Formats and codecs for encoding

Formats

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

MPEG Program Stream

Configuration Parameter: mpeg

Extensions: mpg,mpeg

Additional attributes

Name	Type	Default	Description
split_channels	option_fixed	0	Split audio channels
scc_capture	option_fixed	true	Capture SCC Closed Captioning
anc_capture	option_fixed	false	Capture ANC Closed Captioning
embed_cc	bool	false	Enable embedding Closed Captions (ATSC) into elementary video stream
raw_video	string		Capture RAW video. Set target save path as value.
raw_audio	string		Capture RAW audio. Set target save path as value.
ignore_pts	string		Ignore video sample times. Possible values: true, false
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"
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.
preload	int	500000	Initial demux-decode delay in microseconds.

Video codecs

• MPEG-1 Video
• MPEG-2 Video
• libx264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
• Cisco OpenH264 Encoder
• Intel QuickSync SW H.264 Encoder
• Intel QuickSync HW H.264 Encoder
• Intel QuickSync HEVC Encoder
• NVIDIA NVEnc H.264 Encoder
• NVIDIA NVEnc H.264 Lossless Encoder
• NVIDIA NVEnc H.265 (HEVC) Encoder
• AMD AMF H.264 Encoder
• AMD AMF H.265 (HEVC) Encoder
• x265 H.265/HEVC
• MPEG-4 part 2 Video
• Direct stream copy
• No Video

Audio codecs

• MP2 (MPEG audio layer 2)
• MP3 Lame (MPEG audio layer 3)
• ATSC A/52A (AC-3)
• ATSC A/52A (AC-3) Fixed
• Direct stream copy
• No Audio

MPEG Transport Stream

Configuration Parameter: mpegts

Extensions: ts,m2t,m2ts,mts

Additional attributes

Name	Type	Default	Description
split_channels	option_fixed	0	Split audio channels
scc_capture	option_fixed	true	Capture SCC Closed Captioning
anc_capture	option_fixed	false	Capture ANC Closed Captioning
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		Capture RAW video. Set target save path as value.
raw_audio	string		Capture RAW audio. Set target save path as value.
ignore_pts	string		Ignore video sample times. Possible values: true, false
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"
mpegts_transport_stream_id	int	1	Set transport_stream_id field.
mpegts_original_network_id	int	65281	Set original_network_id field.
mpegts_service_id	int	1	Set service_id field.
mpegts_service_type	option	digital_tv	Set service_type field. 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.
mpegts_pmt_start_pid	int	4096	Set the first pid of the PMT.
mpegts_start_pid	int	256	Set the first pid.
mpegts_m2ts_mode			Enable m2ts mode.
muxrate	int	1
pes_payload_size	int	2930	Minimum PES packet payload in bytes
mpegts_flags	flags		MPEG-TS muxing flags resend_headers - Reemit PAT/PMT before writing the next packet latm - Use LATM packetization for AAC pat_pmt_at_frames - Reemit PAT and PMT at each video frame system_b - Conform to System B (DVB) instead of System A (ATSC) initial_discontinuity - Mark initial packets as discontinuous
resend_headers	int	0	Reemit PAT/PMT before writing the next packet
mpegts_copyts			don't offset dts/pts
tables_version	int	0	set PAT, PMT and SDT version
omit_video_pes_length			Omit the PES packet length for video packets
pcr_period	int	20	PCR retransmission time
pat_period	double	2147483647.000000	PAT/PMT retransmission time limit in seconds
sdt_period	double	2147483647.000000	SDT retransmission time limit in seconds

Video codecs

• MPEG-2 Video
• MPEG-4 part 2 Video
• libx264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
• Cisco OpenH264 Encoder
• Intel QuickSync SW H.264 Encoder
• Intel QuickSync HW H.264 Encoder
• Intel QuickSync HEVC Encoder
• NVIDIA NVEnc H.264 Encoder
• NVIDIA NVEnc H.264 Lossless Encoder
• NVIDIA NVEnc H.265 (HEVC) Encoder
• AMD AMF H.264 Encoder
• AMD AMF H.265 (HEVC) Encoder
• x265 H.265/HEVC
• Direct stream copy
• No Video

Audio codecs

• MP2 (MPEG audio layer 2)
• AAC (Advanced Audio Coding)
• MP3 Lame (MPEG audio layer 3)
• ATSC A/52A (AC-3)
• ATSC A/52A (AC-3) Fixed
• Direct stream copy
• No Audio

MP4 (MPEG-4 Part 14)

Configuration Parameter: mp4

Extensions: mp4

Additional attributes

Name	Type	Default	Description
split_channels	option_fixed	0	Split audio channels
scc_capture	option_fixed	true	Capture SCC Closed Captioning
anc_capture	option_fixed	false	Capture ANC Closed Captioning
embed_cc	bool	false	Enable embedding Closed Captions (ATSC) into elementary video stream
raw_video	string		Capture RAW video. Set target save path as value.
raw_audio	string		Capture RAW audio. Set target save path as value.
ignore_pts	string		Ignore video sample times. Possible values: true, false
movflags	flags		MOV muxer flags rtphint - Add RTP hint tracks empty_moov - Make the initial moov atom empty frag_keyframe - Fragment at video keyframes frag_every_frame - Fragment at every frame separate_moof - Write separate moof/mdat atoms for each track frag_custom - Flush fragments on caller requests isml - Create a live smooth streaming feed (for pushing to a publishing point) faststart - Run a second pass to put the index (moov atom) at the beginning of the file omit_tfhd_offset - Omit the base data offset in tfhd atoms disable_chpl - Disable Nero chapter atom default_base_moof - Set the default-base-is-moof flag in tfhd atoms dash - Write DASH compatible fragmented MP4 frag_discont - Signal that the next fragment is discontinuous from earlier ones delay_moov - Delay writing the initial moov until the first fragment is cut, or until the first fragment flush global_sidx - Write a global sidx index at the start of the file write_colr - Write colr atom (Experimental, may be renamed or changed, do not use from scripts) write_gama - Write deprecated gama atom use_metadata_tags - Use mdta atom for metadata. skip_trailer - Skip writing the mfra/tfra/mfro trailer for fragmented files negative_cts_offsets - Use negative CTS offsets (reducing the need for edit lists)
moov_size	int	0	maximum moov size so it can be placed at the begin
rtpflags	flags		RTP muxer flags 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			Skip writing iods atom.
iods_audio_profile	int	-1	iods audio profile atom.
iods_video_profile	int	-1	iods video profile atom.
frag_duration	int	0	Maximum fragment duration
min_frag_duration	int	0	Minimum fragment duration
frag_size	int	0	Maximum fragment size
ism_lookahead	int	0	Number of lookahead entries for ISM files
video_track_timescale	int	0	set timescale of all video tracks
brand	string		Override major brand
use_editlist			use edit list
fragment_index	int	1	Fragment number of the next fragment
mov_gamma	double	0.000000	gamma value for gama atom
frag_interleave	int	0	Interleave samples within fragments (max number of consecutive samples, lower is tighter interleaving, but with more overhead)
encryption_scheme	string		Configures the encryption scheme, allowed values are none, cenc-aes-ctr
encryption_key			The media encryption key (hex)
encryption_kid			The media encryption key identifier (hex)
use_stream_ids_as_track_ids			use stream ids as track ids
write_tmcd			force or disable writing tmcd
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

Video codecs

• MPEG-4 part 2 Video
• libx264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
• Cisco OpenH264 Encoder
• Intel QuickSync SW H.264 Encoder
• Intel QuickSync HW H.264 Encoder
• Intel QuickSync HEVC Encoder
• NVIDIA NVEnc H.264 Encoder
• NVIDIA NVEnc H.264 Lossless Encoder
• NVIDIA NVEnc H.265 (HEVC) Encoder
• AMD AMF H.264 Encoder
• AMD AMF H.265 (HEVC) Encoder
• x265 H.265/HEVC
• MPEG-2 Video
• MJPEG (Motion JPEG)
• MPEG-1 Video
• Direct stream copy
• No Video

Audio codecs

• AAC (Advanced Audio Coding)
• MP2 (MPEG audio layer 2)
• MP3 Lame (MPEG audio layer 3)
• ATSC A/52A (AC-3)
• ATSC A/52A (AC-3) Fixed
• Ogg Vorbis
• Direct stream copy
• No Audio

MOV (QuickTime File Format)

Configuration Parameter: mov

Extensions: mov

Additional attributes

Name	Type	Default	Description
split_channels	option_fixed	0	Split audio channels
scc_capture	option_fixed	true	Capture SCC Closed Captioning
anc_capture	option_fixed	false	Capture ANC Closed Captioning
embed_cc	bool	false	Enable embedding Closed Captions (ATSC) into elementary video stream
raw_video	string		Capture RAW video. Set target save path as value.
raw_audio	string		Capture RAW audio. Set target save path as value.
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"
ignore_pts	string		Ignore video sample times. Possible values: true, false
movflags	flags		MOV muxer flags rtphint - Add RTP hint tracks empty_moov - Make the initial moov atom empty frag_keyframe - Fragment at video keyframes frag_every_frame - Fragment at every frame separate_moof - Write separate moof/mdat atoms for each track frag_custom - Flush fragments on caller requests isml - Create a live smooth streaming feed (for pushing to a publishing point) faststart - Run a second pass to put the index (moov atom) at the beginning of the file omit_tfhd_offset - Omit the base data offset in tfhd atoms disable_chpl - Disable Nero chapter atom default_base_moof - Set the default-base-is-moof flag in tfhd atoms dash - Write DASH compatible fragmented MP4 frag_discont - Signal that the next fragment is discontinuous from earlier ones delay_moov - Delay writing the initial moov until the first fragment is cut, or until the first fragment flush global_sidx - Write a global sidx index at the start of the file write_colr - Write colr atom (Experimental, may be renamed or changed, do not use from scripts) write_gama - Write deprecated gama atom use_metadata_tags - Use mdta atom for metadata. skip_trailer - Skip writing the mfra/tfra/mfro trailer for fragmented files negative_cts_offsets - Use negative CTS offsets (reducing the need for edit lists)
moov_size	int	0	maximum moov size so it can be placed at the begin
rtpflags	flags		RTP muxer flags 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			Skip writing iods atom.
iods_audio_profile	int	-1	iods audio profile atom.
iods_video_profile	int	-1	iods video profile atom.
frag_duration	int	0	Maximum fragment duration
min_frag_duration	int	0	Minimum fragment duration
frag_size	int	0	Maximum fragment size
ism_lookahead	int	0	Number of lookahead entries for ISM files
video_track_timescale	int	0	set timescale of all video tracks
brand	string		Override major brand
use_editlist			use edit list
fragment_index	int	1	Fragment number of the next fragment
mov_gamma	double	0.000000	gamma value for gama atom
frag_interleave	int	0	Interleave samples within fragments (max number of consecutive samples, lower is tighter interleaving, but with more overhead)
encryption_scheme	string		Configures the encryption scheme, allowed values are none, cenc-aes-ctr
encryption_key			The media encryption key (hex)
encryption_kid			The media encryption key identifier (hex)
use_stream_ids_as_track_ids			use stream ids as track ids
write_tmcd			force or disable writing tmcd
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

Video codecs

• MPEG-4 part 2 Video
• libx264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
• Cisco OpenH264 Encoder
• Intel QuickSync SW H.264 Encoder
• Intel QuickSync HW H.264 Encoder
• Intel QuickSync HEVC Encoder
• NVIDIA NVEnc H.264 Encoder
• NVIDIA NVEnc H.264 Lossless Encoder
• NVIDIA NVEnc H.265 (HEVC) Encoder
• AMD AMF H.264 Encoder
• AMD AMF H.265 (HEVC) Encoder
• x265 H.265/HEVC
• MPEG-2 Video
• DV Video / DVCPRO-HD
• MJPEG (Motion JPEG)
• FLV / Sorenson Spark / Sorenson H.263 (Flash Video)
• HuffYUV
• FFV1
• MPEG-1 Video
• Windows Media Video 8
• Apple ProRes proxy
• Apple ProRes 422 (LT)
• Apple ProRes 422
• Apple ProRes 422 (HQ)
• QuickTime Animation (RLE) video
• Uncompressed 4:2:2 8bit
• Uncompressed 4:2:2 10bit
• Direct stream copy
• No Video

