	Description
b	int	5M	Set video bitrate (in bits/s). Support unit prefixes such as K or M

Audio codec attributes

Default format codec

Name	Type	Default	Description
b	int	128000	Set audio bitrate (in bits/s). Support unit prefixes such as K

RTMP Streaming (Flash / YouTube / Twitch)

Configuration Parameter: flv

Extensions: rtmp://

Additional attributes

Name	Type	Default	Description
split_channels	option_fixed	0	Split the overall audio channel into individual audio tracks, where each track contains a specific number of channels specified by the split_channels property. For example, if you record an input source with 12 audio channels and split_channels='4', you will get 3 audio tracks, each containing 4 audio channels Supported values: `0`, `1`, `2`, `4`, `6`, `8`.
merge_tracks	option_fixed	true	Merge audio tracks Supported values: `true`, `false`.
embed_cc	bool	false	Enable embedding Closed Captions (ATSC) into elementary video stream
rtmp_app	string		Name of application to connect on the RTMP server. This option overrides the parameter specified in the URI
rtmp_buffer	string		Set the client buffer time in milliseconds. The default is 3000
rtmp_flashver	string		Version of the Flash plugin used to run the SWF player. The default is LNX 9,0,124,2. (When publishing, the default is FMLE/3.0 (compatible; 'libavformat version')
rtmp_playpath	string		Stream identifier to play or to publish. This option overrides the parameter specified in the URI
vt_sync_msec	int	5000	Set the video time synchronization interval
flvflags	flags		FLV muxer flags (default 0) Supported values: `aac_seq_header_detect`, `no_sequence_end`, `no_metadata`, `no_duration_filesize`, `add_keyframe_index`. `aac_seq_header_detect`: Put AAC sequence header based on stream data `no_sequence_end`: disable sequence end for FLV `no_metadata`: disable metadata for FLV `no_duration_filesize`: disable duration and filesize zero value metadata for FLV `add_keyframe_index`: Add keyframe index metadata
rtmp_conn	string		Append arbitrary AMF data to the Connect message
rtmp_flush_interval	int		Number of packets flushed in the same request (RTMPT only). (from 0 to INT_MAX) (default 10)
rtmp_enhanced_codecs	string		Specify the codec(s) to use in an enhanced rtmp live stream
rtmp_swfurl	string		URL of the SWF player. By default no value will be sent
rtmp_tcurl	string		URL of the target stream. Defaults to proto://host[:port]/app.
tcp_nodelay	int		Use TCP_NODELAY to disable Nagle's algorithm (from 0 to 1) (default 0)
packetsize	int		set packet size (from 0 to INT_MAX) (default 0)
fflags	flags		FFmpeg fflags option. (default autobsf) Supported values: `flush_packets`, `bitexact`, `autobsf`. `flush_packets`: reduce the latency by flushing out packets immediately `bitexact`: do not write random/volatile data `autobsf`: add needed bsfs automatically
fdebug	flags		print specific debug info (default 0) Supported values: `ts`, `id3v2`. `ts`: ts `id3v2`: id3v2
max_delay	int		maximum muxing or demuxing delay in microseconds (from -1 to INT_MAX) (default -1)
start_time_realtime	string		wall-clock time when stream begins (PTS==0) (from I64_MIN to I64_MAX) (default I64_MIN)
audio_preload	int		microseconds by which audio packets should be interleaved earlier (from 0 to 2.14748e+09) (default 0)
chunk_duration	int		microseconds for each chunk (from 0 to 2.14748e+09) (default 0)
chunk_size	int		size in bytes for each chunk (from 0 to 2.14748e+09) (default 0)
flush_packets	int		enable flushing of the I/O context after each packet (from -1 to 1) (default -1)
metadata_header_padding	int		set number of bytes to be written as padding in a metadata header (from -1 to INT_MAX) (default -1)
output_ts_offset	string		set output timestamp offset (default 0)
max_interleave_delta	string		maximum buffering duration for interleaving (from 0 to I64_MAX) (default 10000000)
f_strict	option		how strictly to follow the standards (deprecated; use strict, save via avconv) (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
strict	option		how strictly to follow the standards (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
avoid_negative_ts	option		shift timestamps so they start at 0 (from -1 to 2) (default auto) Supported values: `auto`, `disabled`, `make_non_negative`, `make_zero`. `auto`: -1: enabled when required by target format `disabled`: 0: do not change timestamps `make_non_negative`: 1: shift timestamps so they are non negative `make_zero`: 2: shift timestamps so they start at 0

Video codecs

Default format codec
AV1 (FFmpeg VPL-MSDK, HW)
AV1 (NVIDIA NVENC, HW)
FLV / Sorenson Spark (H.263, SW)
H.264 AVC (AMD AMF, HW)
H.264 AVC (Cisco OpenH264, SW)
H.264 AVC (FFmpeg VPL-MSDK, HW)
H.264 AVC (Intel QuickSync, SW)
H.264 AVC (Intel QuickSync, HW)
H.264 AVC (libx264, SW)
H.264 AVC (NVIDIA NVENC, HW)
H.264 AVC (NVIDIA NVENC Lossless, HW)
H.265 HEVC (AMD AMF, HW)
H.265 HEVC (FFmpeg VPL-MSDK, HW)
H.265 HEVC (Intel QuickSync, HW)
H.265 HEVC (NVIDIA NVENC, HW)
H.265 HEVC (NVIDIA NVENC Lossless, HW)
H.265 HEVC (x265, SW)
VP8 (Google, SW)
VP9 (Google, SW)
Direct Stream Copy (No Re-Encoding)
No Video (Disabled)

Audio codecs

AAC (Advanced Audio Coding)
MP3 (LAME, MPEG Audio Layer 3)
PCM 16-bit Signed LE
Direct Stream Copy (No Re-Encoding)
No Audio (Disabled)

Video codec attributes

Default format codec

Name	Type	Default	Description
b	int	5M	Set video bitrate (in bits/s). Support unit prefixes such as K or M

RTP Streaming (Pro-MPEG FEC)

Configuration Parameter: rtp_mpegts

Extensions:

Additional attributes

Name	Type	Default	Description
l	int	8	The number of columns (4-20, LxD Lsss 100) Range: minimum 4; maximum 20.
d	int	4	The number of rows (4-20, LxD Less 100) Range: minimum 4; maximum 20.
mpegts_muxer_options	string		set list of options for the MPEG-TS muxer
rtp_muxer_options	string		set list of options for the RTP muxer
packetsize	int		set packet size (from 0 to INT_MAX) (default 0)
fflags	flags		FFmpeg fflags option. (default autobsf) Supported values: `flush_packets`, `bitexact`, `autobsf`. `flush_packets`: reduce the latency by flushing out packets immediately `bitexact`: do not write random/volatile data `autobsf`: add needed bsfs automatically
fdebug	flags		print specific debug info (default 0) Supported values: `ts`, `id3v2`. `ts`: ts `id3v2`: id3v2
max_delay	int		maximum muxing or demuxing delay in microseconds (from -1 to INT_MAX) (default -1)
start_time_realtime	string		wall-clock time when stream begins (PTS==0) (from I64_MIN to I64_MAX) (default I64_MIN)
audio_preload	int		microseconds by which audio packets should be interleaved earlier (from 0 to 2.14748e+09) (default 0)
chunk_duration	int		microseconds for each chunk (from 0 to 2.14748e+09) (default 0)
chunk_size	int		size in bytes for each chunk (from 0 to 2.14748e+09) (default 0)
flush_packets	int		enable flushing of the I/O context after each packet (from -1 to 1) (default -1)
metadata_header_padding	int		set number of bytes to be written as padding in a metadata header (from -1 to INT_MAX) (default -1)
output_ts_offset	string		set output timestamp offset (default 0)
max_interleave_delta	string		maximum buffering duration for interleaving (from 0 to I64_MAX) (default 10000000)
f_strict	option		how strictly to follow the standards (deprecated; use strict, save via avconv) (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
strict	option		how strictly to follow the standards (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
avoid_negative_ts	option		shift timestamps so they start at 0 (from -1 to 2) (default auto) Supported values: `auto`, `disabled`, `make_non_negative`, `make_zero`. `auto`: -1: enabled when required by target format `disabled`: 0: do not change timestamps `make_non_negative`: 1: shift timestamps so they are non negative `make_zero`: 2: shift timestamps so they start at 0

Video codecs

Default format codec
AV1 (FFmpeg VPL-MSDK, HW)
H.264 AVC (AMD AMF, HW)
H.264 AVC (Cisco OpenH264, SW)
H.264 AVC (FFmpeg VPL-MSDK, HW)
H.264 AVC (Intel QuickSync, SW)
H.264 AVC (Intel QuickSync, HW)
H.264 AVC (libx264, SW)
H.264 AVC (NVIDIA NVENC, HW)
H.264 AVC (NVIDIA NVENC Lossless, HW)
H.265 HEVC (AMD AMF, HW)
H.265 HEVC (FFmpeg VPL-MSDK, HW)
H.265 HEVC (Intel QuickSync, HW)
H.265 HEVC (NVIDIA NVENC, HW)
H.265 HEVC (NVIDIA NVENC Lossless, HW)
H.265 HEVC (x265, SW)
H.266 VVC (Fraunhofer VVenC, SW)
MPEG-2 Video (SW)
MPEG-4 Part 2 Video (ASP, SW)
No Video (Disabled)

Audio codecs

Default format codec
AAC (Advanced Audio Coding)
AC-3 (Dolby Digital, Floating-Point)
AC-3 (Dolby Digital, Fixed-Point)
MP2 (MPEG Audio Layer 2)
MP3 (LAME, MPEG Audio Layer 3)
No Audio (Disabled)

Video codec attributes

Default format codec

Name	Type	Default	Description
b	int	5M	Set video bitrate (in bits/s). Support unit prefixes such as K or M

Audio codec attributes

Default format codec

Name	Type	Default	Description
b	int	128000	Set audio bitrate (in bits/s). Support unit prefixes such as K

RTP Streaming (Realtime Transport Protocol)

Configuration Parameter: rtp

Extensions:

