Audio and video codecs – Medialooks Help Center

Audio Codecs

General Audio Attributes

Common attributes; codec-specific attributes below override these definitions.

Additional attributes

An empty Default cell means that no preset default is specified. Encoder defaults, where known, are included in the description.

Name	Type	Default	Description
b	int	128K	Target audio bitrate in bits/s. Supports unit prefixes such as `K`.
ar	int		Audio sample rate in Hz. Supported sample rates depend on the selected encoder.
flags	flags		Additional flags. Supported values: `global_header`, `bitexact`. `global_header`: Place global headers in extradata instead of every keyframe `bitexact`: Use only bitexact stuff (except (i)dct)
maxrate	int		Set max bitrate tolerance (in bits/s). Requires bufsize to be set
minrate	int		Set min bitrate tolerance (in bits/s). Most useful in setting up a CBR encode. It is of little use elsewise
bufsize	int		Set rate control buffer size in bits.
bt	int		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 minimum/maximum bitrate. Lowering tolerance too much has an adverse effect on quality. (from 0 to INT_MAX) (default 4000000)
flags2	flags		FFmpeg audio flags2 (default 0). Supported values: `fixed_frame_size`. `fixed_frame_size`: Force a fixed frame size
export_side_data	flags		Export metadata as side data (default 0) Supported values: `prft`. `prft`: export Producer Reference Time through packet side data
cutoff	int		set cutoff bandwidth (from INT_MIN to INT_MAX) (default 0)
frame_size	int		FFmpeg frame_size option. (from 0 to INT_MAX) (default 0)
strict	option		how strictly to follow the standards (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental things
err_detect	flags		set error detection flags (default 0) Supported values: `crccheck`, `bitstream`, `buffer`, `explode`, `ignore_err`, `careful`, `compliant`, `aggressive`. `crccheck`: verify embedded CRCs `bitstream`: detect bitstream specification deviations `buffer`: detect improper bitstream length `explode`: abort decoding on minor error detection `ignore_err`: ignore errors `careful`: consider things that violate the spec, are fast to check and have not been seen in the wild as errors `compliant`: consider all spec non compliancies as errors `aggressive`: consider things that a sane encoder should not do as an error
global_quality	int		FFmpeg global_quality option. (from INT_MIN to INT_MAX) (default 0)
threads	option		set the number of threads (from 0 to INT_MAX) (default 1) Supported values: `auto`. `auto`: 0: autodetect a suitable number of threads to use
profile	int		Generic FFmpeg codec profile number. Valid profiles depend on the selected encoder; use its named profile selector when available.
level	option		encoding level, usually corresponding to the profile level, codec-specific (from INT_MIN to INT_MAX) (default unknown) Supported values: `unknown`. `unknown`: -99: unknown
trellis	int		rate-distortion optimal quantization (from INT_MIN to INT_MAX) (default 0)
compression_level	int		FFmpeg compression_level option. (from INT_MIN to INT_MAX) (default -1)
ch_layout	string		FFmpeg ch_layout option.
thread_type	flags		select multithreading type (default slice+frame) Supported values: `slice`, `frame`.
audio_service_type	option		audio service type (from 0 to 8) (default ma) Supported values: `ma`, `ef`, `vi`, `hi`, `di`, `co`, `em`, `vo`, `ka`. `ma`: 0: Main Audio Service `ef`: 1: Effects `vi`: 2: Visually Impaired `hi`: 3: Hearing Impaired `di`: 4: Dialogue `co`: 5: Commentary `em`: 6: Emergency `vo`: 7: Voice Over `ka`: 8: Karaoke
dump_separator	string		set information dump field separator
max_pixels	string		Maximum number of pixels (from 0 to INT_MAX) (default INT_MAX)
max_samples	string		Maximum number of samples (from 0 to INT_MAX) (default INT_MAX)

AAC (Advanced Audio Coding)

Configuration Parameter: aac

Additional attributes

Name	Type	Default	Description
aac_coder	int	1	Set AAC encoder coding method. Possible values: 0 - twoloop, 1 - fast Supported values: `twoloop`, `fast`. `twoloop`: Two loop searching method `fast`: Fast search Range: minimum 0.0; maximum 1.0.
profile	option_fixed	unknown	Profile of AAC coding. Possible values: unknown, aac_low, mpeg2_aac_low Supported values: `unknown`, `aac_low`, `mpeg2_aac_low`.
aac_ms	option_fixed		Force M/S stereo coding (default auto) Supported values: `auto`, `false`, `true`.
aac_is	option_fixed		Intensity stereo coding (default true) Supported values: `false`, `true`.
aac_pns	option_fixed		Perceptual noise substitution (default true) Supported values: `false`, `true`.
aac_tns	option_fixed		Temporal noise shaping (default true) Supported values: `false`, `true`.
aac_pce	option_fixed		Forces the use of PCEs (default false) Supported values: `false`, `true`.

AC-3 (Dolby Digital, Fixed-Point)