Audio codecs

• AAC (Advanced Audio Coding)
• MP2 (MPEG audio layer 2)
• MP3 Lame (MPEG audio layer 3)
• ATSC A/52A (AC-3)
• ATSC A/52 E-AC-3
• (Uncompressed) PCM signed 16-bit little-endian
• (Uncompressed) PCM signed 24-bit little-endian
• (Uncompressed) PCM signed 32-bit little-endian
• (Uncompressed) PCM 32-bit floating point little-endian
• ALAC (Apple Lossless Audio Codec)
• ADPCM IMA QuickTime
• ATSC A/52A (AC-3) Fixed
• Ogg Vorbis
• ADPCM Microsoft
• Direct stream copy
• No Audio

MOV DNxHD

Configuration Parameter: mov_dnxhd

Extensions: mov

Additional attributes

Name	Type	Default	Description
split_channels	option_fixed	0	Split audio channels
scc_capture	option_fixed	true	Capture SCC Closed Captioning
anc_capture	option_fixed	false	Capture ANC Closed Captioning
raw_video	string		Capture RAW video. Set target save path as value.
raw_audio	string		Capture RAW audio. Set target save path as value.
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"
ignore_pts	string		Ignore video sample times. Possible values: true, false
movflags	flags		MOV muxer flags frag_keyframe - Fragment at video keyframes faststart - Run a second pass to put the moov at the beginning of the file
moov_size	int	0	Maximum moov size so it can be placed at the begin
skip_iods	int	1	Skip writing iods atom.
iods_audio_profile	int	-1	Iods audio profile atom.
iods_video_profile	int	-1	Iods video profile atom.
frag_duration	int	0	Maximum fragment duration
min_frag_duration	int	0	Minimum fragment duration
frag_size	int	0	Maximum fragment size
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

Video codecs

• DNxHD 1080 60p 440M
• DNxHD 1080 60p 290M
• DNxHD 1080 60p 90M
• DNxHD 1080 59p 440M
• DNxHD 1080 59p 290M
• DNxHD 1080 59p 90M
• DNxHD 1080 50p 365M
• DNxHD 1080 50p 240M
• DNxHD 1080 50p 75M
• DNxHD 1080 59i 220M
• DNxHD 1080 59i 145M
• DNxHD 1080 50i 185M
• DNxHD 1080 50i 120M
• DNxHD 1080 25p 185M
• DNxHD 1080 25p 120M
• DNxHD 1080 25p 36M
• DNxHD 1080 24p 175M
• DNxHD 1080 24p 115M
• DNxHD 1080 24p 36M
• DNxHD 1080 23p 175M
• DNxHD 1080 23p 115M
• DNxHD 1080 23p 36M
• DNxHD 1080 29p 220M
• DNxHD 1080 29p 145M
• DNxHD 1080 29p 45M
• DNxHD 720 59p 220M
• DNxHD 720 59p 145M
• DNxHD 720 50p 60M
• DNxHD 720 25p 90M
• DNxHR LB - Low Bandwidth (8-bit 4:2:2)
• DNxHR SQ - Standard Quality (8-bit 4:2:2)
• DNxHR HQ - High Quality (8-bit 4:2:2)
• No Video

Audio codecs

• AAC (Advanced Audio Coding)
• MP2 (MPEG audio layer 2)
• MP3 Lame (MPEG audio layer 3)
• ATSC A/52A (AC-3)
• ATSC A/52 E-AC-3
• (Uncompressed) PCM signed 16-bit little-endian
• (Uncompressed) PCM signed 24-bit little-endian
• (Uncompressed) PCM signed 32-bit little-endian
• (Uncompressed) PCM 32-bit floating point little-endian
• ALAC (Apple Lossless Audio Codec)
• ADPCM IMA QuickTime
• ATSC A/52A (AC-3) Fixed
• Ogg Vorbis
• ADPCM Microsoft
• No Audio

XDCAM - MPEG IMX (MPEG-4 container)

Configuration Parameter: mov

Extensions: mov

Additional attributes

Name	Type	Default	Description
split_channels	option_fixed	0	Split audio channels
scc_capture	option_fixed	true	Capture SCC Closed Captioning
anc_capture	option_fixed	false	Capture ANC Closed Captioning
embed_cc	bool	false	Enable embedding Closed Captions (ATSC) into elementary video stream
raw_video	string		Capture RAW video. Set target save path as value.
raw_audio	string		Capture RAW audio. Set target save path as value.
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"
ignore_pts	string		Ignore video sample times. Possible values: true, false
movflags	flags		MOV muxer flags frag_keyframe - Fragment at video keyframes faststart - Run a second pass to put the moov at the beginning of the file
moov_size	int	0	Maximum moov size so it can be placed at the begin
skip_iods	int	1	Skip writing iods atom.
iods_audio_profile	int	-1	Iods audio profile atom.
iods_video_profile	int	-1	Iods video profile atom.
frag_duration	int	0	Maximum fragment duration
min_frag_duration	int	0	Minimum fragment duration
frag_size	int	0	Maximum fragment size

Video codecs

• MPEG-2 Video 30Mbps
• MPEG-2 Video 40Mbps
• MPEG-2 Video 50Mbps
• Direct stream copy
• No Video

Audio codecs

• (Uncompressed) PCM signed 16-bit little-endian
• (Uncompressed) PCM signed 24-bit little-endian
• Direct stream copy
• No Audio

MXF (Material eXchange Format)

Configuration Parameter: mxf

Extensions: mxf

Additional attributes

Name	Type	Default	Description
split_channels	option_fixed	0	Split audio channels
scc_capture	option_fixed	true	Capture SCC Closed Captioning
anc_capture	option_fixed	false	Capture ANC Closed Captioning
embed_cc	bool	false	Enable embedding Closed Captions (ATSC) into elementary video stream (only for MPEG-2 video)
raw_video	string		Capture RAW video. Set target save path as value.
raw_audio	string		Capture RAW audio. Set target save path as value.
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"
ignore_pts	string		Ignore video sample times. Possible values: true, false

Video codecs

• MPEG-2 Video
• DV Video / DVCPRO-HD
• VC3/DNxHD 1080
• VC3/DNxHD 720
• Direct stream copy
• No Video

Audio codecs

• (Uncompressed) PCM signed 16-bit little-endian
• (Uncompressed) PCM signed 24-bit little-endian
• Direct stream copy
• No Audio

MXF D-10 (Material eXchange Format D-10 Mapping)

Configuration Parameter: mxf_d10

Extensions: mxf

Additional attributes

Name	Type	Default	Description
split_channels	option_fixed	0	Split audio channels
scc_capture	option_fixed	true	Capture SCC Closed Captioning
anc_capture	option_fixed	false	Capture ANC Closed Captioning
embed_cc	bool	false	Enable embedding Closed Captions (ATSC) into elementary video stream
raw_video	string		Capture RAW video. Set target save path as value.
raw_audio	string		Capture RAW audio. Set target save path as value.
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"
ignore_pts	string		Ignore video sample times. Possible values: true, false

Video codecs

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

Audio codecs

• (Uncompressed) PCM signed 16-bit little-endian
• (Uncompressed) PCM signed 24-bit little-endian
• Direct stream copy
• No Audio

GXF (General eXchange Format)

Configuration Parameter: gxf

Extensions: gxf

Additional attributes

Name	Type	Default	Description
split_channels	option_fixed	0	Split audio channels
scc_capture	option_fixed	true	Capture SCC Closed Captioning
anc_capture	option_fixed	false	Capture ANC Closed Captioning
embed_cc	bool	false	Enable embedding Closed Captions (ATSC) into elementary video stream
raw_video	string		Capture RAW video. Set target save path as value.
raw_audio	string		Capture RAW audio. Set target save path as value.
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"
ignore_pts	string		Ignore video sample times. Possible values: true, false

Video codecs

• MPEG-2 Video PAL
• MPEG-2 Video NTSC

Audio codecs

• (Uncompressed) PCM signed 16-bit little-endian
• No Audio

DV (Digital Video)

Configuration Parameter: dv

Extensions: dv

Additional attributes

Name	Type	Default	Description
split_channels	option_fixed	0	Split audio channels
scc_capture	option_fixed	true	Capture SCC Closed Captioning
anc_capture	option_fixed	false	Capture ANC Closed Captioning
raw_video	string		Capture RAW video. Set target save path as value.
raw_audio	string		Capture RAW audio. Set target save path as value.
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"
ignore_pts	string		Ignore video sample times. Possible values: true, false

Video codecs

• DV (Digital Video)

Audio codecs

• (Uncompressed) PCM signed 16-bit little-endian
• No Audio

FLV (Flash Video)

Configuration Parameter: flv

Extensions: flv

Additional attributes

Name	Type	Default	Description
split_channels	option_fixed	0	Split audio channels
scc_capture	option_fixed	true	Capture SCC Closed Captioning
anc_capture	option_fixed	false	Capture ANC Closed Captioning
raw_video	string		Capture RAW video. Set target save path as value.
raw_audio	string		Capture RAW audio. Set target save path as value.
ignore_pts	string		Ignore video sample times. Possible values: true, false

Video codecs

• FLV / Sorenson Spark / Sorenson H.263 (Flash Video)
• libx264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
• Cisco OpenH264 Encoder
• Intel QuickSync SW H.264 Encoder
• Intel QuickSync HW H.264 Encoder
• NVIDIA NVEnc H.264 Encoder
• NVIDIA NVEnc H.264 Lossless Encoder
• AMD AMF H.264 Encoder
• No Video

Audio codecs

• AAC (Advanced Audio Coding)
• (Uncompressed) PCM signed 16-bit little-endian 44100Hz
• (Uncompressed) PCM signed 16-bit little-endian 22050Hz
• No Audio

DVD Video (VOB-Files)

Configuration Parameter: vob

Extensions: vob

Additional attributes

Name	Type	Default	Description
split_channels	option_fixed	0	Split audio channels
scc_capture	option_fixed	true	Capture SCC Closed Captioning
anc_capture	option_fixed	false	Capture ANC Closed Captioning
embed_cc	bool	false	Enable embedding Closed Captions (ATSC) into elementary video stream (only for MPEG-2, MPEG-4, H.264 video)
raw_video	string		Capture RAW video. Set target save path as value.
raw_audio	string		Capture RAW audio. Set target save path as value.
ignore_pts	string		Ignore video sample times. Possible values: true, false
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.
preload	int	500000	Initial demux-decode delay in microseconds.