Additional attributes

Name	Type	Default	Description
sdp	string	C:\Config.sdp	Path to .sdp file. This file contains sdp information for an output stream to file. This allows dumping sdp information when at least one output isn’t an rtp stream. (Requires at least one of the output formats to be rtp)
rtpflags	flags		Add RTP hinting tracks to the output file. The following flags can be used Use MP4A-LATM packetization instead of MPEG4-GENERIC for AACUse RFC 2190 packetization instead of RFC 4629 for H.263Don't send RTCP sender reportsUse mode 0 for H.264 in RTPSend RTCP BYE packets when finishing Supported values: `latm`, `rfc2190`, `skip_rtcp`, `h264_mode0`, `send_bye`.
payload_type	int	-1	Specify RTP payload type Range: minimum -1.0; maximum 127.0.
ssrc	int	0	Stream identifier
cname	string		CNAME to include in RTCP SR packets
seq	int		Starting sequence number Range: minimum -1.0; maximum 65535.0.
ttl	int		Time to live (multicast only) (from -1 to 255) (default -1)
buffer_size	int		Send/Receive buffer size (in bytes) (from -1 to INT_MAX) (default -1)
rtcp_port	int		Custom rtcp port (from -1 to INT_MAX) (default -1)
rtcpport	int		Custom rtcp port (from -1 to INT_MAX) (default -1)
local_rtpport	int		Local rtp port (from -1 to INT_MAX) (default -1)
localrtpport	int		Local rtp port (from -1 to INT_MAX) (default -1)
local_rtcpport	int		Local rtcp port (from -1 to INT_MAX) (default -1)
localrtcpport	int		Local rtcp port (from -1 to INT_MAX) (default -1)
connect	option_fixed		Connect socket (default false) Supported values: `false`, `true`.
write_to_source	option_fixed		Send packets to the source address of the latest received packet (default false) Supported values: `false`, `true`.
pkt_size	int		Maximum packet size (from -1 to INT_MAX) (default -1)
dscp	int		DSCP class (from -1 to INT_MAX) (default -1)
timeout	string		set timeout (in microseconds) of socket I/O operations (from -1 to I64_MAX) (default -1)
sources	string		Source list
block	string		Block list
fec	string		FEC
localaddr	string		Local address
packetsize	int		set packet size (from 0 to INT_MAX) (default 0)
fflags	flags		FFmpeg fflags option. (default autobsf) Supported values: `flush_packets`, `bitexact`, `autobsf`. `flush_packets`: reduce the latency by flushing out packets immediately `bitexact`: do not write random/volatile data `autobsf`: add needed bsfs automatically
fdebug	flags		print specific debug info (default 0) Supported values: `ts`, `id3v2`. `ts`: ts `id3v2`: id3v2
max_delay	int		maximum muxing or demuxing delay in microseconds (from -1 to INT_MAX) (default -1)
start_time_realtime	string		wall-clock time when stream begins (PTS==0) (from I64_MIN to I64_MAX) (default I64_MIN)
audio_preload	int		microseconds by which audio packets should be interleaved earlier (from 0 to 2.14748e+09) (default 0)
chunk_duration	int		microseconds for each chunk (from 0 to 2.14748e+09) (default 0)
chunk_size	int		size in bytes for each chunk (from 0 to 2.14748e+09) (default 0)
flush_packets	int		enable flushing of the I/O context after each packet (from -1 to 1) (default -1)
metadata_header_padding	int		set number of bytes to be written as padding in a metadata header (from -1 to INT_MAX) (default -1)
output_ts_offset	string		set output timestamp offset (default 0)
max_interleave_delta	string		maximum buffering duration for interleaving (from 0 to I64_MAX) (default 10000000)
f_strict	option		how strictly to follow the standards (deprecated; use strict, save via avconv) (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
strict	option		how strictly to follow the standards (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
avoid_negative_ts	option		shift timestamps so they start at 0 (from -1 to 2) (default auto) Supported values: `auto`, `disabled`, `make_non_negative`, `make_zero`. `auto`: -1: enabled when required by target format `disabled`: 0: do not change timestamps `make_non_negative`: 1: shift timestamps so they are non negative `make_zero`: 2: shift timestamps so they start at 0

Video codecs

Default format codec
AV1 (FFmpeg VPL-MSDK, HW)
H.264 AVC (AMD AMF, HW)
H.264 AVC (Cisco OpenH264, SW)
H.264 AVC (FFmpeg VPL-MSDK, HW)
H.264 AVC (Intel QuickSync, SW)
H.264 AVC (Intel QuickSync, HW)
H.264 AVC (libx264, SW)
H.264 AVC (NVIDIA NVENC, HW)
H.264 AVC (NVIDIA NVENC Lossless, HW)
H.265 HEVC (AMD AMF, HW)
H.265 HEVC (FFmpeg VPL-MSDK, HW)
H.265 HEVC (Intel QuickSync, HW)
H.265 HEVC (NVIDIA NVENC, HW)
H.265 HEVC (NVIDIA NVENC Lossless, HW)
H.265 HEVC (x265, SW)
H.266 VVC (Fraunhofer VVenC, SW)
MPEG-2 Video (SW)
MPEG-4 Part 2 Video (ASP, SW)
No Video (Disabled)

Audio codecs

Default format codec
MP2 (MPEG Audio Layer 2)
No Audio (Disabled)

Video codec attributes

Default format codec

Name	Type	Default	Description
b	int	200000	Set bitrate (in bits/s)

Audio codec attributes

Default format codec

Name	Type	Default	Description
b	int	128000	Set audio bitrate (in bits/s). Support unit prefixes such as K

RTSP Streaming (ANNOUNCE, limited servers)

Configuration Parameter: rtsp

Extensions: rtsp://

Additional attributes

Name	Type	Default	Description
split_channels	option_fixed	0	Split the overall audio channel into individual audio tracks, where each track contains a specific number of channels specified by the split_channels property. For example, if you record an input source with 12 audio channels and split_channels='4', you will get 3 audio tracks, each containing 4 audio channels Supported values: `0`, `1`, `2`, `4`, `6`, `8`.
embed_cc	bool	false	Enable embedding Closed Captions (ATSC) into elementary video stream
rtpflags	flags		RTP muxer flags Use MP4A-LATM packetization instead of MPEG4-GENERIC for AACUse RFC 2190 packetization instead of RFC 4629 for H.263Don't send RTCP sender reportsUse mode 0 for H.264 in RTPSend RTCP BYE packets when finishing Supported values: `latm`, `rfc2190`, `skip_rtcp`, `h264_mode0`, `send_bye`.
rtsp_transport	flags		Set RTSP output transport: UDP or TCP interleaving. Multicast and HTTP/HTTPS tunneling are receive-side options in the bundled FFmpeg. Supported values: `udp`, `tcp`. `udp`: Use UDP as lower transport protocol `tcp`: Use TCP (interleaving within the RTSP control channel) as lower transport protocol
rtsp_flags	flags		Set RTSP flags. For output only prefer_tcp applies: try RTP over TCP first when rtsp_transport allows both UDP and TCP (default none) Supported values: `prefer_tcp`. `prefer_tcp`: Try RTP via TCP first, if available
min_port	int	5000	Set minimum local UDP port. Default value is 5000 Range: minimum 0; maximum 65535.
max_port	int	65000	Set maximum local UDP port. Default value is 65000 Range: minimum 0; maximum 65535.
buffer_size	int	-1	Underlying protocol send/receive buffer size in bytes Range: minimum -1; maximum 2147483647.
pkt_size	int		Underlying protocol send packet size (from -1 to INT_MAX) (default 1472)
ca_file	string		Certificate Authority database file
cafile	string		Certificate Authority database file
tls_verify	option_fixed		Verify the peer certificate (default true) Supported values: `false`, `true`.
verify	option_fixed		Verify the peer certificate (default true) Supported values: `false`, `true`.
cert_file	string		Certificate file
cert	string		Certificate file
key_file	string		Private key file
key	string		Private key file
verifyhost	string		Verify against a specific hostname
packetsize	int		set packet size (from 0 to INT_MAX) (default 0)
fflags	flags		FFmpeg fflags option. (default autobsf) Supported values: `flush_packets`, `bitexact`, `autobsf`. `flush_packets`: reduce the latency by flushing out packets immediately `bitexact`: do not write random/volatile data `autobsf`: add needed bsfs automatically
fdebug	flags		print specific debug info (default 0) Supported values: `ts`, `id3v2`. `ts`: ts `id3v2`: id3v2
max_delay	int		maximum muxing or demuxing delay in microseconds (from -1 to INT_MAX) (default -1)
start_time_realtime	string		wall-clock time when stream begins (PTS==0) (from I64_MIN to I64_MAX) (default I64_MIN)
audio_preload	int		microseconds by which audio packets should be interleaved earlier (from 0 to 2.14748e+09) (default 0)
chunk_duration	int		microseconds for each chunk (from 0 to 2.14748e+09) (default 0)
chunk_size	int		size in bytes for each chunk (from 0 to 2.14748e+09) (default 0)
flush_packets	int		enable flushing of the I/O context after each packet (from -1 to 1) (default -1)
metadata_header_padding	int		set number of bytes to be written as padding in a metadata header (from -1 to INT_MAX) (default -1)
output_ts_offset	string		set output timestamp offset (default 0)
max_interleave_delta	string		maximum buffering duration for interleaving (from 0 to I64_MAX) (default 10000000)
f_strict	option		how strictly to follow the standards (deprecated; use strict, save via avconv) (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
strict	option		how strictly to follow the standards (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
avoid_negative_ts	option		shift timestamps so they start at 0 (from -1 to 2) (default auto) Supported values: `auto`, `disabled`, `make_non_negative`, `make_zero`. `auto`: -1: enabled when required by target format `disabled`: 0: do not change timestamps `make_non_negative`: 1: shift timestamps so they are non negative `make_zero`: 2: shift timestamps so they start at 0
timeout	string		Timeout of the RTSP control TCP connection and its I/O operations, in microseconds; replaces stimeout of older FFmpeg (default 0: no timeout)

Video codecs

Default format codec
AV1 (FFmpeg VPL-MSDK, HW)
H.264 AVC (AMD AMF, HW)
H.264 AVC (Cisco OpenH264, SW)
H.264 AVC (FFmpeg VPL-MSDK, HW)
H.264 AVC (Intel QuickSync, SW)
H.264 AVC (Intel QuickSync, HW)
H.264 AVC (libx264, SW)
H.264 AVC (NVIDIA NVENC, HW)
H.265 HEVC (AMD AMF, HW)
H.265 HEVC (FFmpeg VPL-MSDK, HW)
H.265 HEVC (Intel QuickSync, HW)
H.265 HEVC (NVIDIA NVENC, HW)
H.265 HEVC (x265, SW)
MPEG-2 Video (SW)
MPEG-4 Part 2 Video (ASP, SW)
Direct Stream Copy (No Re-Encoding)
No Video (Disabled)

Audio codecs

Default format codec
AAC (Advanced Audio Coding)
No Audio (Disabled)

Video codec attributes

Default format codec

Name	Type	Default	Description
b	int	5M	Set video bitrate (in bits/s). Support unit prefixes such as K or M

Audio codec attributes

Default format codec

Name	Type	Default	Description
b	int	128000	Set audio bitrate (in bits/s). Support unit prefixes such as K

SRT Streaming (DVB-Compatible Mode)