Configuration Parameter: ac3_fixed

Additional attributes

Name	Type	Description
center_mixlev	double	Center Mix Level. The amount of gain the decoder should apply to the center channel when downmixing to stereo. This field will only be written to the bitstream if a center channel is present. The value is specified as a scale factor Range: minimum 0.0; maximum 1.0.
surround_mixlev	double	Surround Mix Level. The amount of gain the decoder should apply to the surround channel(s) when downmixing to stereo. This field will only be written to the bitstream if one or more surround channels are present. The value is specified as a scale factor Range: minimum 0.0; maximum 1.0.
mixing_level	int	Mixing Level. Specifies peak sound pressure level (SPL) in the production environment when the mix was mastered. Valid values are 80 to 111, or -1 for unknown or not indicated. The default value is -1, but that value cannot be used if the Audio Production Information is written to the bitstream. Therefore, if the room_type option is not the default value, the mixing_level option must not be -1 Range: minimum -1.0; maximum 111.0.
copyright	int	Copyright Bit. Specifies whether a copyright exists for this audio Range: minimum -1.0; maximum 1.0.
dsur_mode	option_fixed	Dolby Surround Mode Not Indicated (default)Dolby Surround EncodedNot Dolby Surround Encoded Supported values: `notindicated`, `on`, `off`.
ltrt_cmixlev	double	Lt/Rt Center Mix Level. The amount of gain the decoder should apply to the center channel when downmixing to stereo in Lt/Rt mode Range: minimum -1.0; maximum 2.0.
ltrt_surmixlev	double	Lt/Rt Surround Mix Level. The amount of gain the decoder should apply to the surround channel(s) when downmixing to stereo in Lt/Rt mode Range: minimum -1.0; maximum 2.0.
loro_cmixlev	double	Lo/Ro Center Mix Level. The amount of gain the decoder should apply to the center channel when downmixing to stereo in Lo/Ro mode Range: minimum -1.0; maximum 2.0.
loro_surmixlev	double	Lo/Ro Surround Mix Level. The amount of gain the decoder should apply to the surround channel(s) when downmixing to stereo in Lo/Ro mode Range: minimum -1.0; maximum 2.0.
room_type	option	Room Type (from -1 to 2) (default -1) Supported values: `notindicated`, `large`, `small`. `notindicated`: 0: Not Indicated (default) `large`: 1: Large Room `small`: 2: Small Room
per_frame_metadata	option_fixed	Allow Changing Metadata Per-Frame (default false) Supported values: `false`, `true`.
dialnorm	int	Dialogue Level (dB) (from -31 to -1) (default -31)
original	int	Original Bit Stream (from -1 to 1) (default -1)
dmix_mode	option	Preferred Stereo Downmix Mode (from -1 to 3) (default -1) Supported values: `notindicated`, `ltrt`, `loro`, `dplii`. `notindicated`: 0: Not Indicated (default) `ltrt`: 1: Lt/Rt Downmix Preferred `loro`: 2: Lo/Ro Downmix Preferred `dplii`: 3: Dolby Pro Logic II Downmix Preferred
dsurex_mode	option	Dolby Surround EX Mode (from -1 to 3) (default -1) Supported values: `notindicated`, `on`, `off`, `dpliiz`. `notindicated`: 0: Not Indicated (default) `on`: 2: Dolby Surround EX Encoded `off`: 1: Not Dolby Surround EX Encoded `dpliiz`: 3: Dolby Pro Logic IIz-encoded
dheadphone_mode	option	Dolby Headphone Mode (from -1 to 2) (default -1) Supported values: `notindicated`, `on`, `off`. `notindicated`: 0: Not Indicated (default) `on`: 2: Dolby Headphone Encoded `off`: 1: Not Dolby Headphone Encoded
ad_conv_type	option	A/D Converter Type (from -1 to 1) (default -1) Supported values: `standard`, `hdcd`. `standard`: 0: Standard (default) `hdcd`: 1: HDCD
stereo_rematrixing	option_fixed	Stereo Rematrixing (default true) Supported values: `false`, `true`.
channel_coupling	option	Channel Coupling (from -1 to 1) (default auto) Supported values: `auto`. `auto`: -1: Selected by the Encoder
cpl_start_band	option	Coupling Start Band (from -1 to 15) (default auto) Supported values: `auto`. `auto`: -1: Selected by the Encoder

AC-3 (Dolby Digital, Floating-Point)

Configuration Parameter: ac3

Additional attributes

Name	Type	Default	Description
center_mixlev	double	0.594604	Center Mix Level. The amount of gain the decoder should apply to the center channel when downmixing to stereo. This field will only be written to the bitstream if a center channel is present. The value is specified as a scale factor Range: minimum 0.0; maximum 1.0.
surround_mixlev	double	0.500000	Surround Mix Level. The amount of gain the decoder should apply to the surround channel(s) when downmixing to stereo. This field will only be written to the bitstream if one or more surround channels are present. The value is specified as a scale factor Range: minimum 0.0; maximum 1.0.
mixing_level	int	-1	Mixing Level. Specifies peak sound pressure level (SPL) in the production environment when the mix was mastered. Valid values are 80 to 111, or -1 for unknown or not indicated. The default value is -1, but that value cannot be used if the Audio Production Information is written to the bitstream. Therefore, if the room_type option is not the default value, the mixing_level option must not be -1 Range: minimum -1.0; maximum 111.0.
room_type	option		Room Type. Describes the equalization used during the final mixing session at the studio or on the dubbing stage. A large room is a dubbing stage with the industry standard X-curve equalization; a small room has flat equalization. This field will not be written to the bitstream if both the mixing_level option and the room_type option have the default values Not Indicated (default)Large RoomSmall Room Supported values: `notindicated`, `large`, `small`.
per_frame_metadata	option_fixed		Allow Changing Metadata Per-Frame. Specifies if the encoder should check for changing metadata for each frame Supported values: `false`, `true`.
copyright	int	-1	Copyright Bit. Specifies whether a copyright exists for this audio Range: minimum -1.0; maximum 1.0.
dialnorm	int	-31	Dialogue Normalization. Indicates how far the average dialogue level of the program is below digital 100% full scale (0 dBFS). This parameter determines a level shift during audio reproduction that sets the average volume of the dialogue to a preset level. The goal is to match volume level between program sources. A value of -31dB will result in no volume level change, relative to the source volume, during audio reproduction. Valid values are whole numbers in the range -31 to -1, with -31 being the default
dsur_mode	option		Dolby Surround Mode. Specifies whether the stereo signal uses Dolby Surround (Pro Logic). This field will only be written to the bitstream if the audio stream is stereo. Using this option does NOT mean the encoder will actually apply Dolby Surround processing Not Indicated (default)Dolby Surround EncodedNot Dolby Surround Encoded Supported values: `notindicated`, `on`, `off`.
original	int	-1	Original Bit Stream Indicator. Specifies whether this audio is from the original source and not a copy Range: minimum -1.0; maximum 1.0.
dmix_mode	option		Preferred Stereo Downmix Mode. Allows the user to select either Lt/Rt (Dolby Surround) or Lo/Ro (normal stereo) as the preferred stereo downmix mode Not Indicated (default)Lt/Rt Downmix PreferredLo/Ro Downmix PreferredDolby Pro Logic II Downmix Preferred Supported values: `notindicated`, `ltrt`, `loro`, `dplii`.
ltrt_cmixlev	double	-1.000000	Lt/Rt Center Mix Level. The amount of gain the decoder should apply to the center channel when downmixing to stereo in Lt/Rt mode Range: minimum -1.0; maximum 2.0.
ltrt_surmixlev	double	-1.000000	Lt/Rt Surround Mix Level. The amount of gain the decoder should apply to the surround channel(s) when downmixing to stereo in Lt/Rt mode Range: minimum -1.0; maximum 2.0.
loro_cmixlev	double	-1.000000	Lo/Ro Center Mix Level. The amount of gain the decoder should apply to the center channel when downmixing to stereo in Lo/Ro mode Range: minimum -1.0; maximum 2.0.
loro_surmixlev	double	-1.000000	Lo/Ro Surround Mix Level. The amount of gain the decoder should apply to the surround channel(s) when downmixing to stereo in Lo/Ro mode Range: minimum -1.0; maximum 2.0.
dsurex_mode	option		Dolby Surround EX Mode. Indicates whether the stream uses Dolby Surround EX (7.1 matrixed to 5.1). Using this option does NOT mean the encoder will actually apply Dolby Surround EX processing Not Indicated (default)Dolby Surround EX EncodedNot Dolby Surround EX EncodedDolby Pro Logic IIz-encoded Supported values: `notindicated`, `on`, `off`, `dpliiz`.
dheadphone_mode	option		Dolby Headphone Mode. Indicates whether the stream uses Dolby Headphone encoding (multi-channel matrixed to 2.0 for use with headphones). Using this option does NOT mean the encoder will actually apply Dolby Headphone processing Not Indicated (default)Dolby Headphone EncodedNot Dolby Headphone Encoded Supported values: `notindicated`, `on`, `off`.
ad_conv_type	option		A/D Converter Type. Indicates whether the audio has passed through HDCD A/D conversion Standard (default)HDCD Supported values: `standard`, `hdcd`.
stereo_rematrixing	option_fixed		Stereo Rematrixing. Enables/Disables use of rematrixing for stereo input. This is an optional AC-3 feature that increases quality by selectively encoding the left/right channels as mid/side. This option is enabled by default, and it is highly recommended that it be left as enabled except for testing purposes Supported values: `false`, `true`.
channel_coupling	option	auto	Enables/Disables use of channel coupling, which is an optional AC-3 feature that increases quality by combining high frequency information from multiple channels into a single channel. The per-channel high frequency information is sent with less accuracy in both the frequency and time domains. This allows more bits to be used for lower frequencies while preserving enough information to reconstruct the high frequencies. This option is enabled by default for the floating-point encoder and should generally be left as enabled except for testing purposes or to increase encoding speed Selected by the Encoder Supported values: `auto`.
cpl_start_band	option	auto	Coupling Start Band. Sets the channel coupling start band, from 1 to 15. If a value higher than the bandwidth is used, it will be reduced to 1 less than the coupling end band. If auto is used, the start band will be determined by the encoder based on the bit rate, sample rate, and channel layout. This option has no effect if channel coupling is disabled Selected by the Encoder Supported values: `auto`.