Video codecs

• MPEG-2 Video
• libx264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
• Cisco OpenH264 Encoder
• Intel QuickSync SW H.264 Encoder
• Intel QuickSync HW H.264 Encoder
• Intel QuickSync HEVC Encoder
• NVIDIA NVEnc H.264 Encoder
• NVIDIA NVEnc H.264 Lossless Encoder
• NVIDIA NVEnc H.265 (HEVC) Encoder
• AMD AMF H.264 Encoder
• AMD AMF H.265 (HEVC) Encoder
• x265 H.265/HEVC
• MPEG-1 Video
• MPEG-4 part 2 Video
• No Video

Audio codecs

• MP2 (MPEG audio layer 2)
• MP3 Lame (MPEG audio layer 3)
• ATSC A/52A (AC-3)
• ATSC A/52A (AC-3) Fixed
• No Audio

ASF (Advanced / Active Streaming Format)

Configuration Parameter: asf

Extensions: asf,wmv,wma

Additional attributes

Name	Type	Default	Description
split_channels	option_fixed	0	Split audio channels
scc_capture	option_fixed	true	Capture SCC Closed Captioning
anc_capture	option_fixed	false	Capture ANC Closed Captioning
embed_cc	bool	false	Enable embedding Closed Captions (ATSC) into elementary video stream (only for MPEG-2, MPEG-4, H.264 video)
raw_video	string		Capture RAW video. Set target save path as value.
raw_audio	string		Capture RAW audio. Set target save path as value.
ignore_pts	string		Ignore video sample times. Possible values: true, false

Video codecs

• MPEG-4 part 2 Video
• libx264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
• Cisco OpenH264 Encoder
• Intel QuickSync SW H.264 Encoder
• Intel QuickSync HW H.264 Encoder
• NVIDIA NVEnc H.264 Encoder
• NVIDIA NVEnc H.264 Lossless Encoder
• AMD AMF H.264 Encoder
• Windows Media Video 8
• MPEG-2 Video
• MJPEG (Motion JPEG)
• HuffYUV
• Google VP8
• Google VP9
• DV Video / DVCPRO-HD
• FLV / Sorenson Spark / Sorenson H.263 (Flash Video)
• MPEG-1 Video
• No Video

Audio codecs

• MP2 (MPEG audio layer 2)
• MP3 Lame (MPEG audio layer 3)
• AAC (Advanced Audio Coding)
• ATSC A/52A (AC-3)
• (Uncompressed) PCM 32-bit floating point little-endian
• (Uncompressed) PCM signed 16-bit little-endian
• (Uncompressed) PCM signed 24-bit little-endian
• (Uncompressed) PCM signed 32-bit little-endian
• ADPCM Microsoft
• Ogg Vorbis
• No Audio

iPod MP4 (MPEG-4 Part 14)

Configuration Parameter: ipod

Extensions: m4v,m4a

Additional attributes

Name	Type	Default	Description
split_channels	option_fixed	0	Split audio channels
scc_capture	option_fixed	true	Capture SCC Closed Captioning
anc_capture	option_fixed	false	Capture ANC Closed Captioning
embed_cc	bool	false	Enable embedding Closed Captions (ATSC) into elementary video stream (only for MPEG-2, MPEG-4, H.264 video)
raw_video	string		Capture RAW video. Set target save path as value.
raw_audio	string		Capture RAW audio. Set target save path as value.
ignore_pts	string		Ignore video sample times. Possible values: true, false
movflags	flags		MOV muxer flags frag_keyframe - Fragment at video keyframes faststart - Run a second pass to put the moov at the beginning of the file
moov_size	int	0	Maximum moov size so it can be placed at the begin
skip_iods	int	1	Skip writing iods atom.
iods_audio_profile	int	-1	Iods audio profile atom.
iods_video_profile	int	-1	Iods video profile atom.
frag_duration	int	0	Maximum fragment duration
min_frag_duration	int	0	Minimum fragment duration
frag_size	int	0	Maximum fragment size
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

Video codecs

• MPEG-4 part 2 Video
• libx264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
• Cisco OpenH264 Encoder
• Intel QuickSync SW H.264 Encoder
• Intel QuickSync HW H.264 Encoder
• Intel QuickSync HEVC Encoder
• NVIDIA NVEnc H.264 Encoder
• x265 H.265/HEVC
• No Video

Audio codecs

• AAC (Advanced Audio Coding)
• ATSC A/52A (AC-3)
• ALAC (Apple Lossless Audio Codec)
• No Audio

AVI (Audio Video Interleaved)

Configuration Parameter: avi

Extensions: avi

Additional attributes

Name	Type	Default	Description
split_channels	option_fixed	0	Split audio channels
scc_capture	option_fixed	true	Capture SCC Closed Captioning
anc_capture	option_fixed	false	Capture ANC Closed Captioning
embed_cc	bool	false	Enable embedding Closed Captions (ATSC) into elementary video stream (only for MPEG-2, MPEG-4, H.264 video)
raw_video	string		Capture RAW video. Set target save path as value.
raw_audio	string		Capture RAW audio. Set target save path as value.
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"
ignore_pts	string		Ignore video sample times. Possible values: true, false
reserve_index_space	int	0	reserve space (in bytes) at the beginning of the file for each stream index
write_channel_mask			write channel mask into wave format header

Video codecs

• MPEG-4 part 2 Video
• MPEG-2 Video
• Cisco OpenH264 Encoder
• Intel QuickSync SW H.264 Encoder
• Intel QuickSync HW H.264 Encoder
• Intel QuickSync HEVC Encoder
• NVIDIA NVEnc H.264 Encoder
• NVIDIA NVEnc H.264 Lossless Encoder
• NVIDIA NVEnc H.265 (HEVC) Encoder
• AMD AMF H.264 Encoder
• AMD AMF H.265 (HEVC) Encoder
• x265 H.265/HEVC
• Windows Media Video 8
• MJPEG (Motion JPEG)
• DV Video / DVCPRO-HD
• HuffYUV
• FFV1
• Google VP8
• Google VP9
• FLV / Sorenson Spark / Sorenson H.263 (Flash Video)
• libx264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
• MPEG-1 Video
• OpenJPEG JPEG 2000
• Uncompressed 4:2:2 8bit
• Uncompressed 4:2:2 10bit
• Direct stream copy
• No Video

Audio codecs

• AAC (Advanced Audio Coding)
• ATSC A/52A (AC-3)
• ATSC A/52A (AC-3) Fixed
• MP2 (MPEG audio layer 2)
• (Uncompressed) PCM 32-bit floating point little-endian
• (Uncompressed) PCM signed 16-bit little-endian
• (Uncompressed) PCM signed 24-bit little-endian
• (Uncompressed) PCM signed 32-bit little-endian
• ADPCM Microsoft
• MP3 Lame (MPEG audio layer 3)
• Ogg Vorbis
• Direct stream copy
• No Audio

MKV (Matroska)

Configuration Parameter: matroska

Extensions: mkv

Additional attributes

Name	Type	Default	Description
split_channels	option_fixed	0	Split audio channels
scc_capture	option_fixed	true	Capture SCC Closed Captioning
anc_capture	option_fixed	false	Capture ANC Closed Captioning
embed_cc	bool	false	Enable embedding Closed Captions (ATSC) into elementary video stream (only for MPEG-2, MPEG-4, H.264 video)
raw_video	string		Capture RAW video. Set target save path as value.
raw_audio	string		Capture RAW audio. Set target save path as value.
ignore_pts	string		Ignore video sample times. Possible values: true, false
reserve_index_space	int	0	Reserve a given amount of space (in bytes) at the beginning of the file for the index (cues).
cluster_size_limit	int	-1	Store at most the provided amount of bytes in a cluster.
cluster_time_limit	int64	-1	Store at most the provided number of milliseconds in a cluster.
dash			Create a WebM file conforming to WebM DASH specification
dash_track_number	int	1	Track number for the DASH stream
live			Write files assuming it is a live stream.
allow_raw_vfw			allow RAW VFW mode
write_crc32			write a CRC32 element inside every Level 1 element

Video codecs

• MPEG-4 part 2 Video
• DV Video / DVCPRO-HD
• FLV / Sorenson Spark / Sorenson H.263 (Flash Video)
• Cisco OpenH264 Encoder
• libx264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
• Intel QuickSync SW H.264 Encoder
• Intel QuickSync HW H.264 Encoder
• Intel QuickSync HEVC Encoder
• NVIDIA NVEnc H.264 Encoder
• NVIDIA NVEnc H.264 Lossless Encoder
• NVIDIA NVEnc H.265 (HEVC) Encoder
• AMD AMF H.264 Encoder
• AMD AMF H.265 (HEVC) Encoder
• x265 H.265/HEVC
• Apple ProRes
• HuffYUV
• MJPEG (Motion JPEG)
• MPEG-1 Video
• MPEG-2 Video
• FFV1
• Google VP8
• Google VP9
• Windows Media Video 8
• Direct stream copy
• No Video

Audio codecs

• AAC (Advanced Audio Coding)
• (Uncompressed) PCM signed 16-bit little-endian
• (Uncompressed) PCM signed 24-bit little-endian
• (Uncompressed) PCM signed 32-bit little-endian
• MP2 (MPEG audio layer 2)
• ATSC A/52A (AC-3)
• ATSC A/52A (AC-3) Fixed
• ALAC (Apple Lossless Audio Codec)
• Direct stream copy
• No Audio

WebM

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).
cluster_size_limit	int	-1	Store at most the provided amount of bytes in a cluster.
cluster_time_limit	int64	-1	Store at most the provided number of milliseconds in a cluster.
dash			Create a WebM file conforming to WebM DASH specification
dash_track_number	int	1	Track number for the DASH stream
live			Write files assuming it is a live stream.
allow_raw_vfw			allow RAW VFW mode
write_crc32			write a CRC32 element inside every Level 1 element

Video codecs

• Google VP8
• Google VP9

Audio codecs

• Ogg Vorbis
• No Audio

RTMP Streaming

Configuration Parameter: flv

Extensions: rtmp://

Additional attributes

Name	Type	Default	Description
split_channels	option_fixed	0	Split audio channels
merge_tracks	option_fixed	true	Merge audio tracks
embed_cc	bool	false	Enable embedding Closed Captions (ATSC) into elementary video stream (only for MPEG-2, MPEG-4, H.264 video)
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_live	string		Specify that the media is a live stream. No resuming or seeking in live streams is possible. The default value is any, which means the subscriber first tries to play the live stream specified in the playpath. If a live stream of that name is not found, it plays the recorded stream. The other possible values are live and recorded.
rtmp_pageurl	string		URL of the web page in which the media was embedded. By default no value will be sent.
rtmp_playpath	string		Stream identifier to play or to publish. This option overrides the parameter specified in the URI.
rtmp_subscribe	string		Name of live stream to subscribe to. By default no value will be sent. It is only sent if the option is specified or if rtmp_live is set to live.

Video codecs

• FLV / Sorenson Spark / Sorenson H.263 (Flash Video)
• Cisco OpenH264 Encoder
• H.264 / MPEG-4 AVC
• Intel QuickSync SW H.264 Encoder
• Intel QuickSync HW H.264 Encoder
• NVIDIA NVEnc H.264 Encoder
• AMD AMF H.264 Encoder
• Direct stream copy
• No Video

Audio codecs

• MP3 Lame (MPEG audio layer 3)
• PCM signed 16-bit little-endian
• AAC (Advanced Audio Coding)
• Direct stream copy
• No Audio

UDP Streaming

Configuration Parameter: mpegts

Extensions: udp://

Additional attributes

Name	Type	Default	Description
split_channels	option_fixed	0	Split audio channels
embed_cc	bool	false	Enable embedding Closed Captions (ATSC) into elementary video stream (only for MPEG-2, MPEG-4, H.264 video)
embed_scte35	bool	false	Enable embedding SCTE-35 triggers into MPEG transport stream
mpegts_transport_stream_id	int	1	Set transport_stream_id field.
mpegts_original_network_id	int	65281	Set original_network_id field.
mpegts_service_id	int	1	Set service_id field.
mpegts_service_type	option	digital_tv	Set service_type field. 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.
mpegts_pmt_start_pid	int	4096	Set the first pid of the PMT.
mpegts_start_pid	int	256	Set the first pid.
mpegts_m2ts_mode			Enable m2ts mode.
muxrate	int	1
pes_payload_size	int	2930	Minimum PES packet payload in bytes
mpegts_flags	flags		MPEG-TS muxing flags resend_headers - Reemit PAT/PMT before writing the next packet latm - Use LATM packetization for AAC pat_pmt_at_frames - Reemit PAT and PMT at each video frame system_b - Conform to System B (DVB) instead of System A (ATSC) initial_discontinuity - Mark initial packets as discontinuous
resend_headers	int	0	Reemit PAT/PMT before writing the next packet
mpegts_copyts			don't offset dts/pts
tables_version	int	0	set PAT, PMT and SDT version
omit_video_pes_length			Omit the PES packet length for video packets
pcr_period	int	20	PCR retransmission time
pat_period	double	2147483647.000000	PAT/PMT retransmission time limit in seconds
sdt_period	double	2147483647.000000	SDT retransmission time limit in seconds
flush_packets	int	-1	Enable flushing of the I/O context after each packet

Video codecs

• MPEG-2 Video
• MPEG-4 part 2 Video
• H.264 / MPEG-4 AVC
• Cisco OpenH264 Encoder
• Intel QuickSync SW H.264 Encoder
• Intel QuickSync HW H.264 Encoder
• Intel QuickSync HEVC Encoder
• NVIDIA NVEnc H.264 Encoder
• NVIDIA NVEnc H.264 Lossless Encoder
• NVIDIA NVEnc H.265 (HEVC) Encoder
• AMD AMF H.264 Encoder
• AMD AMF H.265 (HEVC) Encoder
• x265 H.265/HEVC
• MJPEG (Motion JPEG)
• Direct stream copy
• No Video