Configuration Parameter: dvb

Extensions: srt://

Additional attributes

Name	Type	Default	Description
maxbw	string	-1	Maximum send bandwidth in bytes per second (64-bit integer): -1 is unlimited; 0 derives the limit from inputbw and oheadbw.
pbkeylen	option_fixed	0	Sender encryption key length, in bytes. Only can be set to 0, 16, 24 and 32. Enable sender encryption if not 0. Not required on receiver (set to 0), key size obtained from sender in HaiCrypt handshake. Default value is 0 Supported values: `0`, `16`, `24`, `32`.
passphrase	string		Sets the passphrase for encryption (must be at least 10 characters). This turns encryption on on this side (or turns it off, if empty passphrase is passed)
mss	int	1500	Maximum Segment Size. Used for buffer allocation and rate calculation using packet counter assuming fully filled packets. The smallest MSS between the peers is used. This is 1500 by default in the overall internet. This is the maximum size of the UDP packet and can be only decreased, unless you have some unusual dedicated network settings. Not to be mistaken with the size of the UDP payload or SRT payload — this size is the size of the IP packet, including the UDP and SRT headers
fc	int	25600	Native SRT transport only (srt.force_ffmpeg=false); the FFmpeg transport uses ffs. Flow-control window in packets: maximum number of unacknowledged packets in flight. Must accommodate the configured receive buffer. Range: minimum 32.
sndbuf	int	12058624	Send Buffer Size. Warning: configured in bytes, converted in packets, when set, based on MSS value. For desired result, configure MSS first. Default value: 8192 × (1500-28)
rcvbuf	int	12058624	Receive Buffer Size. Receive buffer must not be greater than FC size. Warning: configured in bytes, converted in packets when set based on MSS value. For desired result, configure MSS first. Default value: 8192 × (1500-28)
ipttl	int	32	IPv4 Time To Live (see IP_TTL option for IP) or IPv6 unicast hops (see IPV6_UNICAST_HOPS for IPV6) depending on socket address family. Applies to sender only. Range: minimum 1; maximum 255.
iptos	int	184	IPv4 Type of Service (see IP_TOS option for IP) or IPv6 Traffic Class (see IPV6_TCLASS of IPv6) depending on socket address family. Applies to sender only. Default: 0xB8 Range: minimum 0; maximum 255.
inputbw	int	0	Sender nominal input rate. Used along with OHEADBW, when MAXBW is set to relative (0), to calculate maximum sending rate when recovery packets are sent along with main media stream (INPUTBW × (100 + OHEADBW) / 100). If INPUTBW is not set while MAXBW is set to relative (0), the actual input rate is evaluated inside the library. Range: minimum 0.
oheadbw	int	25	Recovery bandwidth overhead above input rate (see SRTO_INPUTBW). Sender: user configurable, default: 25% Range: minimum 5; maximum 100.
latency	int	0	Set both receive and peer latency. Microseconds on the default FFmpeg SRT transport (srt.force_ffmpeg=true), milliseconds on the native SDK transport (srt.force_ffmpeg=false). Range: minimum 0.
tsbpddelay	string		FFmpeg SRT transport only (srt.force_ffmpeg=true). deprecated, same effect as latency option (from -1 to I64_MAX) (default -1)
tlpktdrop	bool	true	Too-late Packet Drop. When enabled on receiver, it skips missing packets that have not been delivered in time and delivers the subsequent packets to the application when their time-to-play has come. It also sends a fake ACK to the sender. When enabled on sender and enabled on the receiving peer, sender drops the older packets that have no chance to be delivered in time. It is automatically enabled in sender if receiver supports it
snddropdelay	int		The sender's extra delay before dropping packets. -1 disables packet dropping. Microseconds on the default FFmpeg SRT transport (srt.force_ffmpeg=true), milliseconds on the native SDK transport (srt.force_ffmpeg=false).
nakreport	bool	true	When set to true, Receiver will send UMSG_LOSSREPORT messages periodically until the lost packet is retransmitted or intentionally dropped
conntimeo	int	3000	Native SRT transport only (srt.force_ffmpeg=false). Connection timeout in milliseconds. The default FFmpeg transport uses connect_timeout in the URL instead.
lossmaxttl	int	0	The value up to which the Reorder Tolerance may grow. When Reorder Tolerance is > 0, then packet loss report is delayed until that number of packets come in. Reorder Tolerance increases every time a "belated" packet has come, but it wasn't due to retransmission (that is, when UDP packets tend to come out of order), with the difference between the latest sequence and this packet's sequence, and not more than the value of this option. By default it's 0, which means that this mechanism is turned off, and the loss report is always sent immediately upon experiencing a "gap" in sequences.
rcvlatency	int	0	The time that should elapse since the moment when the packet was sent and the moment when it's delivered to the receiver application in the receiving function. This time should be a buffer time large enough to cover the time spent for sending, unexpectedly extended RTT time, and the time needed to retransmit the lost UDP packet. The effective latency value will be the maximum of this options' value and the value of SRTO_PEERLATENCY set by the peer side Units: microseconds on the default FFmpeg SRT transport (srt.force_ffmpeg=true), milliseconds on the native SDK transport (srt.force_ffmpeg=false). Range: minimum 0.
peerlatency	int	0	Minimum receive latency advertised to the peer. Microseconds on the default FFmpeg SRT transport (srt.force_ffmpeg=true), milliseconds on the native SDK transport (srt.force_ffmpeg=false). Range: minimum 0.
minversion	int	0	The minimum SRT version that is required from the peer. A connection to a peer that does not satisfy the minimum version requirement will be rejected
streamid	string		A string limited to 512 characters that can be set on the socket prior to connecting. This stream ID will be able to be retrieved by the listener side from the socket that is returned from srt_accept and was connected by a socket with that set stream ID. SRT does not enforce any special interpretation of the contents of this string. As this uses internally the std::string type, there are additional functions for it in the legacy/C++ API (udt.h): UDT::setstreamid and UDT::getstreamid. This option doesn’t make sense in Rendezvous connection; the result might be that simply one side will override the value from the other side and it’s the matter of luck which one would win
smoother	string		FFmpeg SRT transport only (srt.force_ffmpeg=true). The type of Smoother used for the transmission for that socket, which is responsible for the transmission and congestion control. The Smoother type must be exactly the same on both connecting parties, otherwise the connection is rejected.
messageapi	bool	true	When set, this socket uses the Message API[*], otherwise it uses Buffer API. Note that in live mode (see SRTO_TRANSTYPE option) there’s only message API available.
payloadsize	int	1316	Sets the maximum declared size of a single call to sending function in Live mode. Use 0 if this value isn't used (which is default in file mode). This value shall not be exceeded for a single data sending instruction in Live mode/ Range: up to MTUsize-28-16, usually 1456
transtype	option_fixed		Sets the transmission type for the socket, in particular, setting this option sets multiple other parameters to their default values as required for a particular transmission type. Type: enum. Default: SRTT_LIVE. Range: SRTT_FILE Supported values: `live`, `file`.
kmrefreshrate	int		The number of packets to be transmitted after which the encryption key is switched to a new key. Default is -1. -1 means auto (0x1000000 in srt library). The range for this option is integers in the 0 - INT_MAX
kmpreannounce	int		The interval between when a new encryption key is sent and when switchover occurs. This value also applies to the subsequent interval between when switchover occurs and when the old encryption key is decommissioned. Default is -1. -1 means auto (0x1000 in srt library). The range for this option is integers in the 0 - INT_MAX
split_channels	option_fixed	0	Split the overall audio channel into individual audio tracks, where each track contains a specific number of channels specified by the split_channels property. For example, if you record an input source with 12 audio channels and split_channels='4', you will get 3 audio tracks, each containing 4 audio channels Supported values: `0`, `1`, `2`, `4`, `6`, `8`.
embed_cc	bool	false	Enable embedding Closed Captions (ATSC) into elementary video stream
embed_scte35	bool	false	Enable embedding SCTE-35 triggers into MPEG transport stream
service_name	string	MService001	Set Service Name
service_provider	string	Medialooks	Set Service Provider
transport_stream_id	int	1	Set transport_stream_id field Range: minimum 1; maximum 65535.
original_network_id	int	1	Set original_network_id field Range: minimum 1; maximum 65535.
muxrate	int	1	The combined rate of all video and audio elementary stream packets common to one program. This rate also includes the VBI and sub-picture private stream data, which MPEG treats as a private stream type Range: minimum 0; maximum 2147483647.
service_id	int	1	Set service_id field Range: minimum 1; maximum 65535.
service_type	option_fixed	digital_tv	Service type Supported values: `digital_tv`, `mpeg2_digital_hdtv`, `advanced_codec_digital_sdtv`, `advanced_codec_digital_hdtv`, `hevc_digital_hdtv`, `digital_radio`, `teletext`, `advanced_codec_digital_radio`. `digital_tv`: Digital Television. `digital_radio`: Digital Radio. `teletext`: Teletext. `advanced_codec_digital_radio`: Advanced Codec Digital Radio. `mpeg2_digital_hdtv`: MPEG2 Digital HDTV. `advanced_codec_digital_sdtv`: Advanced Codec Digital SDTV. `advanced_codec_digital_hdtv`: Advanced Codec Digital HDTV. `hevc_digital_hdtv`: HEVC Digital Television Service.
pmt_start_pid	int	192	Set the first pid of the PMT Range: minimum 32; maximum 8186.
start_pid	int	1024	Set the first pid Range: minimum 32; maximum 8186.
pes_payload_size	int	0	Set minimum PES packet payload in bytes. Default is 0: each audio frame is sent in its own PES packet Range: minimum 0.0; maximum 2147483647.
mpegts_flags	flags	+system_b	MPEG-TS muxing flags Reemit PAT/PMT before writing the next packetReemit PAT and PMT at each video frameUse LATM packetization for AACConform to System B (DVB) instead of System A (ATSC) Supported values: `resend_headers`, `latm`, `pat_pmt_at_frames`, `system_b`, `initial_discontinuity`, `nit`, `omit_rai`. `initial_discontinuity`: Mark initial packets as discontinuous `nit`: Enable NIT transmission `omit_rai`: Disable writing of random access indicator
start_timecode	option	auto	Set start timecode for encoding. Possible values are: auto (default), disabled, local_time or a custom string like "10:00:00:00" Supported values: `auto`, `disabled`, `local_time`.
tables_version	int	0	Set PAT, PMT, SDT and NIT version (default 0, valid values are from 0 to 31, inclusively). This option allows updating stream structure so that standard consumer may detect the change
rc_buffers	int	8	Rate-Control buffers
rc_sync_msec	int	1	Rate-Control precision (in msec, minimum 1 msec)
rc_max_underflow_msec	int	30	Rate-Control max underflow time, after this time the clock corrected (in msec)
pcr_period	int	20	Override the PCR retransmission interval in milliseconds. The SDK preset default is 20 ms. Set -1 for automatic selection: 20 ms for CBR streams, or the highest multiple of the frame duration below 100 ms for VBR streams. Range: minimum -1; maximum 2147483647.
pat_period	double	0.1	PAT/PMT retransmission time limit in seconds (default 100 msec)
sdt_period	double	0.5	SDT retransmission time limit in seconds (default 500 msec)
flush_packets	int	-1	Enable flushing of the I/O context after each packet Range: minimum -1; maximum 1.
max_delay	int	700000	Set maximum multiplexing PTS/PCR delay in microseconds Range: minimum 0.
cc_language	string	und	ISO 639-2 language of one configured digital caption service advertised in PMT when embed_cc is enabled. Empty or invalid values use und. No automatic service detection or caption encoding conversion. Supported video: H.264, MPEG-2 and MPEG-4; no descriptor in M2TS/BDAV; unsupported video codecs produce a warning
cc_service	int	1	CEA-708 caption service number advertised in PMT Range: minimum 1; maximum 63.
cc_korean_code	bool	true	Korean extension per KCS.KO-07.0093 (2013), section 4.2, Table 4.7: false for KS X 1001, true for Unicode when cc_language=kor. For other languages the A/65 reserved bit remains 1. Signalling only; caption bytes are not converted
cc_easy_reader	bool	false	CEA-708 caption service easy-reader flag
cc_wide_aspect	bool	true	CEA-708 caption service wide-aspect-ratio flag
scte35_pid	int	-1	Set SCTE-35 stream PID. Use -1 for automatic PID assignment
mpegts_m2ts_mode	option_fixed		Enable M2TS mode. auto enables it when the file extension is .m2ts (FFmpeg default auto). Supported values: `auto`, `false`, `true`.
mpegts_copyts	option_fixed		Do not offset DTS/PTS by max_delay; auto and false offset them (FFmpeg default auto). Supported values: `auto`, `false`, `true`.
omit_video_pes_length	option_fixed		Omit the PES packet length for video packets (default true) Supported values: `false`, `true`.
nit_period	string		NIT retransmission time limit in seconds (default 3)
tdt_period	string		TDT retransmission time limit in seconds (default 10)
eit_period	string		EIT present/following retransmission time limit in seconds (default 0.5)
dvb	option_fixed		DVB compatible MPEG-TS (NIT on, PAT/PMT not forced at video frames). The writer sets true for this format (SDK default true). Supported values: `false`, `true`.
start_pcr	double		Set the start PCR value in seconds (from 0 to INT_MAX) (default 0)
mininputbw	string		Native SRT transport only (srt.force_ffmpeg=false). Minimum input bandwidth in bytes per second for automatic input bandwidth estimation.
tsbpdmode	option_fixed		Enable timestamp-based packet delivery in the native SRT transport. Supported values: `false`, `true`.
drifttracer	option_fixed		Enable native SRT clock-drift correction. Supported values: `false`, `true`.
congestion	option_fixed		Native SRT congestion controller: live or file. Requires the native SRT transport; replaces the obsolete smoother name. Supported values: `live`, `file`.
enforcedencryption	option_fixed		Native SRT transport only (srt.force_ffmpeg=false); the FFmpeg transport uses enforced_encryption. Reject a peer whose encryption settings do not match. Supported values: `false`, `true`.
ipv6only	int		IPv6-only socket mode: -1 keeps the system default, 0 allows dual stack, 1 enables IPv6 only.
peeridletimeo	int		Peer idle timeout in milliseconds for the native SRT transport.
packetfilter	string		Native SRT packet-filter configuration string, for example FEC options.
retransmitalgo	int		Native SRT retransmission algorithm selector; supported values depend on the bundled SRT library.
mode	option		SRT connection mode. The writer defaults to caller. Supported values: `caller`, `listener`, `rendezvous`. `listener`: listener `rendezvous`: rendezvous
adapter	string		Local interface address used by the native SRT connection.
linger	int		SRT socket linger time in seconds, both transports. -1 keeps the library default. Range: minimum -1; maximum 2147483647.
srt.force_ffmpeg	option_fixed		Writer object property: set it with PropsSet on MFWriter/MWriter; the object property replaces a value in the format options. true (default): FFmpeg SRT transport, latency in microseconds; false: native SDK SRT transport, latency in milliseconds. Supported values: `false`, `true`.
timeout	string		FFmpeg SRT transport only (srt.force_ffmpeg=true). Timeout of socket I/O operations (in microseconds) (from -1 to I64_MAX) (default -1)
listen_timeout	string		FFmpeg SRT transport only (srt.force_ffmpeg=true). Connection awaiting timeout (in microseconds) (from -1 to I64_MAX) (default -1)
send_buffer_size	int		FFmpeg SRT transport only (srt.force_ffmpeg=true). Socket send buffer size (in bytes) (from -1 to INT_MAX) (default -1)
recv_buffer_size	int		FFmpeg SRT transport only (srt.force_ffmpeg=true). Socket receive buffer size (in bytes) (from -1 to INT_MAX) (default -1)
pkt_size	option		FFmpeg SRT transport only (srt.force_ffmpeg=true). Maximum SRT packet size (from -1 to 1456) (default -1) Supported values: `ts_size`, `max_size`. `ts_size`: 1316: ts_size `max_size`: 1456: max_size
payload_size	option		FFmpeg SRT transport only (srt.force_ffmpeg=true). Maximum SRT packet size (from -1 to 1456) (default -1) Supported values: `ts_size`, `max_size`. `ts_size`: 1316: ts_size `max_size`: 1456: max_size
enforced_encryption	option_fixed		FFmpeg SRT transport only (srt.force_ffmpeg=true). Enforces that both connection parties have the same passphrase set (default auto) Supported values: `auto`, `false`, `true`.
ffs	int		FFmpeg SRT transport only (srt.force_ffmpeg=true). Flow-control window (SRTO_FC) in packets (from -1 to INT_MAX; default -1).
connect_timeout	string		FFmpeg SRT transport (srt.force_ffmpeg=true, the writer default). Connect timeout in milliseconds. The writer adds connect_timeout=10000 to the srt:// URL unless the URL already has it; the URL value overrides this property. Set it in the URL, e.g. srt://host:port?connect_timeout=5000.
srt_streamid	string		FFmpeg SRT transport only (srt.force_ffmpeg=true). A string of up to 512 characters that an Initiator can pass to a Responder
tsbpd	option_fixed		Timestamp-based packet delivery (default auto). Both transports; the native transport reacts only to false. Supported values: `auto`, `false`, `true`.
localip	string		FFmpeg SRT transport only (srt.force_ffmpeg=true). localip desc
packetsize	int		set packet size (from 0 to INT_MAX) (default 0)
fflags	flags		FFmpeg fflags option. (default autobsf) Supported values: `flush_packets`, `bitexact`, `autobsf`. `flush_packets`: reduce the latency by flushing out packets immediately `bitexact`: do not write random/volatile data `autobsf`: add needed bsfs automatically
fdebug	flags		print specific debug info (default 0) Supported values: `ts`, `id3v2`. `ts`: ts `id3v2`: id3v2
start_time_realtime	string		wall-clock time when stream begins (PTS==0) (from I64_MIN to I64_MAX) (default I64_MIN)
audio_preload	int		microseconds by which audio packets should be interleaved earlier (from 0 to 2.14748e+09) (default 0)
chunk_duration	int		microseconds for each chunk (from 0 to 2.14748e+09) (default 0)
chunk_size	int		size in bytes for each chunk (from 0 to 2.14748e+09) (default 0)
metadata_header_padding	int		set number of bytes to be written as padding in a metadata header (from -1 to INT_MAX) (default -1)
output_ts_offset	string		set output timestamp offset (default 0)
max_interleave_delta	string		maximum buffering duration for interleaving (from 0 to I64_MAX) (default 10000000)
f_strict	option		how strictly to follow the standards (deprecated; use strict, save via avconv) (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
strict	option		how strictly to follow the standards (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
avoid_negative_ts	option		shift timestamps so they start at 0 (from -1 to 2) (default auto) Supported values: `auto`, `disabled`, `make_non_negative`, `make_zero`. `auto`: -1: enabled when required by target format `disabled`: 0: do not change timestamps `make_non_negative`: 1: shift timestamps so they are non negative `make_zero`: 2: shift timestamps so they start at 0