ADPCM IMA QuickTime

Configuration Parameter: adpcm_ima_qt

ADPCM Microsoft

Configuration Parameter: adpcm_ms

Additional attributes

Name	Type	Default	Description
block_size	int		set the block size (from 32 to 8192) (default 1024)

ALAC (Apple Lossless)

Configuration Parameter: alac

Additional attributes

Name	Type	Description
min_prediction_order	int	FFmpeg min_prediction_order option. (from 1 to 30) (default 4)
max_prediction_order	int	FFmpeg max_prediction_order option. (from 1 to 30) (default 6)
compression_level	int	ALAC compression level: -1 selects the FFmpeg default (2); 0 disables prediction, 1 uses a fast predictor, 2 uses the full predictor search. Range: minimum -1; maximum 2.

E-AC-3 (Dolby Digital Plus)

Configuration Parameter: eac3

Additional attributes

Name	Type	Default	Description
mixing_level	int	-1	Mixing Level Range: minimum -1.0; maximum 111.0.
copyright	int	-1	Copyright Bit. Specifies whether a copyright exists for this audio Range: minimum -1.0; maximum 1.0.
dsur_mode	option_fixed		Dolby Surround Mode Not Indicated (default)Dolby Surround EncodedNot Dolby Surround Encoded Supported values: `notindicated`, `on`, `off`.
ltrt_cmixlev	double	-1.000000	Lt/Rt Center Mix Level. The amount of gain the decoder should apply to the center channel when downmixing to stereo in Lt/Rt mode Range: minimum -1.0; maximum 2.0.
ltrt_surmixlev	double	-1.000000	Lt/Rt Surround Mix Level. The amount of gain the decoder should apply to the surround channel(s) when downmixing to stereo in Lt/Rt mode Range: minimum -1.0; maximum 2.0.
loro_cmixlev	double	-1.000000	Lo/Ro Center Mix Level. The amount of gain the decoder should apply to the center channel when downmixing to stereo in Lo/Ro mode Range: minimum -1.0; maximum 2.0.
loro_surmixlev	double	-1.000000	Lo/Ro Surround Mix Level. The amount of gain the decoder should apply to the surround channel(s) when downmixing to stereo in Lo/Ro mode Range: minimum -1.0; maximum 2.0.
room_type	option		Room Type (from -1 to 2) (default -1) Supported values: `notindicated`, `large`, `small`. `notindicated`: 0: Not Indicated (default) `large`: 1: Large Room `small`: 2: Small Room
per_frame_metadata	option_fixed		Allow Changing Metadata Per-Frame (default false) Supported values: `false`, `true`.
dialnorm	int		Dialogue Level (dB) (from -31 to -1) (default -31)
original	int		Original Bit Stream (from -1 to 1) (default -1)
dmix_mode	option		Preferred Stereo Downmix Mode (from -1 to 3) (default -1) Supported values: `notindicated`, `ltrt`, `loro`, `dplii`. `notindicated`: 0: Not Indicated (default) `ltrt`: 1: Lt/Rt Downmix Preferred `loro`: 2: Lo/Ro Downmix Preferred `dplii`: 3: Dolby Pro Logic II Downmix Preferred
dsurex_mode	option		Dolby Surround EX Mode (from -1 to 3) (default -1) Supported values: `notindicated`, `on`, `off`, `dpliiz`. `notindicated`: 0: Not Indicated (default) `on`: 2: Dolby Surround EX Encoded `off`: 1: Not Dolby Surround EX Encoded `dpliiz`: 3: Dolby Pro Logic IIz-encoded
dheadphone_mode	option		Dolby Headphone Mode (from -1 to 2) (default -1) Supported values: `notindicated`, `on`, `off`. `notindicated`: 0: Not Indicated (default) `on`: 2: Dolby Headphone Encoded `off`: 1: Not Dolby Headphone Encoded
ad_conv_type	option		A/D Converter Type (from -1 to 1) (default -1) Supported values: `standard`, `hdcd`. `standard`: 0: Standard (default) `hdcd`: 1: HDCD
stereo_rematrixing	option_fixed		Stereo Rematrixing (default true) Supported values: `false`, `true`.
channel_coupling	option		Channel Coupling (from -1 to 1) (default auto) Supported values: `auto`. `auto`: -1: Selected by the Encoder
cpl_start_band	option		Coupling Start Band (from -1 to 15) (default auto) Supported values: `auto`. `auto`: -1: Selected by the Encoder

FLAC (Free Lossless)

Configuration Parameter: flac

Additional attributes

Name	Type	Default	Description
lpc_coeff_precision	int	15	Sets the LPC coefficient precision, valid values are from 1 to 15, 15 is the default
lpc_type	option_fixed		LPC algorithm. Possible values: none, fixed, levinson, cholesky Supported values: `none`, `fixed`, `levinson`, `cholesky`.
lpc_passes	int	2	Number of passes to use for Cholesky factorization during LPC analysis Range: minimum 1; maximum 2147483647.
min_partition_order	int	-1	Minimal partition order Range: minimum -1; maximum 8.
max_partition_order	int	-1	Maximal partition order Range: minimum -1; maximum 8.
prediction_order_method	option_fixed		Search method for selecting prediction order Supported values: `estimation`, `2level`, `4level`, `8level`, `search`, `log`. `estimation`: estimation `search`: search `log`: log
ch_mode	option_fixed	auto	Stereo decorrelation mode. Possible values: auto, indep, left_side, right_side, mid_side Supported values: `auto`, `indep`, `left_side`, `right_side`, `mid_side`.
exact_rice_parameters	option_fixed		Calculate rice parameters exactly (default false) Supported values: `false`, `true`.
multi_dim_quant	option_fixed		Multi-dimensional quantization (default false) Supported values: `false`, `true`.
min_prediction_order	int		FFmpeg min_prediction_order option. (from -1 to 32) (default -1)
max_prediction_order	int		FFmpeg max_prediction_order option. (from -1 to 32) (default -1)
compression_level	int		FLAC compression level (0 to 12). Higher values trade encoding speed for compression. -1 selects the FFmpeg default (5). Range: minimum -1; maximum 12.