Audio codecs

• MP3 Lame (MPEG audio layer 3)
• AAC (Advanced Audio Coding)
• MP2 (MPEG audio layer 2)
• ATSC A/52A (AC-3)
• ATSC A/52A (AC-3) Fixed
• Direct stream copy
• No Audio

DVB Compatible Streaming

Configuration Parameter: dvb

Extensions: udp://

Additional attributes

Name	Type	Default	Description
split_channels	option_fixed	0	Split audio channels
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	MPService001	Set Service Name
service_provider	string	Medialooks MPlatform 1.7	Set Service Provider
transport_stream_id	int	1	Set transport_stream_id field.
original_network_id	int	1	Set original_network_id field.
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.
service_id	int	1	Set service_id field.
service_type	option_fixed	digital_tv	Service type
pmt_start_pid	int	129	Set the first pid of the PMT
start_pid	int	1024	Set the first pid.
pes_payload_size	int	2930	Minimum PES packet payload in bytes
mpegts_flags	flags	+system_b	MPEG-TS muxing flags 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)
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"
resend_headers	int	0	Reemit PAT/PMT before writing the next packet
tables_version	int	0	set PAT, PMT and SDT version
rc_buffers	int	8	Rate-Control buffers
rc_sync_msec	int	1	Rate-Control precision (in msec, miminum 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 default PCR retransmission time in milliseconds (default 20ms)
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)
nit_period	double	9.0	NIT retransmission time limit in seconds (default 3 s)
tdt_period	double	25.0	TDT retransmission time limit in seconds (default 10 s)
eit_period	double	1.5	EIT present/following retransmission time limit in seconds (default 0.5 s)
flush_packets	int	-1	Enable flushing of the I/O context after each packet
max_delay	int	700000	Set maximum multiplexing PTS/PCR delay in microseconds

Video codecs

• MPEG-2 Video
• MPEG-4 part 2 Video
• H.264 / MPEG-4 AVC
• Cisco OpenH264 Encoder
• Intel QuickSync SW H.264 Encoder
• Intel QuickSync HW H.264 Encoder
• Intel QuickSync HEVC Encoder
• NVIDIA NVEnc H.264 Encoder
• NVIDIA NVEnc H.264 Lossless Encoder
• NVIDIA NVEnc H.265 (HEVC) Encoder
• AMD AMF H.264 Encoder
• AMD AMF H.265 (HEVC) Encoder
• x265 H.265/HEVC
• Direct stream copy
• No Video

Audio codecs

• AAC (Advanced Audio Coding)
• MP2 (MPEG audio layer 2)
• MP3 Lame (MPEG audio layer 3)
• ATSC A/52A (AC-3)
• ATSC A/52A (AC-3) Fixed
• Direct stream copy
• No Audio

SRT - Secure Reliable Tranport

Configuration Parameter: mpegts

Extensions: srt://

Additional attributes

Name	Type	Default	Description
maxbw	int	-1	Maximum send bandwidth. -1: infinite (CSRTCC limit is 30mbps) = 0: relative to input rate.
pbkeylen	option_fixed	0	Sender encryption key length.
passphrase	string		Sets the passphrase for encryption. 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	Flight Flag Size (maximum number of bytes that can be sent without being acknowledged).
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	option_fixed	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.
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
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.
oheadbw	int	25	Recovery bandwidth overhead above input rate (see SRTO_INPUTBW). Sender: user configurable, default: 25%.
latency	int	0	This flag sets both SRTO_RCVLATENCY and SRTO_PEERLATENCY to the same value. Note that prior to version 1.3.0 this is the only flag to set the latency, however this is effectively equivalent to setting SRTO_PEERLATENCY, when the side is sender (see SRTO_SENDER) and SRTO_RCVLATENCY when the side is receiver, and the bidirectional stream sending in version 1.2.0is not supported.
tsbpddelay
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
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	Connect timeout. SRT cannot connect for RTT > 1500 msec (2 handshake exchanges) with the default connect timeout of 3 seconds. This option applies to the caller and rendezvous connection modes. The connect timeout is 10 times the value set for the rendezvous mode (which can be used as a workaround for this connection problem with earlier versions)
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.
peerlatency	int	0	The latency value (as described in SRTO_RCVLATENCY) that is set by the sender side as a minimum value for the receiver.
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	option_fixed	live	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			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
kmrefreshrate
kmpreannounce
split_channels	option_fixed	0	Split audio channels
embed_cc	bool	false	Enable embedding Closed Captions (ATSC) into elementary video stream (only for MPEG-2, MPEG-4, H.264 video)
embed_scte35	bool	false	Enable embedding SCTE-35 triggers into MPEG transport stream
mpegts_transport_stream_id	int	1	Set transport_stream_id field.
mpegts_original_network_id	int	65281	Set original_network_id field.
mpegts_service_id	int	1	Set service_id field.
mpegts_service_type	option	digital_tv	Set service_type field. 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.
mpegts_pmt_start_pid	int	4096	Set the first pid of the PMT.
mpegts_start_pid	int	256	Set the first pid.
mpegts_m2ts_mode			Enable m2ts mode.
muxrate	int	1
pes_payload_size	int	2930	Minimum PES packet payload in bytes
mpegts_flags	flags		MPEG-TS muxing flags resend_headers - Reemit PAT/PMT before writing the next packet latm - Use LATM packetization for AAC pat_pmt_at_frames - Reemit PAT and PMT at each video frame system_b - Conform to System B (DVB) instead of System A (ATSC) initial_discontinuity - Mark initial packets as discontinuous
resend_headers	int	0	Reemit PAT/PMT before writing the next packet
mpegts_copyts			don't offset dts/pts
tables_version	int	0	set PAT, PMT and SDT version
omit_video_pes_length			Omit the PES packet length for video packets
pcr_period	int	20	PCR retransmission time
pat_period	double	2147483647.000000	PAT/PMT retransmission time limit in seconds
sdt_period	double	2147483647.000000	SDT retransmission time limit in seconds

Video codecs

• MPEG-2 Video
• MPEG-4 part 2 Video
• H.264 / MPEG-4 AVC
• Cisco OpenH264 Encoder
• Intel QuickSync SW H.264 Encoder
• Intel QuickSync HW H.264 Encoder
• Intel QuickSync HEVC Encoder
• NVIDIA NVEnc H.264 Encoder
• NVIDIA NVEnc H.264 Lossless Encoder
• NVIDIA NVEnc H.265 (HEVC) Encoder
• AMD AMF H.264 Encoder
• AMD AMF H.265 (HEVC) Encoder
• x265 H.265/HEVC
• Direct stream copy
• No Video

Audio codecs

• MP3 Lame (MPEG audio layer 3)
• AAC (Advanced Audio Coding)
• MP2 (MPEG audio layer 2)
• ATSC A/52A (AC-3)
• ATSC A/52A (AC-3) Fixed
• Direct stream copy
• No Audio

SRT - Secure Reliable Tranport (DVB Compatible)

Configuration Parameter: dvb

Extensions: srt://

Additional attributes

Name	Type	Default	Description
maxbw	int	-1	Maximum send bandwidth. -1: infinite (CSRTCC limit is 30mbps) = 0: relative to input rate.
pbkeylen	option_fixed	0	Sender encryption key length.
passphrase	string		Sets the passphrase for encryption. 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	Flight Flag Size (maximum number of bytes that can be sent without being acknowledged).
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	option_fixed	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.
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
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.
oheadbw	int	25	Recovery bandwidth overhead above input rate (see SRTO_INPUTBW). Sender: user configurable, default: 25%.
latency	int	0	This flag sets both SRTO_RCVLATENCY and SRTO_PEERLATENCY to the same value. Note that prior to version 1.3.0 this is the only flag to set the latency, however this is effectively equivalent to setting SRTO_PEERLATENCY, when the side is sender (see SRTO_SENDER) and SRTO_RCVLATENCY when the side is receiver, and the bidirectional stream sending in version 1.2.0is not supported.
tsbpddelay
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
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	Connect timeout. SRT cannot connect for RTT > 1500 msec (2 handshake exchanges) with the default connect timeout of 3 seconds. This option applies to the caller and rendezvous connection modes. The connect timeout is 10 times the value set for the rendezvous mode (which can be used as a workaround for this connection problem with earlier versions)
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.
peerlatency	int	0	The latency value (as described in SRTO_RCVLATENCY) that is set by the sender side as a minimum value for the receiver.
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	option_fixed	live	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			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
kmrefreshrate
kmpreannounce
split_channels	option_fixed	0	Split audio channels
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	MPService001	Set Service Name
service_provider	string	Medialooks MPlatform 1.7	Set Service Provider
transport_stream_id	int	1	Set transport_stream_id field.
original_network_id	int	1	Set original_network_id field.
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.
service_id	int	1	Set service_id field.
service_type	option_fixed	digital_tv	Service type
pmt_start_pid	int	129	Set the first pid of the PMT
start_pid	int	1024	Set the first pid.
pes_payload_size	int	2930	Minimum PES packet payload in bytes
mpegts_flags	flags	+system_b	MPEG-TS muxing flags 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)
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"
resend_headers	int	0	Reemit PAT/PMT before writing the next packet
tables_version	int	0	set PAT, PMT and SDT version
rc_buffers	int	8	Rate-Control buffers
rc_sync_msec	int	1	Rate-Control precision (in msec, miminum 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 default PCR retransmission time in milliseconds (default 20ms)
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)

Video codecs

• MPEG-2 Video
• MPEG-4 part 2 Video
• H.264 / MPEG-4 AVC
• Cisco OpenH264 Encoder
• Intel QuickSync SW H.264 Encoder
• Intel QuickSync HW H.264 Encoder
• Intel QuickSync HEVC Encoder
• NVIDIA NVEnc H.264 Encoder
• NVIDIA NVEnc H.264 Lossless Encoder
• NVIDIA NVEnc H.265 (HEVC) Encoder
• AMD AMF H.264 Encoder
• AMD AMF H.265 (HEVC) Encoder
• x265 H.265/HEVC
• Direct stream copy
• No Video

Audio codecs

• AAC (Advanced Audio Coding)
• MP2 (MPEG audio layer 2)
• MP3 Lame (MPEG audio layer 3)
• ATSC A/52A (AC-3)
• ATSC A/52A (AC-3) Fixed
• Direct stream copy
• No Audio

RTP

Configuration Parameter: rtp

Extensions:

Additional attributes

Name	Type	Default	Description
sdp	string	C:\Config.sdp	Path to .sdp file.
rtpflags	flags		RTP muxer flags 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
payload_type	int	-1	Specify RTP payload type
ssrc	int	0	Stream identifier
cname	string		CNAME to include in RTCP SR packets
seq	int	-1	Starting sequence number

Video codecs

• MPEG-2 Video
• MPEG-4 part 2 Video
• libx264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
• Cisco OpenH264 Encoder
• Intel QuickSync SW H.264 Encoder
• Intel QuickSync HW H.264 Encoder
• Intel QuickSync HEVC Encoder
• NVIDIA NVEnc H.264 Encoder
• NVIDIA NVEnc H.264 Lossless Encoder
• NVIDIA NVEnc H.265 (HEVC) Encoder
• AMD AMF H.264 Encoder
• AMD AMF H.265 (HEVC) Encoder
• x265 H.265/HEVC
• No Video

Audio codecs

• MP2 (MPEG audio layer 2)
• No Audio

RTP (Pro-MPEG)

Configuration Parameter: rtp_mpegts

Extensions:

Video codecs

• MPEG-2 Video
• MPEG-4 part 2 Video
• libx264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
• Cisco OpenH264 Encoder
• Intel QuickSync SW H.264 Encoder
• Intel QuickSync HW H.264 Encoder
• Intel QuickSync HEVC Encoder
• NVIDIA NVEnc H.264 Encoder
• NVIDIA NVEnc H.264 Lossless Encoder
• NVIDIA NVEnc H.265 (HEVC) Encoder
• AMD AMF H.264 Encoder
• AMD AMF H.265 (HEVC) Encoder
• x265 H.265/HEVC
• No Video

Audio codecs

• MP2 (MPEG audio layer 2)
• AAC (Advanced Audio Coding)
• MP3 Lame (MPEG audio layer 3)
• ATSC A/52A (AC-3)
• ATSC A/52A (AC-3) Fixed
• No Audio