Video codecs

Default format codec
AV1 (FFmpeg VPL-MSDK, HW)
H.264 AVC (AMD AMF, HW)
H.264 AVC (Cisco OpenH264, SW)
H.264 AVC (FFmpeg VPL-MSDK, HW)
H.264 AVC (Intel QuickSync, SW)
H.264 AVC (Intel QuickSync, HW)
H.264 AVC (libx264, SW)
H.264 AVC (NVIDIA NVENC, HW)
H.264 AVC (NVIDIA NVENC Lossless, HW)
H.265 HEVC (AMD AMF, HW)
H.265 HEVC (FFmpeg VPL-MSDK, HW)
H.265 HEVC (Intel QuickSync, HW)
H.265 HEVC (NVIDIA NVENC, HW)
H.265 HEVC (NVIDIA NVENC Lossless, HW)
H.265 HEVC (x265, SW)
H.266 VVC (Fraunhofer VVenC, SW)
MPEG-2 Video (SW)
MPEG-4 Part 2 Video (ASP, SW)
Direct Stream Copy (No Re-Encoding)
No Video (Disabled)

Audio codecs

Default format codec
AAC (Advanced Audio Coding)
AC-3 (Dolby Digital, Floating-Point)
AC-3 (Dolby Digital, Fixed-Point)
MP2 (MPEG Audio Layer 2)
MP3 (LAME, MPEG Audio Layer 3)
Direct Stream Copy (No Re-Encoding)
No Audio (Disabled)

Video codec attributes

Default format codec

Name	Type	Default	Description
b	int	5M	Set video bitrate (in bits/s). Support unit prefixes such as K or M

Audio codec attributes

Default format codec

Name	Type	Default	Description
b	int	128000	Set audio bitrate (in bits/s). Support unit prefixes such as K

SRT Streaming (Secure Reliable Transport)