MP2 (MPEG Audio Layer 2)

Configuration Parameter: mp2

MP3 (LAME, MPEG Audio Layer 3)

Configuration Parameter: libmp3lame

Additional attributes

Name	Type	Description
reservoir	option_fixed	use bit reservoir (default true) Supported values: `false`, `true`.
joint_stereo	option_fixed	use joint stereo (default true) Supported values: `false`, `true`.
abr	option_fixed	use ABR (default false) Supported values: `false`, `true`.
copyright	option_fixed	set copyright flag (default false) Supported values: `false`, `true`.
original	option_fixed	set original flag (default true) Supported values: `false`, `true`.
global_quality	int	VBR quality in FFmpeg lambda units: multiply the LAME quality (0 to 9, lower is better) by 118; for example 472 selects quality 4. Requires flags=+qscale. Without qscale, bitrate/ABR settings apply. Range: minimum 0; maximum 1179.
compression_level	int	LAME algorithm quality (0 to 9): 0 is slowest/best, 9 is fastest. -1 leaves the library default. This controls encoding effort, not the target VBR quality. Range: minimum -1; maximum 9.
flags	flags	Audio encoding flags. Set +qscale to enable quality based VBR using global_quality. Supported values: `qscale`, `global_header`, `bitexact`. `qscale`: Use constant quality VBR instead of a target bitrate. `global_header`: Place global headers in extradata. `bitexact`: Use only bitexact algorithms.

Ogg Vorbis

Configuration Parameter: libvorbis

Note that above 50 kHz, VBR with a quality setting of 3 is used automatically instead of the unsupported fixed-bitrate mode. The sample rate and number of channels are preserved; the specified 'audio::b' value is ignored. You can change quality setting by the following attribute:

Name	Type	Description
global_quality	int	VBR quality in FFmpeg lambda units: multiply the Vorbis quality (-1 to 10, higher is better) by 118; for example 472 selects quality 4. Requires flags=+qscale: the writer sets b (default 128K), and with a bitrate libvorbis ignores global_quality. Range: minimum -118; maximum 1180.
iblock	double	Sets the impulse block bias (from -15 to 0) (default 0)
flags	flags	Audio encoding flags. Set +qscale to enable quality based VBR using global_quality. Supported values: `qscale`, `global_header`, `bitexact`. `qscale`: Use constant quality VBR instead of a target bitrate. `global_header`: Place global headers in extradata. `bitexact`: Use only bitexact algorithms.

Opus (libopus)

Configuration Parameter: libopus

Additional attributes:

Name	Type	Default	Description
application	option_fixed	audio	Encoding application: `audio` — general audio and music; `voip` — speech; `lowdelay` — lowest-delay modes. Supported values: `audio`, `voip`, `lowdelay`. `audio`: General audio and music `voip`: Favor speech intelligibility `lowdelay`: Restrict to the lowest-delay modes, disabling voice-optimized modes
vbr	option_fixed	on	Bitrate mode: `off` — constant bitrate; `on` — variable bitrate; `constrained` — constrained variable bitrate. Supported values: `off`, `on`, `constrained`. `off`: Constant bitrate `on`: Variable bitrate `constrained`: Constrained variable bitrate
compression_level	int	10	Encoding complexity, from `0` to `10`. Higher values improve quality at the cost of encoding speed.
frame_duration	double	20	Set audio frame duration in milliseconds. Supported values: 2.5, 5, 10, 20, 40, 60, 80, 100, 120. Values below 10 ms use the restricted low-delay mode Range: minimum 2.5; maximum 120.0.
packet_loss	int	0	Expected packet loss percentage, from `0` to `100`.
fec	bool	false	Enables in-band forward error correction. Requires a non-zero `packet_loss` value.
mapping_family	int	-1	Set channel mapping family: -1 - automatic, 0 - mono/stereo, 1 - surround (up to 8 channels), 255 - independent streams Range: minimum -1.0; maximum 255.0.
apply_phase_inv	bool	true	Enables intensity-stereo phase inversion. Disabling it can improve mono downmix quality.
cutoff	int	0	Set audio bandwidth cutoff in Hz. Supported values: 0 (automatic), 4000, 6000, 8000, 12000, 20000 Range: minimum 0.0; maximum 20000.0.
ar	int		Set audio sampling rate in Hz. Supported values: 8000, 12000, 16000, 24000, 48000
dtx	option_fixed		Enable DTX (Discontinuous transmission) (default false) Supported values: `false`, `true`.

PCM 16-bit Signed LE

Configuration Parameter: pcm_s16le

PCM 24-bit D-Cinema

Configuration Parameter: pcm_s24daud

PCM 24-bit Signed LE

Configuration Parameter: pcm_s24le

PCM 32-bit Float LE

Configuration Parameter: pcm_f32le

PCM 32-bit Signed LE

Configuration Parameter: pcm_s32le

Video Codecs

General Video Attributes

Common attributes; codec-specific attributes below override these definitions.

Additional attributes

An empty Default cell means that no preset default is specified. Encoder defaults, where known, are included in the description.