Additional attributes

Name	Type	Default	Description
l	int	8	The number of columns (4-20, LxD Lsss 100)
d	int	4	The number of rows (4-20, LxD Less 100)

RTSP Streaming (beta)

Configuration Parameter: rtsp

Extensions: rtsp://

Additional attributes

Name	Type	Default	Description
split_channels	option_fixed	0	Split audio channels
embed_cc	bool	false	Enable embedding Closed Captions (ATSC) into elementary video stream (only for MPEG-2, MPEG-4, H.264 video)
rtpflags	flags		RTP muxer flags 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
rtsp_transport	flags		set RTSP transport protocols udp - UDP tcp - TCP
rtsp_flags			try RTP via TCP first, if available
min_port	int	5000	set minimum local UDP port
max_port	int	65000	set maximum local UDP port
buffer_size	int	-1	Underlying protocol send/receive buffer size

Video codecs

• Cisco OpenH264 Encoder
• H.264 / MPEG-4 AVC
• Intel QuickSync SW H.264 Encoder
• Intel QuickSync HW H.264 Encoder
• Intel QuickSync HEVC Encoder
• NVIDIA NVEnc H.264 Encoder
• NVIDIA NVEnc H.265 (HEVC) Encoder
• AMD AMF H.264 Encoder
• AMD AMF H.265 (HEVC) Encoder
• x265 H.265/HEVC
• MPEG-2 Video
• MPEG-4 part 2 Video
• Direct stream copy
• No Video

Audio codecs

• AAC (Advanced Audio Coding)
• No Audio

IIS Live Smooth Streaming

Configuration Parameter: ismv

Extensions: http://

Video codecs

• Cisco OpenH264 Encoder
• Intel QuickSync SW H.264 Encoder
• Intel QuickSync HW H.264 Encoder
• Intel QuickSync HEVC Encoder
• NVIDIA NVEnc H.264 Encoder
• NVIDIA NVEnc H.265 (HEVC) Encoder
• AMD AMF H.264 Encoder
• AMD AMF H.265 (HEVC) Encoder
• x265 H.265/HEVC
• VC-1
• Direct stream copy
• No Video

Audio codecs

• AAC (Advanced Audio Coding)
• Direct stream copy

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 (only for MPEG-2, MPEG-4, H.264 video)
embed_scte35	bool	false	Enable embedding SCTE-35 triggers into HLS stream
start_number	int64	0	set first number in the sequence
hls_time	double	2.000000	set segment length in seconds
hls_init_time	double	0.000000	set segment length in seconds at init list
hls_list_size	int	5	set maximum number of playlist entries
hls_delete_threshold	int	1	set number of unreferenced segments to keep before deleting
hls_ts_options	string		set hls mpegts list of options for the container format used for hls
hls_vtt_options	string		set hls vtt list of options for the container format used for hls
hls_wrap	int	0	set number after which the index wraps (will be deprecated)
hls_allow_cache	int	-1	explicitly set whether the client MAY (1) or MUST NOT (0) cache media segments
hls_base_url	string		url to prepend to each playlist entry
hls_segment_filename	string		filename template for segment files
hls_segment_size	int	0	maximum size per segment file, (in bytes)
hls_key_info_file	string		file with key URI and key file path
hls_enc			enable AES128 encryption support
hls_enc_key	string		hex-coded 16 byte key to encrypt the segments
hls_enc_key_url	string		url to access the key to decrypt the segments
hls_enc_iv	string		hex-coded 16 byte initialization vector
hls_subtitle_path	string		set path of hls subtitles
hls_segment_type	option	mpegts	set hls segment files type
segment_type			fmp4 - make segment file to fragment mp4 files in m3u8
hls_fmp4_init_filename	string	init.mp4	set fragment mp4 file init filename
hls_flags	flags		set flags affecting HLS playlist and media file generation
flags			temp_file - write segment to temporary file and rename when complete delete_segments - delete segment files that are no longer part of the playlist round_durations - round durations in m3u8 to whole numbers discont_start - start the playlist with a discontinuity tag omit_endlist - Do not append an endlist when ending stream split_by_time - split the hls segment by time which user set by hls_time append_list - append the new segments into old hls segment list program_date_time - add EXT-X-PROGRAM-DATE-TIME second_level_segment_index - include segment index in segment filenames when use_localtime second_level_segment_duration - include segment duration in segment filenames when use_localtime second_level_segment_size - include segment size in segment filenames when use_localtime periodic_rekey - reload keyinfo file periodically for re-keying independent_segments - add EXT-X-INDEPENDENT-SEGMENTS, whenever applicable
use_localtime			set filename expansion with strftime at segment creation
use_localtime_mkdir			create last directory component in strftime-generated filename
hls_playlist_type	option		set the HLS playlist type
pl_type			vod - VOD playlist
method	string		set the HTTP method(default: PUT)
hls_start_number_source	option	generic	set source of first number in sequence
start_sequence_source_type			epoch - seconds since epoch datetime - current datetime as YYYYMMDDhhmmss
http_user_agent	string		override User-Agent field in HTTP header
var_stream_map	string		Variant stream map string
cc_stream_map	string		Closed captions stream map string
master_pl_name	string		Create HLS master playlist with this name
master_pl_publish_rate	int	0	Publish master play list every after this many segment intervals
http_persistent			Use persistent HTTP connections
timeout			set timeout for socket I/O operations

Video codecs

• MPEG-2 Video
• MPEG-4 part 2 Video
• libx264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
• Cisco OpenH264 Encoder
• Intel QuickSync SW H.264 Encoder
• Intel QuickSync HW H.264 Encoder
• Intel QuickSync HEVC Encoder
• NVIDIA NVEnc H.264 Encoder
• NVIDIA NVEnc H.264 Lossless Encoder
• NVIDIA NVEnc H.265 (HEVC) Encoder
• AMD AMF H.264 Encoder
• AMD AMF H.265 (HEVC) Encoder
• x265 H.265/HEVC
• Direct stream copy
• No Video

Audio codecs

• MP2 (MPEG audio layer 2)
• AAC (Advanced Audio Coding)
• MP3 Lame (MPEG audio layer 3)
• ATSC A/52A (AC-3)
• ATSC A/52A (AC-3) Fixed
• Direct stream copy
• No Audio

Image Sequence

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 Codec
• PNG Codec
• JPG Codec

Audio codecs

• No Audio
• WAV (Wave Audio File)

MP3 (MPEG audio layer 3)

Configuration Parameter: mp3

Extensions: mp3

Additional attributes

Name	Type	Default	Description
id3v2_version	int	4	Select ID3v2 version to write. Currently 3 and 4 are supported.
write_id3v1	int	0	Enable ID3v1 writing. ID3v1 tags are written in UTF-8 which may not be supported by most software.

Video codecs

• No Video

Audio codecs

• MP3 Lame (MPEG audio layer 3)

AC3 (AC3 audio files)

Configuration Parameter: ac3

Extensions: ac3

Video codecs

• No Video

Audio codecs

• ATSC A/52A (AC-3)
• ATSC A/52A (AC-3) Fixed

AAC (Advanced Audio Codec)

Configuration Parameter: adts

Extensions: aac

Video codecs

• No Video

Audio codecs

• AAC (Advanced Audio Coding)

WAV (Wave Audio Files)

Configuration Parameter: wav

Extensions: wav

Video codecs

• No Video

Audio codecs

• (Uncompressed) PCM signed 16-bit little-endian
• (Uncompressed) PCM 32-bit floating point little-endian
• (Uncompressed) PCM D-Cinema audio signed 24-bit
• (Uncompressed) PCM signed 24-bit little-endian
• (Uncompressed) PCM signed 32-bit little-endian

Ogg

Configuration Parameter: ogg

Extensions: ogg

Video codecs

• No Video

Audio codecs

• Vorbis

Audio Codecs

General Audio Attributes

used when no other attributes are specified

Name	Type	Default	Description
b	int	128K	Set bitrate (in bits/s)
ar	int	0	Set audio sampling rate (in Hz)
flags	flags		bitexact - use only bitexact stuff (except (i)dct)
maxrate	int	0	Set max bitrate tolerance (in bits/s). Requires bufsize to be set.
minrate	int	0	Set min bitrate tolerance (in bits/s). Most useful in setting up a CBR encode. It is of little use elsewise.
bufsize	int	0	Set ratecontrol buffer size (in bits)

AAC (Advanced Audio Coding)

Configuration Parameter: aac

Additional attributes

Name	Type	Default	Description
stereo_mode	option_fixed	ms_off	Stereo coding method auto - Selected by the Encoder ms_off - Disable Mid/Side coding ms_force - Force Mid/Side for the whole frame if possible
aac_coder	int	2	AAC coder
profile	option_fixed	unknown	Profile of AAC coding. Possible values: unknown, main, low, ssr, ltp, he, he_v2, ld, eld.

ATSC A/52A (AC-3)

Configuration Parameter: ac3

Additional attributes

Name	Type	Default	Description
profile	option_fixed	unknown	AC3 profile. Possible values: unknown, dts, dts_es, dts_96_24, dts_hd_hra, dts_hd_ma.
center_mixlev	double	0.594604	Center Mix Level
surround_mixlev	double	0.500000	Surround Mix Level
mixing_level	int	-1	Mixing Level
copyright	int	-1	Copyright Bit
dsur_mode	option_fixed		Dolby Surround Mode notindicated - Not Indicated (default) on - Dolby Surround Encoded off - Not Dolby Surround Encoded
ltrt_cmixlev	double	-1.000000	Lt/Rt Center Mix Level
ltrt_surmixlev	double	-1.000000	Lt/Rt Surround Mix Level
loro_cmixlev	double	-1.000000	Lo/Ro Center Mix Level
loro_surmixlev	double	-1.000000	Lo/Ro Surround Mix Level

ATSC A/52A (AC-3) Fixed

Configuration Parameter: ac3_fixed

Additional attributes

Name	Type	Default	Description
profile	option_fixed	unknown	AC3 profile. Possible values: unknown, dts, dts_es, dts_96_24, dts_hd_hra, dts_hd_ma.
center_mixlev	double	0.594604	Center Mix Level
surround_mixlev	double	0.500000	Surround Mix Level
mixing_level	int	-1	Mixing Level
copyright	int	-1	Copyright Bit
dsur_mode	option_fixed		Dolby Surround Mode notindicated - Not Indicated (default) on - Dolby Surround Encoded off - Not Dolby Surround Encoded
ltrt_cmixlev	double	-1.000000	Lt/Rt Center Mix Level
ltrt_surmixlev	double	-1.000000	Lt/Rt Surround Mix Level
loro_cmixlev	double	-1.000000	Lo/Ro Center Mix Level
loro_surmixlev	double	-1.000000	Lo/Ro Surround Mix Level

ALAC (Apple Lossless Audio Codec)

Configuration Parameter: alac

ATSC A/52 E-AC-3

Configuration Parameter: eac3

Additional attributes

Name	Type	Default	Description
profile	option_fixed	unknown	Profile name. Possible values: unknown, dts, dts_es, dts_96_24, dts_hd_hra, dts_hd_ma.
mixing_level	int	-1	Mixing Level
copyright	int	-1	Copyright Bit
dsur_mode	option_fixed		Dolby Surround Mode notindicated - Not Indicated (default) on - Dolby Surround Encoded off - Not Dolby Surround Encoded
ltrt_cmixlev	double	-1.000000	Lt/Rt Center Mix Level
ltrt_surmixlev	double	-1.000000	Lt/Rt Surround Mix Level
loro_cmixlev	double	-1.000000	Lo/Ro Center Mix Level
loro_surmixlev	double	-1.000000	Lo/Ro Surround Mix Level

FLAC (Free Lossless Audio Codec)

Configuration Parameter: flac

Additional attributes

Name	Type	Default	Description
lpc_coeff_precision	int	15	LPC coefficient precision
lpc_type	option_fixed		LPC algorithm. Possible values: none, fixed, levinson, cholesky.
lpc_passes	int	-1	Number of passes to use for Cholesky factorization during LPC analysis
min_partition_order	int	-1	Minimal partition order
max_partition_order	int	-1	Maximal partition order
prediction_order_method	option_fixed		Search method for selecting prediction order
predm			Search method for selecting prediction order. Possible values: estimation, 2level, 4level, 8level, search, log.
ch_mode	option_fixed	auto	Stereo decorrelation mode. Possible values: auto, indep, left_side, right_side, mid_side.