Configuration Parameter: mpegts

Extensions: srt://

Additional attributes

Name	Type	Default	Description
maxbw	string	-1	Maximum send bandwidth in bytes per second (64-bit integer): -1 is unlimited; 0 derives the limit from inputbw and oheadbw.
pbkeylen	option_fixed	0	Sender encryption key length, in bytes. Only can be set to 0, 16, 24 and 32. Enable sender encryption if not 0. Not required on receiver (set to 0), key size obtained from sender in HaiCrypt handshake. Default value is 0 Supported values: `0`, `16`, `24`, `32`.
passphrase	string		Sets the passphrase for encryption (must be at least 10 characters). This turns encryption on on this side (or turns it off, if empty passphrase is passed).
mss	int	1500	Maximum Segment Size. Used for buffer allocation and rate calculation using packet counter assuming fully filled packets. The smallest MSS between the peers is used. This is 1500 by default in the overall internet. This is the maximum size of the UDP packet and can be only decreased, unless you have some unusual dedicated network settings. Not to be mistaken with the size of the UDP payload or SRT payload — this size is the size of the IP packet, including the UDP and SRT headers
fc	int	25600	Native SRT transport only (srt.force_ffmpeg=false); the FFmpeg transport uses ffs. Flow-control window in packets: maximum number of unacknowledged packets in flight. Must accommodate the configured receive buffer. Range: minimum 32.
sndbuf	int	12058624	Send Buffer Size. Warning: configured in bytes, converted in packets, when set, based on MSS value. For desired result, configure MSS first. Default value: 8192 × (1500-28)
rcvbuf	int	12058624	Receive Buffer Size. Receive buffer must not be greater than FC size. Warning: configured in bytes, converted in packets when set based on MSS value. For desired result, configure MSS first. Default value: 8192 × (1500-28)
ipttl	int	32	IPv4 Time To Live (see IP_TTL option for IP) or IPv6 unicast hops (see IPV6_UNICAST_HOPS for IPV6) depending on socket address family. Applies to sender only Range: minimum 1; maximum 255.
iptos	int	184	IPv4 Type of Service (see IP_TOS option for IP) or IPv6 Traffic Class (see IPV6_TCLASS of IPv6) depending on socket address family. Applies to sender only. Default: 0xB8 Range: minimum 0; maximum 255.
inputbw	int	0	Sender nominal input rate. Used along with OHEADBW, when MAXBW is set to relative (0), to calculate maximum sending rate when recovery packets are sent along with main media stream (INPUTBW × (100 + OHEADBW) / 100). If INPUTBW is not set while MAXBW is set to relative (0), the actual input rate is evaluated inside the library Range: minimum 0.
oheadbw	int	25	Recovery bandwidth overhead above input rate (see SRTO_INPUTBW). Sender: user configurable, default: 25% Range: minimum 5; maximum 100.
latency	int	0	Set both receive and peer latency. Microseconds on the default FFmpeg SRT transport (srt.force_ffmpeg=true), milliseconds on the native SDK transport (srt.force_ffmpeg=false). Range: minimum 0.
tsbpddelay	string		FFmpeg SRT transport only (srt.force_ffmpeg=true). deprecated, same effect as latency option (from -1 to I64_MAX) (default -1)
tlpktdrop	bool	true	Too-late Packet Drop. When enabled on receiver, it skips missing packets that have not been delivered in time and delivers the subsequent packets to the application when their time-to-play has come. It also sends a fake ACK to the sender. When enabled on sender and enabled on the receiving peer, sender drops the older packets that have no chance to be delivered in time. It is automatically enabled in sender if receiver supports it
snddropdelay	int		The sender's extra delay before dropping packets. -1 disables packet dropping. Microseconds on the default FFmpeg SRT transport (srt.force_ffmpeg=true), milliseconds on the native SDK transport (srt.force_ffmpeg=false).
nakreport	bool	true	When set to true, Receiver will send UMSG_LOSSREPORT messages periodically until the lost packet is retransmitted or intentionally dropped
conntimeo	int	3000	Native SRT transport only (srt.force_ffmpeg=false). Connection timeout in milliseconds. The default FFmpeg transport uses connect_timeout in the URL instead.
lossmaxttl	int	0	The value up to which the Reorder Tolerance may grow. When Reorder Tolerance is > 0, then packet loss report is delayed until that number of packets come in. Reorder Tolerance increases every time a "belated" packet has come, but it wasn't due to retransmission (that is, when UDP packets tend to come out of order), with the difference between the latest sequence and this packet's sequence, and not more than the value of this option. By default it's 0, which means that this mechanism is turned off, and the loss report is always sent immediately upon experiencing a "gap" in sequences
rcvlatency	int	0	The time that should elapse since the moment when the packet was sent and the moment when it's delivered to the receiver application in the receiving function. This time should be a buffer time large enough to cover the time spent for sending, unexpectedly extended RTT time, and the time needed to retransmit the lost UDP packet. The effective latency value will be the maximum of this options' value and the value of SRTO_PEERLATENCY set by the peer side Units: microseconds on the default FFmpeg SRT transport (srt.force_ffmpeg=true), milliseconds on the native SDK transport (srt.force_ffmpeg=false). Range: minimum 0.
peerlatency	int	0	Minimum receive latency advertised to the peer. Microseconds on the default FFmpeg SRT transport (srt.force_ffmpeg=true), milliseconds on the native SDK transport (srt.force_ffmpeg=false). Range: minimum 0.
minversion	int	0	The minimum SRT version that is required from the peer. A connection to a peer that does not satisfy the minimum version requirement will be rejected
streamid	string		A string limited to 512 characters that can be set on the socket prior to connecting. This stream ID will be able to be retrieved by the listener side from the socket that is returned from srt_accept and was connected by a socket with that set stream ID. SRT does not enforce any special interpretation of the contents of this string. As this uses internally the std::string type, there are additional functions for it in the legacy/C++ API (udt.h): UDT::setstreamid and UDT::getstreamid. This option doesn’t make sense in Rendezvous connection; the result might be that simply one side will override the value from the other side and it’s the matter of luck which one would win
smoother	string		FFmpeg SRT transport only (srt.force_ffmpeg=true). The type of Smoother used for the transmission for that socket, which is responsible for the transmission and congestion control. The Smoother type must be exactly the same on both connecting parties, otherwise the connection is rejected
messageapi	bool	true	When set, this socket uses the Message API[*], otherwise it uses Buffer API. Note that in live mode (see SRTO_TRANSTYPE option) there’s only message API available
payloadsize	int	1316	Sets the maximum declared size of a single call to sending function in Live mode. Use 0 if this value isn't used (which is default in file mode). This value shall not be exceeded for a single data sending instruction in Live mode/ Range: up to MTUsize-28-16, usually 1456
transtype	option_fixed		Sets the transmission type for the socket, in particular, setting this option sets multiple other parameters to their default values as required for a particular transmission type. Type: enum. Default: SRTT_LIVE. Range: SRTT_FILE Supported values: `live`, `file`.
kmrefreshrate	int		The number of packets to be transmitted after which the encryption key is switched to a new key. Default is -1. -1 means auto (0x1000000 in srt library). The range for this option is integers in the 0 - INT_MAX
kmpreannounce	int		The interval between when a new encryption key is sent and when switchover occurs. This value also applies to the subsequent interval between when switchover occurs and when the old encryption key is decommissioned. Default is -1. -1 means auto (0x1000 in srt library). The range for this option is integers in the 0 - INT_MAX
split_channels	option_fixed	0	Split the overall audio channel into individual audio tracks, where each track contains a specific number of channels specified by the split_channels property. For example, if you record an input source with 12 audio channels and split_channels='4', you will get 3 audio tracks, each containing 4 audio channels Supported values: `0`, `1`, `2`, `4`, `6`, `8`.
embed_tc	bool	false	Enable embedding Time Code into elementary video stream (for H.264 video only)
embed_cc	bool	false	Enable embedding Closed Captions (ATSC) into elementary video stream
embed_scte35	bool	false	Enable embedding SCTE-35 triggers into MPEG transport stream
mpegts_transport_stream_id	int	1	Set the transport_stream_id. This identifies a transponder in DVB. Default is 0x0001 Range: minimum 1.0; maximum 65535.0.
mpegts_original_network_id	int	65281	Set the original_network_id. This is unique identifier of a network in DVB. Its main use is in the unique identification of a service through the path Original_Network_ID, Transport_Stream_ID Range: minimum 1.0; maximum 65535.0.
mpegts_service_id	int	1	Set the service_id, also known as program in DVB. Default is 0x0001 Range: minimum 1.0; maximum 65535.0.
mpegts_service_type	option	digital_tv	Set service_type field. Digital TelevisionDigital RadioTeletextAdvanced Codec Digital RadioMPEG2 Digital HDTVAdvanced Codec Digital SDTVAdvanced Codec Digital HDTVHEVC Digital Television Service Supported values: `digital_tv`, `digital_radio`, `teletext`, `advanced_codec_digital_radio`, `mpeg2_digital_hdtv`, `advanced_codec_digital_sdtv`, `advanced_codec_digital_hdtv`, `hevc_digital_hdtv`.
mpegts_pmt_start_pid	int	4096	Set the first PID for PMTs. Default is 0x1000, minimum is 0x0020, maximum is 0x1ffa. This option has no effect in m2ts mode where the PMT PID is fixed 0x0100 Range: minimum 32; maximum 8186.
mpegts_start_pid	int	256	Set the first PID for elementary streams. Default is 0x0100, minimum is 0x0020, maximum is 0x1ffa. This option has no effect in m2ts mode where the elementary stream PIDs are fixed Range: minimum 32; maximum 8186.
mpegts_m2ts_mode	option_fixed		Enable M2TS mode. auto enables it when the file extension is .m2ts (FFmpeg default auto). Supported values: `auto`, `false`, `true`.
muxrate	int	1	Set a constant muxrate. Default is VBR Range: minimum 0; maximum 2147483647.
pes_payload_size	int	2930	Set minimum PES packet payload in bytes. Default is 2930 Range: minimum 0.0; maximum 2147483647.
mpegts_flags	flags		MPEG-TS muxing flags Reemit PAT/PMT before writing the next packetUse LATM packetization for AACReemit PAT and PMT at each video frameConform to System B (DVB) instead of System A (ATSC)Mark initial packets as discontinuous Supported values: `resend_headers`, `latm`, `pat_pmt_at_frames`, `system_b`, `initial_discontinuity`, `nit`, `omit_rai`. `nit`: Enable NIT transmission `omit_rai`: Disable writing of random access indicator
mpegts_copyts	option_fixed		Do not offset DTS/PTS by max_delay; auto and false offset them (FFmpeg default auto). Supported values: `auto`, `false`, `true`.
tables_version	int	0	Set PAT, PMT, SDT and NIT version (default 0, valid values are from 0 to 31, inclusively). This option allows updating stream structure so that standard consumer may detect the change
omit_video_pes_length	option_fixed		Omit the PES packet length for video packets Supported values: `false`, `true`.
pcr_period	int	20	Override the PCR retransmission interval in milliseconds. The SDK preset default is 20 ms. Set -1 for automatic selection: 20 ms for CBR streams, or the highest multiple of the frame duration below 100 ms for VBR streams. Range: minimum -1; maximum 2147483647.
pat_period	double		PAT/PMT retransmission time limit in seconds Range: minimum 0.0.
sdt_period	double		Maximum time in seconds between SDT tables
cc_language	string	und	ISO 639-2 language of one configured digital caption service advertised in PMT when embed_cc is enabled. Empty or invalid values use und. No automatic service detection or caption encoding conversion. Supported video: H.264, MPEG-2 and MPEG-4; no descriptor in M2TS/BDAV; unsupported video codecs produce a warning
cc_service	int	1	CEA-708 caption service number advertised in PMT Range: minimum 1; maximum 63.
cc_korean_code	bool	true	Korean extension per KCS.KO-07.0093 (2013), section 4.2, Table 4.7: false for KS X 1001, true for Unicode when cc_language=kor. For other languages the A/65 reserved bit remains 1. Signalling only; caption bytes are not converted
cc_easy_reader	bool	false	CEA-708 caption service easy-reader flag
cc_wide_aspect	bool	true	CEA-708 caption service wide-aspect-ratio flag
scte35_pid	int	-1	Set SCTE-35 stream PID. Use -1 for automatic PID assignment
nit_period	string		NIT retransmission time limit in seconds (default 3)
tdt_period	string		TDT retransmission time limit in seconds (default 10)
eit_period	string		EIT present/following retransmission time limit in seconds (default 0.5)
dvb	option_fixed		DVB compatible MPEG-TS (NIT on, PAT/PMT not forced at video frames). Supported values: `false`, `true`.
start_pcr	double		Set the start PCR value in seconds (from 0 to INT_MAX) (default 0)
mininputbw	string		Native SRT transport only (srt.force_ffmpeg=false). Minimum input bandwidth in bytes per second for automatic input bandwidth estimation.
tsbpdmode	option_fixed		Enable timestamp-based packet delivery in the native SRT transport. Supported values: `false`, `true`.
drifttracer	option_fixed		Enable native SRT clock-drift correction. Supported values: `false`, `true`.
congestion	option_fixed		Native SRT congestion controller: live or file. Requires the native SRT transport; replaces the obsolete smoother name. Supported values: `live`, `file`.
enforcedencryption	option_fixed		Native SRT transport only (srt.force_ffmpeg=false); the FFmpeg transport uses enforced_encryption. Reject a peer whose encryption settings do not match. Supported values: `false`, `true`.
ipv6only	int		IPv6-only socket mode: -1 keeps the system default, 0 allows dual stack, 1 enables IPv6 only.
peeridletimeo	int		Peer idle timeout in milliseconds for the native SRT transport.
packetfilter	string		Native SRT packet-filter configuration string, for example FEC options.
retransmitalgo	int		Native SRT retransmission algorithm selector; supported values depend on the bundled SRT library.
mode	option		SRT connection mode. The writer defaults to caller. Supported values: `caller`, `listener`, `rendezvous`. `listener`: listener `rendezvous`: rendezvous
adapter	string		Local interface address used by the native SRT connection.
linger	int		SRT socket linger time in seconds, both transports. -1 keeps the library default. Range: minimum -1; maximum 2147483647.
srt.force_ffmpeg	option_fixed		Writer object property: set it with PropsSet on MFWriter/MWriter; the object property replaces a value in the format options. true (default): FFmpeg SRT transport, latency in microseconds; false: native SDK SRT transport, latency in milliseconds. Supported values: `false`, `true`.
timeout	string		FFmpeg SRT transport only (srt.force_ffmpeg=true). Timeout of socket I/O operations (in microseconds) (from -1 to I64_MAX) (default -1)
listen_timeout	string		FFmpeg SRT transport only (srt.force_ffmpeg=true). Connection awaiting timeout (in microseconds) (from -1 to I64_MAX) (default -1)
send_buffer_size	int		FFmpeg SRT transport only (srt.force_ffmpeg=true). Socket send buffer size (in bytes) (from -1 to INT_MAX) (default -1)
recv_buffer_size	int		FFmpeg SRT transport only (srt.force_ffmpeg=true). Socket receive buffer size (in bytes) (from -1 to INT_MAX) (default -1)
pkt_size	option		FFmpeg SRT transport only (srt.force_ffmpeg=true). Maximum SRT packet size (from -1 to 1456) (default -1) Supported values: `ts_size`, `max_size`. `ts_size`: 1316: ts_size `max_size`: 1456: max_size
payload_size	option		FFmpeg SRT transport only (srt.force_ffmpeg=true). Maximum SRT packet size (from -1 to 1456) (default -1) Supported values: `ts_size`, `max_size`. `ts_size`: 1316: ts_size `max_size`: 1456: max_size
enforced_encryption	option_fixed		FFmpeg SRT transport only (srt.force_ffmpeg=true). Enforces that both connection parties have the same passphrase set (default auto) Supported values: `auto`, `false`, `true`.
ffs	int		FFmpeg SRT transport only (srt.force_ffmpeg=true). Flow-control window (SRTO_FC) in packets (from -1 to INT_MAX; default -1).
connect_timeout	string		FFmpeg SRT transport (srt.force_ffmpeg=true, the writer default). Connect timeout in milliseconds. The writer adds connect_timeout=10000 to the srt:// URL unless the URL already has it; the URL value overrides this property. Set it in the URL, e.g. srt://host:port?connect_timeout=5000.
srt_streamid	string		FFmpeg SRT transport only (srt.force_ffmpeg=true). A string of up to 512 characters that an Initiator can pass to a Responder
tsbpd	option_fixed		Timestamp-based packet delivery (default auto). Both transports; the native transport reacts only to false. Supported values: `auto`, `false`, `true`.
localip	string		FFmpeg SRT transport only (srt.force_ffmpeg=true). localip desc
packetsize	int		set packet size (from 0 to INT_MAX) (default 0)
fflags	flags		FFmpeg fflags option. (default autobsf) Supported values: `flush_packets`, `bitexact`, `autobsf`. `flush_packets`: reduce the latency by flushing out packets immediately `bitexact`: do not write random/volatile data `autobsf`: add needed bsfs automatically
fdebug	flags		print specific debug info (default 0) Supported values: `ts`, `id3v2`. `ts`: ts `id3v2`: id3v2
max_delay	int		maximum muxing or demuxing delay in microseconds (from -1 to INT_MAX) (default -1)
start_time_realtime	string		wall-clock time when stream begins (PTS==0) (from I64_MIN to I64_MAX) (default I64_MIN)
audio_preload	int		microseconds by which audio packets should be interleaved earlier (from 0 to 2.14748e+09) (default 0)
chunk_duration	int		microseconds for each chunk (from 0 to 2.14748e+09) (default 0)
chunk_size	int		size in bytes for each chunk (from 0 to 2.14748e+09) (default 0)
flush_packets	int		enable flushing of the I/O context after each packet (from -1 to 1) (default -1)
metadata_header_padding	int		set number of bytes to be written as padding in a metadata header (from -1 to INT_MAX) (default -1)
output_ts_offset	string		set output timestamp offset (default 0)
max_interleave_delta	string		maximum buffering duration for interleaving (from 0 to I64_MAX) (default 10000000)
f_strict	option		how strictly to follow the standards (deprecated; use strict, save via avconv) (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
strict	option		how strictly to follow the standards (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
avoid_negative_ts	option		shift timestamps so they start at 0 (from -1 to 2) (default auto) Supported values: `auto`, `disabled`, `make_non_negative`, `make_zero`. `auto`: -1: enabled when required by target format `disabled`: 0: do not change timestamps `make_non_negative`: 1: shift timestamps so they are non negative `make_zero`: 2: shift timestamps so they start at 0