Name	Type	Default	Description
b	int	5M	Set video bitrate (in bits/s). Support unit prefixes such as K or M
bt	int		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		Supported values: `gray`, `ildct`, `low_delay`, `ilme`, `cgop`. `gray`: Only decode/encode grayscale `ildct`: Use interlaced dct `low_delay`: Force low delay `ilme`: Apply interlaced motion estimation `cgop`: Closed GOP
size	string		Resolution of video. Format: WIDTHxHEIGHT.
ar	option		Aspect ratio of video. Supported values: `16:9`, `4:3`.
ar_type	option_fixed		Type of video's aspect ratio. Supported values: `crop`, `letter-box`, `none`.
g	int		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		Video quantizer scale compression (VBR). Constant of ratecontrol equation. Recommended range for default rc_eq: 0.0-1.0
qmin	int		Min video quantizer scale (VBR) Range: minimum -1.0; maximum 69.0.
qmax	int		Max video quantizer scale (VBR) Range: minimum -1.0; maximum 1024.0.
qdiff	int		Max difference between the quantizer scale (VBR)
bf	int		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 Range: minimum -1.0; maximum 16.0.
maxrate	int		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		Set min bitrate tolerance (in bits/s). Most useful in setting up a CBR encode. It is of little use elsewise.
bufsize	int		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		Qscale difference between I-frames and P-frames.
dct	option_fixed	auto	DCT algorithm Supported values: `auto`, `fastint`, `int`, `mmx`, `altivec`, `faan`. `auto`: Autoselect a good one (default) `fastint`: Fast integer `int`: Accurate integer `mmx`: MMX `altivec`: Altivec `faan`: Floating point AAN DCT
cmp	option_fixed		Full pel motion estimation compare function Supported values: `sad`, `sse`, `satd`, `dct`, `bit`, `rd`, `zero`, `vsad`, `vsse`, `nsse`, `w53`, `w97`, `dctmax`, `chroma`. `sad`: Sum of absolute differences, fast (default) `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		Sub pel motion estimation quality
me_range	int		MErange controls the max range of the motion search.
rc_init_occupancy	int	0	Number of bits which should be loaded into the rc buffer before decoding starts
threads	string	auto	Threads. The number of threads to use while processing. Adjust this to match how many of your available CPU cores you want to use.
tag	string		Codec's tag (for example, 'xvid')
scaling_quality	string		scaling quality for video encoding
refs	int		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.
rc_max_vbv_use	double	0.0	Maximal rate control of video buffer verifier's usage
rc_min_vbv_use	double	3.0	Minimal rate control of video buffer verifier's usage
slices	int	0	Number of slices, used in parallelized encoding Range: minimum 0.0.
top	int		Field order for interlaced files (-1 - auto, 0 - bottom first, 1 - top first) Range: minimum -1; maximum 1.
thread_type	flags	+slice+frame	Select multithreading type Supported values: `slice`, `frame`. `slice`: Slice `frame`: Frame
flags2	flags		FFmpeg flags2 option. (default 0) Supported values: `fast`, `noout`, `local_header`, `fixed_frame_size`. `fast`: allow non-spec-compliant speedup tricks `noout`: skip bitstream encoding `local_header`: place global headers at every keyframe instead of in extradata `fixed_frame_size`: Force a fixed frame size
export_side_data	flags		Export metadata as side data (default 0) Supported values: `prft`. `prft`: export Producer Reference Time through packet side data
qblur	double		video quantizer scale blur (VBR) (from -1 to FLT_MAX) (default 0.5)
b_qfactor	double		QP factor between P- and B-frames (from -FLT_MAX to FLT_MAX) (default 1.25)
strict	option		how strictly to follow the standards (from INT_MIN to INT_MAX) (default normal) Supported values: `very`, `strict`, `normal`, `unofficial`, `experimental`. `very`: 2: strictly conform to a older more strict version of the spec or reference software `strict`: 1: strictly conform to all the things in the spec no matter what the consequences `normal`: 0: normal `unofficial`: -1: allow unofficial extensions `experimental`: -2: allow non-standardized experimental things
b_qoffset	double		QP offset between P- and B-frames (from -FLT_MAX to FLT_MAX) (default 1.25)
err_detect	flags		set error detection flags (default 0) Supported values: `crccheck`, `bitstream`, `buffer`, `explode`, `ignore_err`, `careful`, `compliant`, `aggressive`. `crccheck`: verify embedded CRCs `bitstream`: detect bitstream specification deviations `buffer`: detect improper bitstream length `explode`: abort decoding on minor error detection `ignore_err`: ignore errors `careful`: consider things that violate the spec, are fast to check and have not been seen in the wild as errors `compliant`: consider all spec non compliancies as errors `aggressive`: consider things that a sane encoder should not do as an error
i_qoffset	double		QP offset between P- and I-frames (from -FLT_MAX to FLT_MAX) (default 0)
lumi_mask	double		compresses bright areas stronger than medium ones (from -FLT_MAX to FLT_MAX) (default 0)
tcplx_mask	double		temporal complexity masking (from -FLT_MAX to FLT_MAX) (default 0)
scplx_mask	double		spatial complexity masking (from -FLT_MAX to FLT_MAX) (default 0)
p_mask	double		inter masking (from -FLT_MAX to FLT_MAX) (default 0)
dark_mask	double		compresses dark areas stronger than medium ones (from -FLT_MAX to FLT_MAX) (default 0)
idct	option		select IDCT implementation (from 0 to INT_MAX) (default auto) Supported values: `auto`, `int`, `simple`, `simplemmx`, `arm`, `altivec`, `simplearm`, `simplearmv5te`, `simplearmv6`, `simpleneon`, `xvid`, `xvidmmx`, `faani`, `simpleauto`. `auto`: 0: auto `int`: 1: int `simple`: 2: simple `simplemmx`: 3: simplemmx `arm`: 7: arm `altivec`: 8: altivec `simplearm`: 10: simplearm `simplearmv5te`: 16: simplearmv5te `simplearmv6`: 17: simplearmv6 `simpleneon`: 22: simpleneon `xvid`: 14: xvid `xvidmmx`: 14: deprecated, for compatibility only `faani`: 20: floating point AAN IDCT `simpleauto`: 128: simpleauto
aspect	string		sample aspect ratio (from 0 to 10) (default 0/1)
sar	string		sample aspect ratio (from 0 to 10) (default 0/1)
debug	flags		print specific debug info (default 0) Supported values: `rc`. `rc`: rate control
dia_size	int		diamond type & size for motion estimation (from INT_MIN to INT_MAX) (default 0)
last_pred	int		amount of motion predictors from the previous frame (from INT_MIN to INT_MAX) (default 0)
pre_dia_size	int		diamond type & size for motion estimation pre-pass (from INT_MIN to INT_MAX) (default 0)
global_quality	int		FFmpeg global_quality option. (from INT_MIN to INT_MAX) (default 0)
mbd	option		macroblock decision algorithm (high quality mode) (from 0 to 2) (default simple) Supported values: `simple`, `bits`, `rd`. `simple`: 0: use mbcmp `bits`: 1: use fewest bits `rd`: 2: use best rate distortion
nssew	int		nsse weight (from INT_MIN to INT_MAX) (default 8)
profile	int		Generic FFmpeg codec profile number. Valid profiles depend on the selected encoder; use its named profile selector when available.
level	option		encoding level, usually corresponding to the profile level, codec-specific (from INT_MIN to INT_MAX) (default unknown) Supported values: `unknown`. `unknown`: -99: unknown
subcmp	option		sub-pel ME compare function (from INT_MIN to INT_MAX) (default sad) Supported values: `sad`, `sse`, `satd`, `dct`, `psnr`, `bit`, `rd`, `zero`, `vsad`, `vsse`, `nsse`, `w53`, `w97`, `dctmax`, `chroma`, `msad`. `sad`: 0: sum of absolute differences, fast `sse`: 1: sum of squared errors `satd`: 2: sum of absolute Hadamard transformed differences `dct`: 3: sum of absolute DCT transformed differences `psnr`: 4: sum of squared quantization errors (avoid, low quality) `bit`: 5: number of bits needed for the block `rd`: 6: rate distortion optimal, slow `zero`: 7: 0 `vsad`: 8: sum of absolute vertical differences `vsse`: 9: sum of squared vertical differences `nsse`: 10: noise preserving sum of squared differences `w53`: 11: 5/3 wavelet, only used in snow `w97`: 12: 9/7 wavelet, only used in snow `dctmax`: 13: dctmax `chroma`: 256: chroma `msad`: 15: sum of absolute differences, median predicted