MP2 (MPEG audio layer 2)

Configuration Parameter: mp2

Ogg Vorbis

Configuration Parameter: libvorbis

(Uncompressed) PCM 32-bit floating point little-endian

Configuration Parameter: pcm_f32le

(Uncompressed) PCM signed 16-bit little-endian

Configuration Parameter: pcm_s16le

(Uncompressed) PCM D-Cinema audio signed 24-bit

Configuration Parameter: pcm_s24daud

(Uncompressed) PCM signed 24-bit little-endian

Configuration Parameter: pcm_s24le

(Uncompressed) PCM signed 32-bit little-endian

Configuration Parameter: pcm_s32le

ADPCM IMA QuickTime

Configuration Parameter: adpcm_ima_qt

ADPCM Microsoft

Configuration Parameter: adpcm_ms

MP3 Lame (MPEG audio layer 3)

Configuration Parameter: libmp3lame

Video Codecs

General Video Attributes

used when no other attributes are specified

Name	Type	Default	Description
b	int	5M	Set bitrate (in bits/s)
bt	int	4000000	Set video bitrate tolerance (in bits/s). In 1-pass mode, bitrate tolerance specifies how far ratecontrol is willing to deviate from the target average bitrate value. This is not related to min/max bitrate. Lowering tolerance too much has an adverse effect on quality.
flags	flags		ildct - use interlaced dct low_delay - force low delay ilme - interlaced motion estimation cgop - closed GOP
size	string		Resolution of video. Format: WIDTHxHEIGHT.
ar	option		Aspect ratio of video.
ar_type	option_fixed		Type of video's aspect ratio.
g	int	-1	Keyframe interval, also known as GOP length. This determines the maximum distance between I-frames. Very high GOP lengths will result in slightly more efficient compression, but will make seeking in the video somewhat more difficult.
qcomp	double	0.500000	Video quantizer scale compression (VBR). Constant of ratecontrol equation. Recommended range for default rc_eq: 0.0-1.0
qmin	int	-1	Min video quantizer scale (VBR)
qmax	int	-1	Max video quantizer scale (VBR)
qdiff	int	3	Max difference between the quantizer scale (VBR)
bf	int	0	This parameter simply serves to limit the max number of B-frames. Note that Baseline Profile, such as that used by iPods, does not support B-frames. Recommended default: 16
b_strategy	int	0	Strategy to choose between I/P/B-frames. 0: Very fast; 1: Fast, a good balance between speed and quality; 2: A much slower but more accurate B-frame decision mode that correctly detects fades and generally gives considerably better quality.
maxrate	int	0	Specifies the maximum bitrate at any point in the video. Requires the VBV buffersize to be set. This option is generally used when encoding for a piece of hardware with bitrate limitations.
minrate	int	0	Set min bitrate tolerance (in bits/s). Most useful in setting up a CBR encode. It is of little use elsewise.
bufsize	int	0	Set ratecontrol buffer size (in bits). Depends on the profile level of the video being encoded. Set only if you're encoding for a hardware device.
i_qfactor	double	-0.800000	Qscale difference between I-frames and P-frames.
dct	option_fixed	auto	DCT algorithm auto - autoselect a good one (default) fastint - fast integer int - accurate integer mmx - MMX altivec - altivec faan - floating point AAN DCT
aspect	double	0/1	Sample aspect ratio
cmp	option_fixed	sad	Full pel motion estimation compare function
cmp_func			sse - sum of squared errors satd - sum of absolute Hadamard transformed differences dct - sum of absolute DCT transformed differences bit - number of bits needed for the block rd - rate distortion optimal, slow zero - 0 vsad - sum of absolute vertical differences vsse - sum of squared vertical differences nsse - noise preserving sum of squared differences w53 - 5/3 wavelet, only used in snow w97 - 9/7 wavelet, only used in snow dctmax - DCT max chroma - Chroma
subq	int	8	Sub pel motion estimation quality
me_range	int	0	MErange controls the max range of the motion search.
coder	option_fixed	vlc	ac - arithmetic coder raw - raw (no encoding) rle - run-length coder deflate - deflate-based coder
sc_threshold	int	0	Adjusts the sensitivity of codec's scenecut detection.
lmin	int	236	Min lagrange factor (VBR)
lmax	int	3658	Max lagrange factor (VBR)
rc_init_occupancy	int	0	Number of bits which should be loaded into the rc buffer before decoding starts
threads	option_fixed		detect a good number of threads
dc	int	0	Intra DC Precision indicates the number of bits for quantized DC coefficients of intra-coded blocks; it takes one of the values of 8, 9, 10, or 11 bits. The more bits are used, the more precise quantization is achieved.
profile	option_fixed	unknown	Profile of attributes
tag	string		Codec's tag (for example, 'xvid')
scaling_quality	string	auto	scaling quality for video encoding
refs	int	1	Reference frames to consider for motion compensation
trellis	int	0	0: disabled; 1: enabled only on the final encode of a MB; 2: enabled on all mode decisions. The main decision made in quantization is which coefficients to round up and which to round down. Trellis chooses the optimal rounding choices for the maximum rate-distortion score, to maximize PSNR relative to bitrate.
timecode_frame_start	int64	-1	GOP timecode frame start number, in non drop frame format
rc_max_vbv_use	double	0.000000	Maximal rate control of video buffer verifier's usage
rc_min_vbv_use	double	3.000000	Minimal rate control of video buffer verifier's usage
slices	int	0	Number of slices, used in parallelized encoding
top	int		Field order for interlaced files (-1 - auto, 0 - bottom first, 1 - top first)
thread_type	flags	+slice+frame	Select multithreading type slice - Slice frame - Frame

Uncompressed 4:2:2 8bit

Configuration Parameter: rawvideo

Uncompressed 4:2:2 10bit

Configuration Parameter: v210

DV Video / DVCPRO-HD

Configuration Parameter: dvvideo

Additional attributes

Name	Type	Default	Description
dv_format	option_fixed	auto	Format for DV codec. Possible values: dvsd, dv25, dv50, dvhd.

Intel QuickSync H.264 Encoder

Configuration Parameter: q264

Additional attributes

Name	Type	Default	Description
b	int	5M	The average bit rate in bps is the target bit rate used for VBR rate control
quality	string		Quality of captured video. Possible values: from 1 (fast capturing, minimal quality) to 7 (maximal quality, slow capturing)
g	int	15	This is the IDR period for H264
profile	option_fixed	Auto	Set the profile
level	option_fixed	Auto	Sets the level flag in the output bitstream
rc_type	option_fixed	quality	The rate control type
maxrate	int	0	The maximum bit rate in bps is the peak bit rate used for VBR rate control
bufsize	int	0	Set ratecontrol buffer size (in bits). Depends on the profile level of the video being encoded. Set only if you're encoding for a hardware device.
initialdelay	int	0	Specifies the initial delay in bits. Set 0 to use the default initial delay
bf	int	1	This sets the distance of one P picture from the previous P picture. e.g. for IBBPBBP, set the value as 3
ref_frames	int	0	Number of reference frames; if NumRefFrame = 0, this parameter is not specified.
cavlc	option_fixed	false	Enable/disable Context-adaptive variable-length coding mode.
size	string		Resolution of video. Format: WIDTHxHEIGHT.
icq_quality	int	25	Quality of intelligent constant quality algorithm. Possible values: from 1 (the best quality) to 51.
accuracy	int	100	Determines quality of complex scenes in AVBR mode.
convergence	int	0	Determines quality of complex scenes in AVBR mode.
qpi	int	22	Determines quality in CQP mode.
qpb	int	22	Determines quality in CQP mode.
qpp	int	22	Determines quality in CQP mode.
force_gpu	int	-2	Force Specified GPU encoder (0 - HW mode (first suitable HW device), -1 - SW mode, -2 - Auto HW/SW mode, 1..4 - Use specified HW device)
use_vpp	bool	false	Use Intel VPP for frame conversion and scaling

Intel QuickSync SW H.264 Encoder

Configuration Parameter: q264sw

Additional attributes

Name	Type	Default	Description
b	int	5M	The average bit rate in bps is the target bit rate used for VBR rate control
quality	string		Quality of captured video. Possible values: from 1 (fast capturing, minimal quality) to 7 (maximal quality, slow capturing)
g	int	15	This is the IDR period for H264
profile	option_fixed	Auto	Set the profile
level	option_fixed	Auto	Sets the level flag in the output bitstream
rc_type	option_fixed	quality	The rate control type
maxrate	int	0	The maximum bit rate in bps is the peak bit rate used for VBR rate control
bufsize	int	0	Set ratecontrol buffer size (in bits). Depends on the profile level of the video being encoded. Set only if you're encoding for a hardware device.
initialdelay	int	0	Specifies the initial delay in bits. Set 0 to use the default initial delay
bf	int	1	This sets the distance of one P picture from the previous P picture. e.g. for IBBPBBP, set the value as 3
ref_frames	int	0	Number of reference frames; if NumRefFrame = 0, this parameter is not specified.
cavlc	option_fixed	false	Enable/disable Context-adaptive variable-length coding mode.
size	string		Resolution of video. Format: WIDTHxHEIGHT.
icq_quality	int	25	Quality of intelligent constant quality algorithm. Possible values: from 1 (the best quality) to 51.
accuracy	int	100	Determines quality of complex scenes in AVBR mode.
convergence	int	0	Determines quality of complex scenes in AVBR mode.
qpi	int	22	Determines quality in CQP mode.
qpb	int	22	Determines quality in CQP mode.
qpp	int	22	Determines quality in CQP mode.
use_vpp	bool	false	Use Intel VPP for frame conversion and scaling

Intel QuickSync HW H.264 Encoder

Configuration Parameter: q264hw

Additional attributes

Name	Type	Default	Description
b	int	5M	The average bit rate in bps is the target bit rate used for VBR rate control
gpu_memory	bool	false	Frames are stored in GPU memory
quality	string	7	Quality of captured video. Possible values: from 1 (fast capturing, minimal quality) to 7 (maximal quality, slow capturing)
g	int	15	This is the IDR period for H264
profile	option_fixed	Auto	Set the profile
level	option_fixed	Auto	Sets the level flag in the output bitstream
rc_type	option_fixed	quality	The rate control type
maxrate	int	0	The maximum bit rate in bps is the peak bit rate used for VBR rate control
bufsize	int	0	Set ratecontrol buffer size (in bits). Depends on the profile level of the video being encoded. Set only if you're encoding for a hardware device.
initialdelay	int	0	Specifies the initial delay in bits. Set 0 to use the default initial delay
bf	int	1	This sets the distance of one P picture from the previous P picture. e.g. for IBBPBBP, set the value as 3
ref_frames	int	0	Number of reference frames; if NumRefFrame = 0, this parameter is not specified.
cavlc	option_fixed	false	Enable/disable Context-adaptive variable-length coding mode.
size	string		Resolution of video. Format: WIDTHxHEIGHT.
icq_quality	int	25	Quality of intelligent constant quality algorithm. Possible values: from 1 (the best quality) to 51.
accuracy	int	100	Determines quality of complex scenes in AVBR mode.
convergence	int	0	Determines quality of complex scenes in AVBR mode.
qpi	int	22	Determines quality in CQP mode.
qpb	int	22	Determines quality in CQP mode.
qpp	int	22	Determines quality in CQP mode.
force_gpu	int	0	Force Specified GPU device for encode (0 - first suitable HW device, 1..4 - Use specified HW device)
use_vpp	bool	false	Use Intel VPP for frame conversion and scaling