Video codecs

Default format codec
AV1 (FFmpeg VPL-MSDK, HW)
H.264 AVC (AMD AMF, HW)
H.264 AVC (Cisco OpenH264, SW)
H.264 AVC (FFmpeg VPL-MSDK, HW)
H.264 AVC (Intel QuickSync, SW)
H.264 AVC (Intel QuickSync, HW)
H.264 AVC (libx264, SW)
H.264 AVC (NVIDIA NVENC, HW)
H.264 AVC (NVIDIA NVENC Lossless, HW)
H.265 HEVC (AMD AMF, HW)
H.265 HEVC (FFmpeg VPL-MSDK, HW)
H.265 HEVC (Intel QuickSync, HW)
H.265 HEVC (NVIDIA NVENC, HW)
H.265 HEVC (NVIDIA NVENC Lossless, HW)
H.265 HEVC (x265, SW)
H.266 VVC (Fraunhofer VVenC, SW)
MPEG-2 Video (SW)
MPEG-4 Part 2 Video (ASP, SW)
Direct Stream Copy (No Re-Encoding)
No Video (Disabled)

Audio codecs

Default format codec
AAC (Advanced Audio Coding)
AC-3 (Dolby Digital, Floating-Point)
AC-3 (Dolby Digital, Fixed-Point)
MP2 (MPEG Audio Layer 2)
MP3 (LAME, MPEG Audio Layer 3)
Direct Stream Copy (No Re-Encoding)
No Audio (Disabled)

Video codec attributes

Default format codec

Name	Type	Default	Description
b	int	5M	Set video bitrate (in bits/s). Support unit prefixes such as K or M

Audio codec attributes

Default format codec

Name	Type	Default	Description
b	int	128000	Set audio bitrate (in bits/s). Support unit prefixes such as K

UDP Streaming (MPEG-TS)