mbcmp	option		macroblock compare function (from INT_MIN to INT_MAX) (default sad) Supported values: `sad`, `sse`, `satd`, `dct`, `psnr`, `bit`, `rd`, `zero`, `vsad`, `vsse`, `nsse`, `w53`, `w97`, `dctmax`, `chroma`, `msad`. `sad`: 0: sum of absolute differences, fast `sse`: 1: sum of squared errors `satd`: 2: sum of absolute Hadamard transformed differences `dct`: 3: sum of absolute DCT transformed differences `psnr`: 4: sum of squared quantization errors (avoid, low quality) `bit`: 5: number of bits needed for the block `rd`: 6: rate distortion optimal, slow `zero`: 7: 0 `vsad`: 8: sum of absolute vertical differences `vsse`: 9: sum of squared vertical differences `nsse`: 10: noise preserving sum of squared differences `w53`: 11: 5/3 wavelet, only used in snow `w97`: 12: 9/7 wavelet, only used in snow `dctmax`: 13: dctmax `chroma`: 256: chroma `msad`: 15: sum of absolute differences, median predicted
ildctcmp	option		interlaced DCT compare function (from INT_MIN to INT_MAX) (default vsad) Supported values: `sad`, `sse`, `satd`, `dct`, `psnr`, `bit`, `rd`, `zero`, `vsad`, `vsse`, `nsse`, `w53`, `w97`, `dctmax`, `chroma`, `msad`. `sad`: 0: sum of absolute differences, fast `sse`: 1: sum of squared errors `satd`: 2: sum of absolute Hadamard transformed differences `dct`: 3: sum of absolute DCT transformed differences `psnr`: 4: sum of squared quantization errors (avoid, low quality) `bit`: 5: number of bits needed for the block `rd`: 6: rate distortion optimal, slow `zero`: 7: 0 `vsad`: 8: sum of absolute vertical differences `vsse`: 9: sum of squared vertical differences `nsse`: 10: noise preserving sum of squared differences `w53`: 11: 5/3 wavelet, only used in snow `w97`: 12: 9/7 wavelet, only used in snow `dctmax`: 13: dctmax `chroma`: 256: chroma `msad`: 15: sum of absolute differences, median predicted
precmp	option		pre motion estimation compare function (from INT_MIN to INT_MAX) (default sad) Supported values: `sad`, `sse`, `satd`, `dct`, `psnr`, `bit`, `rd`, `zero`, `vsad`, `vsse`, `nsse`, `w53`, `w97`, `dctmax`, `chroma`, `msad`. `sad`: 0: sum of absolute differences, fast `sse`: 1: sum of squared errors `satd`: 2: sum of absolute Hadamard transformed differences `dct`: 3: sum of absolute DCT transformed differences `psnr`: 4: sum of squared quantization errors (avoid, low quality) `bit`: 5: number of bits needed for the block `rd`: 6: rate distortion optimal, slow `zero`: 7: 0 `vsad`: 8: sum of absolute vertical differences `vsse`: 9: sum of squared vertical differences `nsse`: 10: noise preserving sum of squared differences `w53`: 11: 5/3 wavelet, only used in snow `w97`: 12: 9/7 wavelet, only used in snow `dctmax`: 13: dctmax `chroma`: 256: chroma `msad`: 15: sum of absolute differences, median predicted
mblmin	int		minimum macroblock Lagrange factor (VBR) (from 1 to 32767) (default 236)
mblmax	int		maximum macroblock Lagrange factor (VBR) (from 1 to 32767) (default 3658)
bidir_refine	int		refine the two motion vectors used in bidirectional macroblocks (from 0 to 4) (default 1)
keyint_min	int		minimum interval between IDR-frames (from INT_MIN to INT_MAX) (default 25)
mv0_threshold	int		FFmpeg mv0_threshold option. (from 0 to INT_MAX) (default 256)
compression_level	int		FFmpeg compression_level option. (from INT_MIN to INT_MAX) (default -1)
color_primaries	option		color primaries (from 1 to INT_MAX) (default unknown) Supported values: `bt709`, `unknown`, `bt470m`, `bt470bg`, `smpte170m`, `smpte240m`, `film`, `bt2020`, `smpte428`, `smpte428_1`, `smpte431`, `smpte432`, `jedec-p22`, `ebu3213`, `unspecified`. `bt709`: 1: BT.709 `unknown`: 2: Unspecified `bt470m`: 4: BT.470 M `bt470bg`: 5: BT.470 BG `smpte170m`: 6: SMPTE 170 M `smpte240m`: 7: SMPTE 240 M `film`: 8: Film `bt2020`: 9: BT.2020 `smpte428`: 10: SMPTE 428-1 `smpte428_1`: 10: SMPTE 428-1 `smpte431`: 11: SMPTE 431-2 `smpte432`: 12: SMPTE 422-1 `jedec-p22`: 22: JEDEC P22 `ebu3213`: 22: EBU 3213-E `unspecified`: 2: Unspecified
color_trc	option		color transfer characteristics (from 1 to INT_MAX) (default unknown) Supported values: `bt709`, `unknown`, `gamma22`, `bt470m`, `gamma28`, `bt470bg`, `smpte170m`, `smpte240m`, `linear`, `log100`, `log316`, `iec61966-2-4`, `bt1361e`, `iec61966-2-1`, `bt2020-10`, `bt2020-12`, `smpte2084`, `smpte428`, `arib-std-b67`, `unspecified`, `log`, `log_sqrt`, `iec61966_2_4`, `bt1361`, `iec61966_2_1`, `bt2020_10bit`, `bt2020_12bit`, `smpte428_1`. `bt709`: 1: BT.709 `unknown`: 2: Unspecified `gamma22`: 4: BT.470 M `bt470m`: 4: BT.470 M `gamma28`: 5: BT.470 BG `bt470bg`: 5: BT.470 BG `smpte170m`: 6: SMPTE 170 M `smpte240m`: 7: SMPTE 240 M `linear`: 8: Linear `log100`: 9: Log `log316`: 10: Log square root `iec61966-2-4`: 11: IEC 61966-2-4 `bt1361e`: 12: BT.1361 `iec61966-2-1`: 13: IEC 61966-2-1 `bt2020-10`: 14: BT.2020 - 10 bit `bt2020-12`: 15: BT.2020 - 12 bit `smpte2084`: 16: SMPTE 2084 `smpte428`: 17: SMPTE 428-1 `arib-std-b67`: 18: ARIB STD-B67 `unspecified`: 2: Unspecified `log`: 9: Log `log_sqrt`: 10: Log square root `iec61966_2_4`: 11: IEC 61966-2-4 `bt1361`: 12: BT.1361 `iec61966_2_1`: 13: IEC 61966-2-1 `bt2020_10bit`: 14: BT.2020 - 10 bit `bt2020_12bit`: 15: BT.2020 - 12 bit `smpte428_1`: 17: SMPTE 428-1
colorspace	option		color space (from 0 to INT_MAX) (default unknown) Supported values: `rgb`, `bt709`, `unknown`, `fcc`, `bt470bg`, `smpte170m`, `smpte240m`, `ycgco`, `bt2020nc`, `bt2020c`, `smpte2085`, `chroma-derived-nc`, `chroma-derived-c`, `ictcp`, `ipt-c2`, `unspecified`, `ycocg`, `ycgco-re`, `ycgco-ro`, `bt2020_ncl`, `bt2020_cl`. `rgb`: 0: RGB `bt709`: 1: BT.709 `unknown`: 2: Unspecified `fcc`: 4: FCC `bt470bg`: 5: BT.470 BG `smpte170m`: 6: SMPTE 170 M `smpte240m`: 7: SMPTE 240 M `ycgco`: 8: YCGCO `bt2020nc`: 9: BT.2020 NCL `bt2020c`: 10: BT.2020 CL `smpte2085`: 11: SMPTE 2085 `chroma-derived-nc`: 12: Chroma-derived NCL `chroma-derived-c`: 13: Chroma-derived CL `ictcp`: 14: ICtCp `ipt-c2`: 15: IPT-C2 `unspecified`: 2: Unspecified `ycocg`: 8: YCGCO `ycgco-re`: 16: YCgCo-R, even add. `ycgco-ro`: 17: YCgCo-R, odd add. `bt2020_ncl`: 9: BT.2020 NCL `bt2020_cl`: 10: BT.2020 CL
color_range	option		color range (from 0 to INT_MAX) (default unknown) Supported values: `unknown`, `tv`, `pc`, `unspecified`, `mpeg`, `jpeg`, `limited`, `full`. `unknown`: 0: Unspecified `tv`: 1: MPEG (2192^(n-8)) `pc`: 2: JPEG (2^n-1) `unspecified`: 0: Unspecified `mpeg`: 1: MPEG (2192^(n-8)) `jpeg`: 2: JPEG (2^n-1) `limited`: 1: MPEG (219*2^(n-8)) `full`: 2: JPEG (2^n-1)
chroma_sample_location	option		chroma sample location (from 0 to INT_MAX) (default unknown) Supported values: `unknown`, `left`, `center`, `topleft`, `top`, `bottomleft`, `bottom`, `unspecified`. `unknown`: 0: Unspecified `left`: 1: Left `center`: 2: Center `topleft`: 3: Top-left `top`: 4: Top `bottomleft`: 5: Bottom-left `bottom`: 6: Bottom `unspecified`: 0: Unspecified
alpha_mode	option		alpha mode (from 0 to INT_MAX) (default unknown) Supported values: `unknown`, `unspecified`, `premultiplied`, `straight`. `unknown`: 0: Unspecified `unspecified`: 0: Unspecified `premultiplied`: 1: Premultiplied `straight`: 2: Straight
field_order	option		Field order (from 0 to 5) (default 0) Supported values: `progressive`, `tt`, `bb`, `tb`, `bt`. `progressive`: 1: progressive `tt`: 2: tt `bb`: 3: bb `tb`: 4: tb `bt`: 5: bt
dump_separator	string		set information dump field separator
max_pixels	string		Maximum number of pixels (from 0 to INT_MAX) (default INT_MAX)