NVIDIA NVEnc H.264 Encoder

Configuration Parameter: n264

Additional attributes

Name	Type	Default	Description
b	int	5M	The average bit rate in bps is the target bit rate used for rate control
g	int	15	This is the IDR period
bf	int	1	This sets the distance of one P picture from the previous P picture. e.g. for IBBPBBP, set the value as 3
rc_type	option_fixed	Auto	The rate control type
preset	option_fixed	Auto	Codec Preset - if specified, some properties below ignored
profile	option_fixed	Auto	Codec Profile
level	option_fixed	Auto	Sets the level flag in the output bitstream
maxrate	int	0	The maximum bit rate in bps is the peak bit rate used for VBR rate control
size	string		Resolution of video. Format: WIDTHxHEIGHT.
ar	option		Aspect ratio of video.
ar_type	option_fixed		Type of video's aspect ratio.
bufsize	int	0	Specifies the VBV(HRD) buffer size. in bits. Set 0 to use the default VBV buffer size
initialdelay	int	0	Specifies the VBV(HRD) initial delay in bits. Set 0 to use the default VBV initial delay
enableAQ	option_fixed	true	Set this to TRUE to enable adaptive quantization
intraRefreshPeriod	int	0	Specifies the interval between successive intra refresh if intraRefreshCount is set
intraRefreshCount	int	0	Specifies the length of intra refresh in number of frames for periodic intra refresh. This value should be smaller than intraRefreshPeriod
disable_cabac	option_fixed	false	Enable or disable CABAC
mvprecision	option_fixed	Auto	Specifies the desired motion vector prediction precision
disable_sps_pps	option_fixed	false	Disable writing of Sequence and Picture parameter for every IDR frame
separateColourPlaneFlag	option_fixed	false	Set 'true' to enable 4:4:4 separate colour planes
deblock	option_fixed	1	Specifies the deblocking filter mode
enableTemporalSVC	option_fixed	false	Set to 'true' to enable SVC temporal
hierarchicalPFrames	option_fixed	false	Set to 'true' to enable hierarchical PFrames
hierarchicalBFrames	option_fixed	false	Set to 'true' to enable hierarchical BFrames
outputBufferingPeriodSEI	option_fixed	true	Set 'true' to write SEI buffering period syntax in the bitstream
outputPictureTimingSEI	option_fixed	true	Set 'true' to write SEI picture timing syntax in the bitstream
outputFramePackingSEI	option_fixed	true	Set 'true' to enable writing of frame packing arrangement SEI messages to bitstream
outputRecoveryPointSEI	option_fixed	true	Set'true' to enable writing of recovery point SEI message
numTemporalLayers	int		Specifies max temporal layers to be used for hierarchical coding. Valid value range is [1,10]
outputAUD	option_fixed	true	Set 'true' to write Access Unit Delimiter syntax.
maxNumRefFrames	int		Specifies the DPB size used for encoding. Setting it to 0 will let driver use the default dpb size. The low latency application which wants to invalidate reference frame as an error resilience tool is recommended to use a large DPB size so that the encoder can keep old reference frames which can be used if recent
ltrNumFrames	int		Specifies the maximum number of long term references can be used for prediction
ltrTrustMode	option_fixed		Specifies the LTR operating mode. Set to 'false' to disallow encoding using LTR frames until later specified. Set to 'true' to allow encoding using LTR frames unless later invalidated.
enableConstrainedEncoding	option_fixed		Set this to 1 to enable constrainedFrame encoding where each slice in the constarined picture is independent of other slices.
adaptiveTransformMode	option_fixed		Enable the AdaptiveTransform Mode.
fmoMode	option_fixed		Enable the FMO Mode.
interlace	option_fixed	Auto	Interlace type
output.444	option_fixed	false	Enable or disable 444 encoding

NVIDIA NVEnc H.264 Lossless Encoder

Configuration Parameter: l264

Additional attributes

Name	Type	Default	Description
preset	option_fixed	lossless	Codec Preset
size	string		Resolution of video. Format: WIDTHxHEIGHT.
ar	option		Aspect ratio of video.
ar_type	option_fixed		Type of video's aspect ratio.
disable_sps_pps	option_fixed	false	Disable writing of Sequence and Picture parameter for every IDR frame
outputBufferingPeriodSEI	option_fixed	true	Set 'true' to write SEI buffering period syntax in the bitstream
outputPictureTimingSEI	option_fixed	true	Set 'true' to write SEI picture timing syntax in the bitstream
outputFramePackingSEI	option_fixed	true	Set 'true' to enable writing of frame packing arrangement SEI messages to bitstream
outputRecoveryPointSEI	option_fixed	true	Set'true' to enable writing of recovery point SEI message
outputAUD	option_fixed	true	Set 'true' to write Access Unit Delimiter syntax.
output.444	option_fixed	false	Enable or disable 444 encoding

NVIDIA NVEnc H.265 (HEVC) Encoder

Configuration Parameter: n265

Additional attributes

Name	Type	Default	Description
b	int	5M	The average bit rate in bps is the target bit rate used for rate control
g	int	15	This is the IDR period
bf	int	1	This sets the distance of one P picture from the previous P picture. e.g. for IBBPBBP, set the value as 3
rc_type	option_fixed	Auto	The rate control type
preset	option_fixed	Auto	Codec Preset - if specified, some properties below ignored
level	option_fixed	Auto	Specifies the level of the encoded bitstream.
tier	option_fixed	Main
maxrate	int	0	The maximum bit rate in bps is the peak bit rate used for VBR rate control
size	string		Resolution of video. Format: WIDTHxHEIGHT.
ar	option		Aspect ratio of video.
ar_type	option_fixed		Type of video's aspect ratio.
bufsize	int	0	Specifies the VBV(HRD) buffer size. in bits. Set 0 to use the default VBV buffer size
initialdelay	int	0	Specifies the VBV(HRD) initial delay in bits. Set 0 to use the default VBV initial delay
enableAQ	option_fixed	true	Set this to TRUE to enable adaptive quantization
intraRefreshPeriod	int	0	Specifies the interval between successive intra refresh if intraRefreshCount is set
intraRefreshCount	int	0	Specifies the length of intra refresh in number of frames for periodic intra refresh. This value should be smaller than intraRefreshPeriod
mvprecision	option_fixed	Auto	Specifies the desired motion vector prediction precision
disable_sps_pps	option_fixed	false	Disable writing of Sequence and Picture parameter for every IDR frame
deblock	option_fixed	true	Set 'true' to enable in loop filtering across slice boundary.
useConstrainedIntraPred	option_fixed		Set 'true' to enable constrained intra prediction.
outputBufferingPeriodSEI	option_fixed	true	Set 'true' to write SEI buffering period syntax in the bitstream
outputPictureTimingSEI	option_fixed	true	Set 'true' to write SEI picture timing syntax in the bitstream
outputAUD	option_fixed	true	Set 'true' to write Access Unit Delimiter syntax.
enableLTR	option_fixed		Set 'true' to enable use of long term reference pictures for inter prediction.
maxNumRefFramesInDPB	int		Specifies the maximum number of references frames in the DPB.
ltrNumFrames	int		Specifies the maximum number of long term references can be used for prediction
maxTemporalLayersMinus1	int		Specifies the max temporal layer used for hierarchical coding.
output.10bit	option_fixed	false	Specifies the 10 bit encoding mode
output.444	option_fixed	false	Enable or disable 444 encoding

CUDA H.264 Video Encoder

Configuration Parameter: c264

Additional attributes

Name	Type	Default	Description
b	int	6000000	The average bit rate in bps is the target bit rate used for VBR rate control
maxrate	int	6200000	The maximum bit rate in bps is the peak bit rate used for VBR rate control
preset	option	Custom	Set the encoding parameters according to the presets required for supported encoding targets
size	string		Resolution of video. Format: WIDTHxHEIGHT.
g	int	15	This is the IDR period for H264
bf	int	1	This sets the distance of one P picture from the previous P picture. e.g. for IBBPBBP, set the value as 3
dynamic_gop	option_fixed	false	The GOP structure is determined dynamically by the encoder
profile	option_fixed	Main	Set the profile and level information
nal_type	int	0	Configures the NAL unit framing type
rc_type	option_fixed	vbr	The rate control type
qp_level_i	int	28	The QP level for intra pictures
qp_level_p	int	28	The QP level for inter P pictures
qp_level_b	int	28	The QP level for inter B pictures
deblock	option_fixed	true	Enable or disable de-blocking mode
disable_cabac	option_fixed	false	Enable or disable CABAC
disable_sps_pps	option_fixed	false	Enable or disable including sequence parameter set/picture parameter set ( SPS/PPS ) information in bitstream
deinterlace	option_fixed		Enable the deinterlace algorithm

Cisco libopenh264 H.264/MPEG-4 AVC Encoder

Configuration Parameter: libopenh264

Additional attributes

Name	Type	Default	Description
b	int	5000000	Set the bitrate (as a number of bits per second).
maxrate	int	5000000	Set the max bitrate (as a number of bits per second).
profile	option_fixed	Main	Set profile restrictions. If set to the value of ‘main’ enable CABAC.
size	string		Resolution of video. Format: WIDTHxHEIGHT.
g	int	15	Set the GOP size.
slices	int	0	Set the number of slices, used in parallelized encoding. Default value is 0. This is only used when slice_mode is set to ‘fixed’.
slice_mode	option_fixed	auto	Set slice mode.
loopfilter	int	1	Enable loop filter, if set to 1 (automatically enabled). To disable set a value of 0.
max_nal_size	int	0	Set maximum NAL size in bytes.
allow_skip_frames	int	0	Allow skipping frames to hit the target bitrate if set to 1.

libx264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10

Configuration Parameter: libx264

Additional attributes

Name	Type	Default	Description
preset	string	faster	Change options to trade off compression efficiency against encoding speed. Values available: ultrafast, superfast, veryfast, faster, fast, medium, slow, slower, veryslow, placebo.
tune	string	zerolatency	Tune options to further optimize them for your input content. Values available: film, animation, grain, stillimage, psnr, ssim, fastdecode, zerolatency.
profile	string		Limit the profile of the output stream. Values available: baseline, main, high, high10, high422, high444.
fastfirstpass	int	1	Use fast settings when encoding first pass
level	string		Sets the level flag in the output bitstream (as defined by Annex A) Permissible levels are: 1 1b 1.1 1.2 1.3 2 2.1 2.2 3 3.1 3.2 4 4.1 4.2 5 5.1
wpredp	string		Weighted prediction for P-frames
x264opts	string		x264 options
crf	double	-1.000000	Select the quality for constant quality mode
crf_max	double	-1.000000	In CRF mode, prevents VBV from lowering quality beyond this point.
qp	int	-1	Constant quantization parameter rate control method
aq-mode	option_fixed		AQ method
aq_mode			autovariance - Auto-variance AQ (experimental) size - Resolution of video. Format: WIDTHxHEIGHT. ar - Aspect ratio of video. ar_type - Type of video's aspect ratio.
v422	option_fixed	false	Indicates whether captioning used 4:2:2 chroma subsampling (4:2:0 overwise).
interlace	int	-1	Interlacing: 1 - interlaced, 0 - progressive, -1 - auto.
aq-strength	double	-1.000000	AQ strength. Reduces blocking and blurring in flat and textured areas.
psy	int	-1	Use psychovisual optimizations.
psy-rd	string		Strength of psychovisual optimization, in : format.
rc-lookahead	int	-1	Number of frames to look ahead for frametype and ratecontrol
weightb	int	-1	Weighted prediction for B-frames.
weightp	option_fixed		Weighted prediction analysis method.
ssim	int	-1	Calculate and print SSIM stats.
intra-refresh	int	-1	Use Periodic Intra Refresh instead of IDR frames.
b-bias	int	-2147483648	Influences how often B-frames are used
b-pyramid	option_fixed		Keep some B-frames as references.
b_pyramid			normal - Non-strict (not Blu-ray compatible)
mixed-refs	int	-1	One reference per partition, as opposed to one reference per macroblock
8x8dct	int	-1	High profile 8x8 transform.
fast-pskip	int	-1
aud	int	-1	Use access unit delimiters.
mbtree	int	-1	Use macroblock tree ratecontrol.
deblock	string		Loop filter parameters, in form.
cplxblur	double	-1.000000	Reduce fluctuations in QP (before curve compression)
partitions	string		A comma-separated list of partitions to consider. Possible values: p8x8, p4x4, b8x8, i8x8, i4x4, none, all
direct-pred	option_fixed		Direct MV prediction mode
slice-max-size	int	-1	Limit the size of each slice in bytes
stats	string		Filename for 2 pass stats
nal-hrd	option_fixed		Signal HRD information (requires vbv-bufsize; cbr not allowed in .mp4)