Configuration Parameter: mpegts

Extensions: udp://

Additional attributes

Name	Type	Default	Description
split_channels	option_fixed	0	Split the overall audio channel into individual audio tracks, where each track contains a specific number of channels specified by the split_channels property. For example, if you record an input source with 12 audio channels and split_channels='4', you will get 3 audio tracks, each containing 4 audio channels Supported values: `0`, `1`, `2`, `4`, `6`, `8`.
embed_tc	bool	false	Enable embedding Time Code into elementary video stream (for H.264 video only)
embed_cc	bool	false	Enable embedding Closed Captions (ATSC) into elementary video stream
embed_scte35	bool	false	Enable embedding SCTE-35 triggers into MPEG transport stream
mpegts_transport_stream_id	int	1	Set the transport_stream_id. This identifies a transponder in DVB. Default is 0x0001 Range: minimum 1.0; maximum 65535.0.
mpegts_original_network_id	int	65281	Set the original_network_id. This is unique identifier of a network in DVB. Its main use is in the unique identification of a service through the path Original_Network_ID, Transport_Stream_ID Range: minimum 1.0; maximum 65535.0.
mpegts_service_id	int	1	Set the service_id, also known as program in DVB. Default is 0x0001 Range: minimum 1.0; maximum 65535.0.
mpegts_service_type	option	digital_tv	Set service_type field. Digital TelevisionDigital RadioTeletextAdvanced Codec Digital RadioMPEG2 Digital HDTVAdvanced Codec Digital SDTVAdvanced Codec Digital HDTVHEVC Digital Television Service Supported values: `digital_tv`, `digital_radio`, `teletext`, `advanced_codec_digital_radio`, `mpeg2_digital_hdtv`, `advanced_codec_digital_sdtv`, `advanced_codec_digital_hdtv`, `hevc_digital_hdtv`.
mpegts_pmt_start_pid	int	4096	Set the first PID for PMTs. Default is 0x1000, minimum is 0x0020, maximum is 0x1ffa. This option has no effect in m2ts mode where the PMT PID is fixed 0x0100 Range: minimum 32; maximum 8186.
mpegts_start_pid	int	256	Set the first PID for elementary streams. Default is 0x0100, minimum is 0x0020, maximum is 0x1ffa. This option has no effect in m2ts mode where the elementary stream PIDs are fixed Range: minimum 32; maximum 8186.
mpegts_m2ts_mode	option_fixed		Enable M2TS mode. auto enables it when the file extension is .m2ts (FFmpeg default auto). Supported values: `auto`, `false`, `true`.
muxrate	int	1	Set a constant muxrate. Default is VBR Range: minimum 0; maximum 2147483647.
pes_payload_size	int	2930	Set minimum PES packet payload in bytes. Default is 2930 Range: minimum 0.0; maximum 2147483647.
mpegts_flags	flags		MPEG-TS muxing flags Reemit PAT/PMT before writing the next packetUse LATM packetization for AACReemit PAT and PMT at each video frameConform to System B (DVB) instead of System A (ATSC)Mark initial packets as discontinuous Supported values: `resend_headers`, `latm`, `pat_pmt_at_frames`, `system_b`, `initial_discontinuity`, `nit`, `omit_rai`. `nit`: Enable NIT transmission `omit_rai`: Disable writing of random access indicator
mpegts_copyts	option_fixed		Do not offset DTS/PTS by max_delay; auto and false offset them (FFmpeg default auto). Supported values: `auto`, `false`, `true`.
tables_version	int	0	Set PAT, PMT, SDT and NIT version (default 0, valid values are from 0 to 31, inclusively). This option allows updating stream structure so that standard consumer may detect the change
omit_video_pes_length	option_fixed		Omit the PES packet length for video packets Supported values: `false`, `true`.
pcr_period	int	20	Override the PCR retransmission interval in milliseconds. The SDK preset default is 20 ms. Set -1 for automatic selection: 20 ms for CBR streams, or the highest multiple of the frame duration below 100 ms for VBR streams. Range: minimum -1; maximum 2147483647.
pat_period	double		PAT/PMT retransmission time limit in seconds Range: minimum 0.0.
sdt_period	double		SDT retransmission time limit in seconds Range: minimum 0.0.
flush_packets	int	-1	Enable flushing of the I/O context after each packet Range: minimum -1; maximum 1.
cc_language	string	und	ISO 639-2 language of one configured digital caption service advertised in PMT when embed_cc is enabled. Empty or invalid values use und. No automatic service detection or caption encoding conversion. Supported video: H.264, MPEG-2 and MPEG-4; no descriptor in M2TS/BDAV; unsupported video codecs produce a warning
cc_service	int	1	CEA-708 caption service number advertised in PMT Range: minimum 1; maximum 63.
cc_korean_code	bool	true	Korean extension per KCS.KO-07.0093 (2013), section 4.2, Table 4.7: false for KS X 1001, true for Unicode when cc_language=kor. For other languages the A/65 reserved bit remains 1. Signalling only; caption bytes are not converted
cc_easy_reader	bool	false	CEA-708 caption service easy-reader flag
cc_wide_aspect	bool	true	CEA-708 caption service wide-aspect-ratio flag
scte35_pid	int	-1	Set SCTE-35 stream PID. Use -1 for automatic PID assignment
nit_period	string		NIT retransmission time limit in seconds (default 3)
tdt_period	string		TDT retransmission time limit in seconds (default 10)
eit_period	string		EIT present/following retransmission time limit in seconds (default 0.5)
dvb	option_fixed		DVB compatible MPEG-TS (NIT on, PAT/PMT not forced at video frames). Supported values: `false`, `true`.
start_pcr	double		Set the start PCR value in seconds (from 0 to INT_MAX) (default 0)
buffer_size	int		System data size (in bytes) (from -1 to INT_MAX) (default -1)
bitrate	string		Bits to send per second (from 0 to I64_MAX) (default 0)
burst_bits	string		Max length of bursts in bits (when using bitrate) (from 0 to I64_MAX) (default 0)
localport	int		Local port (from -1 to INT_MAX) (default -1)
local_port	int		Local port (from -1 to INT_MAX) (default -1)
localaddr	string		Local address
udplite_coverage	int		choose UDPLite head size which should be validated by checksum (from 0 to INT_MAX) (default 0)
pkt_size	int		Maximum UDP packet size (from -1 to INT_MAX) (default 1472)
reuse	option_fixed		explicitly allow reusing UDP sockets (default auto) Supported values: `auto`, `false`, `true`.
reuse_socket	option_fixed		explicitly allow reusing UDP sockets (default auto) Supported values: `auto`, `false`, `true`.
broadcast	option_fixed		explicitly allow or disallow broadcast destination (default false) Supported values: `false`, `true`.
ttl	int		Time to live (multicast only) (from 0 to 255) (default 16)
dscp	int		DSCP class for outgoing packets (from -1 to 63) (default -1)
connect	option_fixed		set if connect() should be called on socket (default false) Supported values: `false`, `true`.
sources	string		Source list
block	string		Block list
packetsize	int		set packet size (from 0 to INT_MAX) (default 0)
fflags	flags		FFmpeg fflags option. (default autobsf) Supported values: `flush_packets`, `bitexact`, `autobsf`. `flush_packets`: reduce the latency by flushing out packets immediately `bitexact`: do not write random/volatile data `autobsf`: add needed bsfs automatically
fdebug	flags		print specific debug info (default 0) Supported values: `ts`, `id3v2`. `ts`: ts `id3v2`: id3v2
max_delay	int		maximum muxing or demuxing delay in microseconds (from -1 to INT_MAX) (default -1)
start_time_realtime	string		wall-clock time when stream begins (PTS==0) (from I64_MIN to I64_MAX) (default I64_MIN)
audio_preload	int		microseconds by which audio packets should be interleaved earlier (from 0 to 2.14748e+09) (default 0)
chunk_duration	int		microseconds for each chunk (from 0 to 2.14748e+09) (default 0)
chunk_size	int		size in bytes for each chunk (from 0 to 2.14748e+09) (default 0)
metadata_header_padding	int		set number of bytes to be written as padding in a metadata header (from -1 to INT_MAX) (default -1)
output_ts_offset	string		set output timestamp offset (default 0)
max_interleave_delta	string		maximum buffering duration for interleaving (from 0 to I64_MAX) (default 10000000)
f_strict	option		how strictly to follow the standards (deprecated; use strict, save via avconv) (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
strict	option		how strictly to follow the standards (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
avoid_negative_ts	option		shift timestamps so they start at 0 (from -1 to 2) (default auto) Supported values: `auto`, `disabled`, `make_non_negative`, `make_zero`. `auto`: -1: enabled when required by target format `disabled`: 0: do not change timestamps `make_non_negative`: 1: shift timestamps so they are non negative `make_zero`: 2: shift timestamps so they start at 0

Video codecs

Default format codec
AV1 (FFmpeg VPL-MSDK, HW)
H.264 AVC (AMD AMF, HW)
H.264 AVC (Cisco OpenH264, SW)
H.264 AVC (FFmpeg VPL-MSDK, HW)
H.264 AVC (Intel QuickSync, SW)
H.264 AVC (Intel QuickSync, HW)
H.264 AVC (libx264, SW)
H.264 AVC (NVIDIA NVENC, HW)
H.264 AVC (NVIDIA NVENC Lossless, HW)
H.265 HEVC (AMD AMF, HW)
H.265 HEVC (FFmpeg VPL-MSDK, HW)
H.265 HEVC (Intel QuickSync, HW)
H.265 HEVC (NVIDIA NVENC, HW)
H.265 HEVC (NVIDIA NVENC Lossless, HW)
H.265 HEVC (x265, SW)
H.266 VVC (Fraunhofer VVenC, SW)
MJPEG (Motion JPEG, SW)
MPEG-2 Video (SW)
MPEG-4 Part 2 Video (ASP, SW)
Direct Stream Copy (No Re-Encoding)
No Video (Disabled)

Audio codecs

Default format codec
AAC (Advanced Audio Coding)
AC-3 (Dolby Digital, Floating-Point)
AC-3 (Dolby Digital, Fixed-Point)
MP2 (MPEG Audio Layer 2)
MP3 (LAME, MPEG Audio Layer 3)
Direct Stream Copy (No Re-Encoding)
No Audio (Disabled)

Video codec attributes

Default format codec

Name	Type	Default	Description
b	int	5M	Set video bitrate (in bits/s). Support unit prefixes such as K or M

Audio codec attributes

Default format codec

Name	Type	Default	Description
b	int	128000	Set audio bitrate (in bits/s). Support unit prefixes such as K

WAV (Wave Audio File)

Configuration Parameter: wav

Extensions: wav

Additional attributes

Name	Type	Description
write_bext	option_fixed	Write BEXT chunk. (default false) Supported values: `false`, `true`.
write_peak	option	Write Peak Envelope chunk. (from 0 to 2) (default off) Supported values: `off`, `on`, `only`. `off`: 0: Do not write peak chunk. `on`: 1: Append peak chunk after wav data. `only`: 2: Write only peak chunk, omit wav data.
rf64	option	Use RF64 header rather than RIFF for large files. (from -1 to 1) (default never) Supported values: `auto`, `always`, `never`. `auto`: -1: Write RF64 header if file grows large enough. `always`: 1: Always write RF64 header regardless of file size. `never`: 0: Never write RF64 header regardless of file size.
peak_block_size	int	Number of audio samples used to generate each peak frame. (from 0 to 65536) (default 256)
peak_format	int	The format of the peak envelope data (1: uint8, 2: uint16). (from 1 to 2) (default 2)
peak_ppv	int	Number of peak points per peak value (1 or 2). (from 1 to 2) (default 2)
packetsize	int	set packet size (from 0 to INT_MAX) (default 0)
fflags	flags	FFmpeg fflags option. (default autobsf) Supported values: `flush_packets`, `bitexact`, `autobsf`. `flush_packets`: reduce the latency by flushing out packets immediately `bitexact`: do not write random/volatile data `autobsf`: add needed bsfs automatically
fdebug	flags	print specific debug info (default 0) Supported values: `ts`, `id3v2`. `ts`: ts `id3v2`: id3v2
max_delay	int	maximum muxing or demuxing delay in microseconds (from -1 to INT_MAX) (default -1)
start_time_realtime	string	wall-clock time when stream begins (PTS==0) (from I64_MIN to I64_MAX) (default I64_MIN)
audio_preload	int	microseconds by which audio packets should be interleaved earlier (from 0 to 2.14748e+09) (default 0)
chunk_duration	int	microseconds for each chunk (from 0 to 2.14748e+09) (default 0)
chunk_size	int	size in bytes for each chunk (from 0 to 2.14748e+09) (default 0)
flush_packets	int	enable flushing of the I/O context after each packet (from -1 to 1) (default -1)
metadata_header_padding	int	set number of bytes to be written as padding in a metadata header (from -1 to INT_MAX) (default -1)
output_ts_offset	string	set output timestamp offset (default 0)
max_interleave_delta	string	maximum buffering duration for interleaving (from 0 to I64_MAX) (default 10000000)
f_strict	option	how strictly to follow the standards (deprecated; use strict, save via avconv) (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
strict	option	how strictly to follow the standards (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
avoid_negative_ts	option	shift timestamps so they start at 0 (from -1 to 2) (default auto) Supported values: `auto`, `disabled`, `make_non_negative`, `make_zero`. `auto`: -1: enabled when required by target format `disabled`: 0: do not change timestamps `make_non_negative`: 1: shift timestamps so they are non negative `make_zero`: 2: shift timestamps so they start at 0

Video codecs

No Video (Disabled)

Audio codecs

PCM 16-bit Signed LE
PCM 24-bit Signed LE
PCM 24-bit D-Cinema
PCM 32-bit Signed LE
PCM 32-bit Float LE

WebM (Web Media Container)