Apple ProRes (iCodec Pro, SW)

Configuration Parameter: prores_ks

Additional attributes

Name	Type	Default	Description
mbs_per_slice	int	8	Macroblocks per slice Range: minimum 1.0; maximum 8.0.
profile	option	auto	FFmpeg profile option. (from -1 to 5) (default auto) Supported values: `auto`, `proxy`, `lt`, `standard`, `hq`, `4444`, `4444xq`. `proxy`: proxy `standard`: standard `hq`: hq
vendor	string	Lavc	Vendor ID
bits_per_mb	int	0	Desired bits per macroblock Range: minimum 0.0; maximum 8192.0.
quant_mat	option	auto	Quantiser matrix Supported values: `auto`, `proxy`, `lt`, `standard`, `hq`, `default`. `auto`: auto `proxy`: proxy `lt`: lt `standard`: standard `hq`: hq `default`: default
alpha_bits	int	16	Bits for alpha plane Range: minimum 0.0; maximum 16.0.

Apple ProRes (Legacy, SW)

Configuration Parameter: prores

Additional attributes

Name	Type	Default	Description
profile	int		Set the profile: 0=Proxy, 1=LT, 2=standard, 3=HQ Supported values: `0`, `1`, `2`, `3`. Range: minimum 0; maximum 3.
vendor	string		vendor ID (default "fmpg")

AV1 (FFmpeg VPL-MSDK, HW)

Configuration Parameter: av1_qsv

'ffmpeg_av1_qsv.enable' property enabled is required!

Additional attributes

Name	Type	Default	Description
async_depth	int	4	Maximum processing parallelism (from 1 to INT_MAX)
preset	option_fixed		Change options to trade off compression efficiency against encoding speed Supported values: `veryfast`, `faster`, `fast`, `medium`, `slow`, `slower`, `veryslow`. `veryfast`: veryfast `faster`: faster `fast`: fast `medium`: medium `slow`: slow `slower`: slower `veryslow`: veryslow
forced_idr	bool	false	Forcing I frames as IDR frames
low_power	bool		enable low power mode(experimental: many limitations by mfx version, BRC modes, etc.) (default auto)
b_strategy	int	-1	Strategy to choose between I/P/B-frames (from -1 to 1)
adaptive_i	int	-1	Adaptive I-frame placement (from -1 to 1)
adaptive_b	int	-1	Adaptive B-frame placement (from -1 to 1)
extbrc	int	-1	Extended bitrate control (from -1 to 1)
low_delay_brc	bool		Allow to strictly obey avg frame size (default auto)
max_frame_size	int	-1	Maximum encoded frame size in bytes (from -1 to INT_MAX)
max_frame_size_i	int	-1	Maximum encoded I frame size in bytes (from -1 to INT_MAX)
max_frame_size_p	int	-1	Maximum encoded P frame size in bytes (from -1 to INT_MAX)
profile	option	unknown	Used profile (from 0 to INT_MAX) Supported values: `unknown`, `main`. `unknown`: unknown `main`: main
tile_cols	int	0	Number of columns for tiled encoding (from 0 to 65535)
tile_rows	int	0	Number of rows for tiled encoding (from 0 to 65535)
look_ahead_depth	int	0	Depth of look ahead in number frames (from 0 to 100)
qsv_params	string		Set QSV encoder parameters as key1=value1:key2=value2:...