Intel QuickSync HEVC Encoder

Configuration Parameter: q265hw

Additional attributes

Name	Type	Default	Description
async_depth	int	4	Maximum processing parallelism
avbr_accuracy	int	0	Accuracy of the AVBR ratecontrol
avbr_convergence	int	0	Convergence of the AVBR ratecontrol
preset	option	medium
vcm	int	0	Use the video conferencing mode ratecontrol
rdo	int	-1	Enable rate distortion optimization
max_frame_size	int	-1	Maximum encoded frame size in bytes
max_slice_size	int	-1	Maximum encoded slice size in bytes
bitrate_limit	int	-1	Toggle bitrate limitations
mbbrc	int	-1	MB level bitrate control
extbrc	int	-1	Extended bitrate control
adaptive_i	int	-1	Adaptive I-frame placement
adaptive_b	int	-1	Adaptive B-frame placement
b_strategy	int	-1	Strategy to choose between I/P/B-frames
idr_interval	option		Distance (in I-frames) between IDR frames begin_only - Output an IDR-frame only at the beginning of the stream
load_plugin	option	hevc_hw	A user plugin to load in an internal session
load_plugins	string		A :-separate list of hexadecimal plugin UIDs to load in an internal session
profile	option	unknown

x265 H.265/HEVC

Configuration Parameter: libx265

Additional attributes

Name	Type	Default	Description
preset	option	superfast	Set the x265 preset.
tune	option		Set the x265 tune parameter. Possible values: psnr (disables adaptive quant, psy-rd, and cutree), ssim (enables adaptive quant auto-mode, disables psy-rd), grain (improves retention of film grain), fastdecode (no loop filters, no weighted pred, no intra in B), zerolatency (no lookahead, no B frames, no cutree).
forced-idr	int	0	Normally, when forcing a I-frame type, the encoder can select any type of I-frame. This option forces it to choose an IDR-frame.
x265-params	string		Set x265 options using a list of key=value couples separated by ":". See x265 -help for a list of options.

FLV / Sorenson Spark / Sorenson H.263 (Flash Video)

Configuration Parameter: flv

Additional attributes

Name	Type	Default	Description
mpv_flags	flags		Flags common for all mpegvideo-based encoders. 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

HuffYUV

Configuration Parameter: huffyuv

VC-1

Configuration Parameter: vc1

MJPEG (Motion JPEG)

Configuration Parameter: mjpeg

MPEG-1 Video

Configuration Parameter: mpeg1video

Additional attributes

Name	Type	Default	Description
mpv_flags	flags		Flags common for all mpegvideo-based encoders. 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

FFV1

Configuration Parameter: ffv1

Additional attributes

Name	Type	Default	Description
coder	option_fixed	0	0=Golomb-Rice, 1=Range Coder, 2=Range Coder (with custom state transition table)
context	option_fixed	0	0=small, 1=large
g	int	1	GOP size. For archival use, GOP-size should be "1".
level	option_fixed	1	Version. Select which FFV1 version to use.
threads	int	1	Threads. The number of threads to use while processing. Adjust this to match how many of your available CPU cores you want to use.
slices	option_fixed	4	Slices. Each frame is split into this number of slices. This affects multithreading performance, as well as filesize: Increasing the number of slices might speed up performance, but also increases the filesize.
slicecrc	option_fixed	0	Error correction/detection. 0=off, 1=on. Enabling this option adds CRC information to each slice. This makes it possible for a decoder to detect errors in the bitstream, rather than blindly decoding a broken slice.

MPEG-2 Video

Configuration Parameter: mpeg2video

Additional attributes

Name	Type	Default	Description
mpv_flags	flags		Flags common for all mpegvideo-based encoders. 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
gop_timecode	string		GOP timecode value
v422	option_fixed	false	Indicates whether captioning used 4:2:2 chroma subsampling (4:2:0 overwise).
interlace	int	-1	Interlacing: 1 - interlaced, 0 - progressive, -1 - auto.

MPEG-4 part 2 Video

Configuration Parameter: mpeg4

Additional attributes

Name	Type	Default	Description
data_partitioning	int	0	Use data partitioning.
mpv_flags	flags		Flags common for all mpegvideo-based encoders. 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
interlace	int	-1	Interlacing: 1 - interlaced, 0 - progressive, -1 - auto.

Apple ProRes

Configuration Parameter: prores

Windows Media Video 8

Configuration Parameter: wmv2

OpenJPEG JPEG 2000

Configuration Parameter: libopenjpeg

Additional attributes

Name	Type	Default	Description
format	option_fixed	jp2	Codec Format. Possible values: j2k, jp2.
profile	option_fixed	jpeg2000	Profile name. Possible values: jpeg2000, cinema2k, cinema4k.
cinema_mode	option_fixed	off	Digital Cinema mode. Possible values: off, 2k_24, 2k_48, 4k_24
numresolution	int	6	Number of resolutions
numlayers	int	1	Number of layers

Google VP8

Configuration Parameter: libvpx

Additional attributes

Name	Type	Default	Description
cpu-used	int	3	Quality/Speed ratio modifier
quality	int	1000000	Encoding quality
max-intra-rate	int	-1	Maximum I-frame bitrate (pct) 0=unlimited
er			partitions - The frame partitions are independently decodable by the bool decoder, meaning that partitions can be decoded even though earlier partitions have been lost. Note that intra predicition is still done over the partition boundary.
speed	int	3	Encoding speed
crf	int	0	Select the quality for constant quality mode

AMD AMF H.264 Encoder

Configuration Parameter: h264_amf

Additional attributes

Name	Type	Default	Description
b	int	5M	The average bit rate in bps is the target bit rate used for VBR rate control
g	int	15	Group of picture (GOP) size
maxrate	int	0	Set max bitrate tolerance (in bits/s). Requires bufsize to be set
minrate	int	0	Set min bitrate tolerance (in bits/s). Most useful in setting up a CBR encode. It is of little use elsewise
bufsize	int	0	Set ratecontrol buffer size (in bits). Depends on the profile level of the video being encoded. Set only if you're encoding for a hardware device.
bf	int	0	This sets the distance of one P picture from the previous P picture. e.g. for IBBPBBP, set the value as 3
usage	option_fixed	transcoding	Encoder Usage
profile	option_fixed	main	Profile
level	option_fixed	auto	Profile Level
quality	option_fixed	speed	Quality Preference
rc	option_fixed	cqp	Rate Control Method
enforce_hrd	bool	false	Enforce HRD
filler_data	bool	false	Filler Data Enable
vbaq	bool	false	Enable VBAQ
frame_skipping	bool	false	Rate Control Based Frame Skip
qp_i	int	-1	Quantization Parameter for I-Frame
qp_p	int	-1	Quantization Parameter for P-Frame
qp_b	int	-1	Quantization Parameter for B-Frame
preanalysis	bool	false	Pre-Analysis Mode
max_au_size	int	0	Maximum Access Unit Size for rate control (in bits)
header_spacing	int	-1	Header Insertion Spacing
bf_delta_qp	int	4	B-Picture Delta QP
bf_ref	bool	true	Enable Reference to B-Frames
bf_ref_delta_qp	int	4	Reference B-Picture Delta QP
intra_refresh_mb	int	0	Intra Refresh MBs Number Per Slot in Macroblocks
coder	option_fixed	auto	Coding Type
me_half_pel	bool	true	Enable ME Half Pixel
me_quarter_pel	bool	true	Enable ME Quarter Pixel
aud	bool	false	Inserts AU Delimiter NAL unit

AMD AMF H.265 (HEVC) Encoder

Configuration Parameter: hevc_amf

Additional attributes

Name	Type	Default	Description
b	int	5M	The average bit rate in bps is the target bit rate used for VBR rate control
g	int	15	Group of picture (GOP) size
maxrate	int	0	Set max bitrate tolerance (in bits/s). Requires bufsize to be set
minrate	int	0	Set min bitrate tolerance (in bits/s). Most useful in setting up a CBR encode. It is of little use elsewise
bufsize	int	0	Set ratecontrol buffer size (in bits). Depends on the profile level of the video being encoded. Set only if you're encoding for a hardware device.
bf	int	1	This sets the distance of one P picture from the previous P picture. e.g. for IBBPBBP, set the value as 3
usage	option_fixed	transcoding	Encoder Usage
profile	option_fixed	main	Profile
profile_tier	option_fixed	main	Profile tier
level	option_fixed	auto	Profile Level
quality	option_fixed	balanced	Quality Preference
rc	option_fixed	cqp	Rate Control Method
header_insertion_mode	option_fixed	none	Header insertion mode
gops_per_idr	int	60	GOPs per IDR 0-no IDR will be inserted
preanalysis	bool	false	Pre-Analysis Mode
vbaq	bool	false	Enable VBAQ
enforce_hrd	bool	false	Enforce HRD
filler_data	bool	false	Filler Data Enable
max_au_size	int	0	Maximum Access Unit Size for rate control (in bits)
min_qp_i	int	-1	Min quantization parameter for I-frame
max_qp_i	int	-1	Max quantization parameter for I-frame
min_qp_p	int	-1	Min quantization parameter for P-frame
max_qp_p	int	-1	Max quantization parameter for P-frame
qp_p	int	-1	Quantization parameter for P-frame
qp_i	int	-1	Quantization parameter for I-frame
skip_frame	bool	false	Rate Control Based Frame Skip
me_half_pel	bool	true	Enable ME Half Pixel
me_quarter_pel	bool	true	Enable ME Quarter Pixel
aud	bool	false	Inserts AU Delimiter NAL unit

libvpx VP9

Configuration Parameter: libvpx-vp9

Additional attributes

Name	Type	Default	Description
auto-alt-ref	int	-1	Enable use of alternate reference frames (2-pass only)
lag-in-frames	int	25	Number of frames to look ahead for alternate reference frame selection
arnr-maxframes	int	0	altref noise reduction max frame count
arnr-strength	int	3	altref noise reduction filter strength
arnr-type	option	centered	altref noise reduction filter type
arnr_type	int	3	altref noise reduction filter type
tune	option		Tune the encoding to a specific scenario
deadline	option	good	Time to spend encoding, in microseconds.
quality	int	1000000
error-resilient	flags		Error resilience configuration
max-intra-rate	int	-1	Maximum I-frame bitrate (pct) 0=unlimited
er			partitions - The frame partitions are independently decodable by the bool decoder, meaning that partitions can be decoded even though earlier partitions have been lost. Note that intra predicition is still done over the partition boundary.
crf	int	-1	Select the quality for constant quality mode
static-thresh	int	0	A change threshold on blocks below which they will be skipped by the encoder
drop-threshold	int	0	Frame drop threshold
noise-sensitivity	int	0	Noise sensitivity
undershoot-pct	int	-1	Datarate undershoot (min) target (%)
overshoot-pct	int	-1	Datarate overshoot (max) target (%)
cpu-used	int	1	Quality/Speed ratio modifier
lossless	int	-1	Lossless mode
tile-columns	int	-1	Number of tile columns to use, log2
tile-rows	int	-1	Number of tile rows to use, log2
frame-parallel			Enable frame parallel decodability features
aq-mode	option		adaptive quantization mode
aq_mode			variance - Variance based Aq complexity - Complexity based Aq cyclic - Cyclic Refresh Aq equator360 - 360 video Aq
level	double	-1.000000	Specify level
row-mt			Row based multi-threading
tune-content	option		Tune content type
tune_content			screen - Screen capture content film - Film content; improves grain retention
corpus-complexity	int	-1	corpus vbr complexity midpoint
speed	int	1
vp8flags	flags
flags			altref - enable use of alternate reference frames (VP8/2-pass only)
arnr_max_frames	int	0	altref noise reduction max frame count
arnr_strength	int	3	altref noise reduction filter strength
rc_lookahead	int	25	Number of frames to look ahead for alternate reference frame selection

DNxHD (Digital Nonlinear Extensible High Definition)

Configuration Parameter: dnxhd

Additional attributes

Name	Type	Default	Description
b	int	120M	Set bitrate (in bits/s)
nitris_compat	bool	false	Encode with Avid Nitris compatibility

QuickTime Animation (RLE) video

Configuration Parameter: qtrle