Configuration Parameter: webm

Extensions: webm

Additional attributes

Name	Type	Default	Description
reserve_index_space	int	0	Reserve a given amount of space (in bytes) at the beginning of the file for the index (cues) Range: minimum 0.0; maximum 2147483647.
cluster_size_limit	int	-1	Store at most the provided amount of bytes in a cluster. If not specified, the limit is set automatically to a sensible hardcoded fixed value Range: minimum -1.0; maximum 2147483647.
cluster_time_limit	int	-1	Store at most the provided number of milliseconds in a cluster. If not specified, the limit is set automatically to a sensible hardcoded fixed value Range: minimum -1.0.
dash	option_fixed		Create a WebM file conforming to WebM DASH specification. By default it is set to false Supported values: `false`, `true`.
dash_track_number	int	1	Track number for the DASH stream. By default it is set to 1 Range: minimum 1; maximum 2147483647.
live	option_fixed		Write files assuming it is a live stream. By default it is set to false Supported values: `false`, `true`.
allow_raw_vfw	option_fixed		Allow raw VFW mode. By default it is set to false Supported values: `false`, `true`.
write_crc32	option_fixed		Write a CRC32 element inside every Level 1 element. By default it is set to true. This option is ignored for WebM Supported values: `false`, `true`.
cues_to_front	option_fixed		move Cues (the index) to the front by shifting data if necessary (default false) Supported values: `false`, `true`.
flipped_raw_rgb	option_fixed		store raw RGB bitmaps in VFW mode in bottom-up mode (default false) Supported values: `false`, `true`.
default_mode	option		control how a track's FlagDefault is inferred (from 0 to 2) (default passthrough) Supported values: `infer`, `infer_no_subs`, `passthrough`. `infer`: 0: for each track type, mark each track of disposition default as default; if none exists, mark the first track as default `infer_no_subs`: 1: for each track type, mark each track of disposition default as default; for audio and video: if none exists, mark the first track as default `passthrough`: 2: use the disposition flag as-is
packetsize	int		set packet size (from 0 to INT_MAX) (default 0)
fflags	flags		FFmpeg fflags option. (default autobsf) Supported values: `flush_packets`, `bitexact`, `autobsf`. `flush_packets`: reduce the latency by flushing out packets immediately `bitexact`: do not write random/volatile data `autobsf`: add needed bsfs automatically
fdebug	flags		print specific debug info (default 0) Supported values: `ts`, `id3v2`. `ts`: ts `id3v2`: id3v2
max_delay	int		maximum muxing or demuxing delay in microseconds (from -1 to INT_MAX) (default -1)
start_time_realtime	string		wall-clock time when stream begins (PTS==0) (from I64_MIN to I64_MAX) (default I64_MIN)
audio_preload	int		microseconds by which audio packets should be interleaved earlier (from 0 to 2.14748e+09) (default 0)
chunk_duration	int		microseconds for each chunk (from 0 to 2.14748e+09) (default 0)
chunk_size	int		size in bytes for each chunk (from 0 to 2.14748e+09) (default 0)
flush_packets	int		enable flushing of the I/O context after each packet (from -1 to 1) (default -1)
metadata_header_padding	int		set number of bytes to be written as padding in a metadata header (from -1 to INT_MAX) (default -1)
output_ts_offset	string		set output timestamp offset (default 0)
max_interleave_delta	string		maximum buffering duration for interleaving (from 0 to I64_MAX) (default 10000000)
f_strict	option		how strictly to follow the standards (deprecated; use strict, save via avconv) (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
strict	option		how strictly to follow the standards (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
avoid_negative_ts	option		shift timestamps so they start at 0 (from -1 to 2) (default auto) Supported values: `auto`, `disabled`, `make_non_negative`, `make_zero`. `auto`: -1: enabled when required by target format `disabled`: 0: do not change timestamps `make_non_negative`: 1: shift timestamps so they are non negative `make_zero`: 2: shift timestamps so they start at 0

Video codecs

AV1 (NVIDIA NVENC, HW)
VP8 (Google, SW)
VP9 (Google, SW)

Audio codecs

Ogg Vorbis
No Audio (Disabled)

XDCAM MPEG IMX (MPEG-4 Container)

Configuration Parameter: mov

Extensions: mov

Additional attributes

Name	Type	Default	Description
split_channels	option_fixed	0	Split the overall audio channel into individual audio tracks, where each track contains a specific number of channels specified by the split_channels property. For example, if you record an input source with 12 audio channels and split_channels='4', you will get 3 audio tracks, each containing 4 audio channels Supported values: `0`, `1`, `2`, `4`, `6`, `8`.
scc_capture	option_fixed	true	Capture SCC Closed Captioning Supported values: `true`, `false`.
anc_capture	option_fixed	false	Capture ANC Closed Captioning Supported values: `true`, `false`.
embed_cc	bool	false	Enable embedding Closed Captions (ATSC) into elementary video stream
raw_video	string		MWriter only (legacy FFmpeg encoder): also write the encoded video stream to this file path
raw_audio	string		MWriter only (legacy FFmpeg encoder): also write the encoded audio stream of track 0 to this file path; raw_audio.N for track N
start_timecode	option	auto	Set start timecode for encoding. Possible values are: auto (default), disabled, local_time or a custom string like "10:00:00:00" Supported values: `auto`, `disabled`, `local_time`.
ignore_pts	option_fixed		MWriter only (legacy FFmpeg encoder): number video frames by a frame counter instead of the sample times Supported values: `false`, `true`.
movflags	flags		MOV muxer flags Fragment at video keyframesThis data is usually written at the end of the file, but it can be moved to the start for better playback by adding +faststart to the movflags Supported values: `frag_keyframe`, `faststart`, `cmaf`, `dash`, `default_base_moof`, `delay_moov`, `disable_chpl`, `empty_moov`, `frag_custom`, `frag_discont`, `frag_every_frame`, `global_sidx`, `isml`, `negative_cts_offsets`, `omit_tfhd_offset`, `prefer_icc`, `rtphint`, `separate_moof`, `skip_sidx`, `skip_trailer`, `use_metadata_tags`, `write_colr`, `write_gama`, `hybrid_fragmented`. `cmaf`: Write CMAF compatible fragmented MP4 `dash`: Write DASH compatible fragmented MP4 `default_base_moof`: Set the default-base-is-moof flag in tfhd atoms `delay_moov`: Delay writing the initial moov until the first fragment is cut, or until the first fragment flush `disable_chpl`: Disable Nero chapter atom `empty_moov`: Make the initial moov atom empty `frag_custom`: Flush fragments on caller requests `frag_discont`: Signal that the next fragment is discontinuous from earlier ones `frag_every_frame`: Fragment at every frame `global_sidx`: Write a global sidx index at the start of the file `isml`: Create a live smooth streaming feed (for pushing to a publishing point) `negative_cts_offsets`: Use negative CTS offsets (reducing the need for edit lists) `omit_tfhd_offset`: Omit the base data offset in tfhd atoms `prefer_icc`: If writing colr atom prioritise usage of ICC profile if it exists in stream packet side data `rtphint`: Add RTP hint tracks `separate_moof`: Write separate moof/mdat atoms for each track `skip_sidx`: Skip writing of sidx atom `skip_trailer`: Skip writing the mfra/tfra/mfro trailer for fragmented files `use_metadata_tags`: Use mdta atom for metadata. `write_colr`: Write colr atom even if the color info is unspecified (Experimental, may be renamed or changed, do not use from scripts) `write_gama`: Write deprecated gama atom `hybrid_fragmented`: For recoverability, write a fragmented file that is converted to non-fragmented at the end.
moov_size	int	0	Reserves space for the moov atom at the beginning of the file instead of placing the moov atom at the end. If the space reserved is insufficient, muxing will fail Range: minimum 0.0; maximum 2147483647.
skip_iods	int	1	Skip writing iods atom Range: minimum 0.0; maximum 1.0.
iods_audio_profile	int	-1	Specify iods number for the audio profile atom (from -1 to 255), default is -1
iods_video_profile	int	-1	Specify iods number for the video profile atom (from -1 to 255), default is -1
frag_duration	int	0	Create fragments that are duration microseconds long Range: minimum 0.0; maximum 2147483647.
min_frag_duration	int	0	Do not create fragments that are shorter than duration microseconds long Range: minimum 0.0; maximum 2147483647.
frag_size	int	0	Create fragments that contain up to size bytes of payload data Range: minimum 0.0; maximum 2147483647.
brand	string		Override major brand
empty_hdlr_name	option_fixed		write zero-length name string in hdlr atoms within mdia and minf atoms (default false) Supported values: `false`, `true`.
encryption_key	string		The media encryption key (hex)
encryption_kid	string		The media encryption key identifier (hex)
encryption_scheme	string		Configures the encryption scheme, allowed values are none, cenc-aes-ctr
frag_interleave	int		Interleave samples within fragments (max number of consecutive samples, lower is tighter interleaving, but with more overhead) (from 0 to INT_MAX) (default 0)
fragment_index	int		Fragment number of the next fragment. Range: minimum 1; maximum 2147483647.
ism_lookahead	int		Number of lookahead entries for ISM files (from 0 to 255) (default 0)
mov_gamma	double		gamma value for gama atom (from 0 to 10) (default 0)
movie_timescale	int		set movie timescale (from 0 to INT_MAX) (default 0)
rtpflags	flags		RTP muxer flags (default 0) Supported values: `latm`, `rfc2190`, `skip_rtcp`, `h264_mode0`, `send_bye`. `latm`: Use MP4A-LATM packetization instead of MPEG4-GENERIC for AAC `rfc2190`: Use RFC 2190 packetization instead of RFC 4629 for H.263 `skip_rtcp`: Don't send RTCP sender reports `h264_mode0`: Use mode 0 for H.264 in RTP `send_bye`: Send RTCP BYE packets when finishing
use_editlist	option_fixed		use edit list (default auto) Supported values: `auto`, `false`, `true`.
use_stream_ids_as_track_ids	option_fixed		use stream ids as track ids (default false) Supported values: `false`, `true`.
video_track_timescale	int		set timescale of all video tracks (from 0 to INT_MAX) (default 0)
write_btrt	option_fixed		force or disable writing btrt (default auto) Supported values: `auto`, `false`, `true`.
write_prft	option		Write producer reference time box with specified time source (from 0 to 2) (default 0) Supported values: `pts`, `wallclock`. `pts`: 2: pts `wallclock`: 1: wallclock
write_tmcd	option_fixed		force or disable writing tmcd (default auto) Supported values: `auto`, `false`, `true`.
packetsize	int		set packet size (from 0 to INT_MAX) (default 0)
fflags	flags		FFmpeg fflags option. (default autobsf) Supported values: `flush_packets`, `bitexact`, `autobsf`. `flush_packets`: reduce the latency by flushing out packets immediately `bitexact`: do not write random/volatile data `autobsf`: add needed bsfs automatically
fdebug	flags		print specific debug info (default 0) Supported values: `ts`, `id3v2`. `ts`: ts `id3v2`: id3v2
max_delay	int		maximum muxing or demuxing delay in microseconds (from -1 to INT_MAX) (default -1)
start_time_realtime	string		wall-clock time when stream begins (PTS==0) (from I64_MIN to I64_MAX) (default I64_MIN)
audio_preload	int		microseconds by which audio packets should be interleaved earlier (from 0 to 2.14748e+09) (default 0)
chunk_duration	int		microseconds for each chunk (from 0 to 2.14748e+09) (default 0)
chunk_size	int		size in bytes for each chunk (from 0 to 2.14748e+09) (default 0)
flush_packets	int		enable flushing of the I/O context after each packet (from -1 to 1) (default -1)
metadata_header_padding	int		set number of bytes to be written as padding in a metadata header (from -1 to INT_MAX) (default -1)
output_ts_offset	string		set output timestamp offset (default 0)
max_interleave_delta	string		maximum buffering duration for interleaving (from 0 to I64_MAX) (default 10000000)
f_strict	option		how strictly to follow the standards (deprecated; use strict, save via avconv) (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
strict	option		how strictly to follow the standards (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental variants
avoid_negative_ts	option		shift timestamps so they start at 0 (from -1 to 2) (default auto) Supported values: `auto`, `disabled`, `make_non_negative`, `make_zero`. `auto`: -1: enabled when required by target format `disabled`: 0: do not change timestamps `make_non_negative`: 1: shift timestamps so they are non negative `make_zero`: 2: shift timestamps so they start at 0

Video codecs

MPEG-2 Video 30Mbps
MPEG-2 Video 40Mbps
MPEG-2 Video 50Mbps
Direct Stream Copy (No Re-Encoding)
No Video (Disabled)

Audio codecs

PCM 16-bit Signed LE
PCM 24-bit Signed LE
Direct Stream Copy (No Re-Encoding)
No Audio (Disabled)

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