AV1 (NVIDIA NVENC, HW)

Configuration Parameter: nav1

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	30	This is the IDR period
bf	int		This sets the distance of one P picture from the previous P picture. e.g. for IBBPBBP, set the value as 3 Range: minimum 1; maximum 17.
rc_type	option_fixed	Auto	The rate control type Supported values: `Auto`, `cbr`, `vbr`, `cqp`.
preset	option_fixed	default	Codec Preset - if specified, some properties below ignored Supported values: `default`, `high_performance`, `high_quality`, `blue_ray_disk`, `low_latency`, `low_latency_hq`, `low_latency_hp`, `lossless`, `lossless_hp`, `p1`, `p2`, `p3`, `p4`, `p5`, `p6`, `p7`.
tuning_info	option_fixed	high_quality	Codec Tuning Info - if specified, some properties below ignored Supported values: `high_quality`, `low_latency`, `ultra_low_latency`.
level	option_fixed	Auto	Specifies the level of the encoded bitstream Supported values: `Auto`, `2.0`, `2.1`, `2.2`, `2.3`, `3.0`, `3.1`, `3.2`, `3.3`, `4.0`, `4.1`, `4.2`, `4.3`, `5.0`, `5.1`, `5.2`, `5.3`, `6.0. 6.1`, `6.2`, `6.3`, `7.0. 7.1`, `7.2`, `7.3`.
tier	option_fixed	Main	Supported values: `Main`, `High`.
maxrate	int		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. Supported values: `16:9`, `4:3`.
ar_type	option_fixed		Type of video's aspect ratio Supported values: `crop`, `letter-box`, `none`.
bufsize	int		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 Supported values: `true`, `false`.
outputAnnexBFormat	option_fixed		Set 'true' to use Annex B format for bitstream output Supported values: `true`, `false`.
enableTimingInfo	option_fixed		Set 'true' to write Timing Info into sequence/frame headers Supported values: `true`, `false`.
enableDecoderModelInfo	option_fixed		Set 'true' to write Decoder Model Info into sequence/frame headers. Supported values: `true`, `false`.
enableFrameIdNumbers	option_fixed		Set 'true' to write Frame id numbers in bitstream. Supported values: `true`, `false`.
disableSeqHdr	option_fixed		Set 'true' to disable Sequence Header signaling in the bitstream Supported values: `true`, `false`.
repeatSeqHdr	option_fixed		Set 'true' to output Sequence Header for every Key frame Supported values: `true`, `false`.
enableBitstreamPadding	option_fixed		Set 'true' to enable bitstream padding Supported values: `true`, `false`.
idrPeriod	int		Specifies the IDR/Key frame interval. If not set, this is made equal to gopLength in NV_ENC_CONFIG.Low latency application client can set IDR interval to NVENC_INFINITE_GOPLENGTH so that IDR frames are not inserted automatically
intraRefreshPeriod	int	0	Specifies the interval between successive intra refresh if enableIntrarefresh is set. Requires enableIntraRefresh to be set.
intraRefreshCnt	int	0	Specifies the length of intra refresh in number of frames for periodic intra refresh. This value should be smaller than intraRefreshPeriod.
maxNumRefFramesInDPB	int		Specifies the maximum number of references frames in the DPB
maxTemporalLayersMinus1	int		Specifies the max temporal layer used for hierarchical coding
numFwdRefs	int		Specifies max number of forward reference frame used for prediction of a frame. It must be in range 1-4 (Last, Last2, last3 and Golden). It's a suggestive value not necessarily be honored always
numBwdRefs	int		Specifies max number of L1 list reference frame used for prediction of a frame. It must be in range 1-3 (Backward, Altref2, Altref). It's a suggestive value not necessarily be honored always
numTileColumns	int		The picture will be uniformly divided into numTileColumns tile columns. If numTileColumns is not a power of 2, it will be rounded down to the next power of 2 value. If numTileColumns == 0, the picture will be coded with the smallest number of vertical tiles as allowed by standard
numTileRows	int		The picture will be uniformly divided into numTileRows tile rows. If numTileRows is not a power of 2, it will be rounded down to the next power of 2 value. If numTileRows == 0, the picture will be coded with the smallest number of horizontal tiles as allowed by standard
output.10bit	option_fixed	false	Output bit depth: auto follows the input frame, true requests 10-bit, false requests 8-bit. Requires support for the selected codec on the GPU. Supported values: `auto`, `false`, `true`.
qpi	int	25	Determines I-frame quality in CQP mode
qpp	int	28	Determines P-frame quality in CQP mode
qpb	int	31	Determines B-frame quality in CQP mode
targetQuality	int	0	Set target quality level (0 to 51, 0 means automatic) for constant quality mode in VBR rate control (default 0)
lowDelayKeyFrameScale	int	0	Specifies the Scene Change frame size increase allowed in case of single frame VBV and CBR (from 0 to 255, default 0)
async_encode	option_fixed		Enable asynchronous NVENC submission. Requires a driver/device mode that supports asynchronous encoding. Supported values: `false`, `true`.
bufsize.msec	int		VBV duration in milliseconds. A positive value derives the VBV size from average bitrate and takes precedence over bufsize/vbvBufferSize. (from 0 to 2147483647)
dynamic_resolution	option_fixed		Reserve encoder dimensions of at least 4096x2160 for resolution changes; availability depends on the device and codec. Supported values: `false`, `true`.
enableInitialRCQP	option_fixed		Enable initial QP values from initialQPI, initialQPP and initialQPB. Supported values: `false`, `true`.
enableMaxQP	option_fixed		Enable maximum QP limits from maxQPI, maxQPP and maxQPB. Supported values: `false`, `true`.
enableMinQP	option_fixed		Enable minimum QP limits from minQPI, minQPP and minQPB. Supported values: `false`, `true`.
force_gpu	int		NVENC device index. A negative value uses the default device. (from -1 to 2147483647)
initialQPB	int		Initial QP for B frames. Used when enableInitialRCQP is enabled; the valid QP range depends on codec/bit depth. (from 0 to 255)
initialQPI	int		Initial QP for I frames. Used when enableInitialRCQP is enabled; the valid QP range depends on codec/bit depth. (from 0 to 255)
initialQPP	int		Initial QP for P frames. Used when enableInitialRCQP is enabled; the valid QP range depends on codec/bit depth. (from 0 to 255)
maxQPB	int		Maximum QP for B frames. Used when enableMaxQP is enabled; the valid QP range depends on codec/bit depth. (from 0 to 255)
maxQPI	int		Maximum QP for I frames. Used when enableMaxQP is enabled; the valid QP range depends on codec/bit depth. (from 0 to 255)
maxQPP	int		Maximum QP for P frames. Used when enableMaxQP is enabled; the valid QP range depends on codec/bit depth. (from 0 to 255)
minQPB	int		Minimum QP for B frames. Used when enableMinQP is enabled; the valid QP range depends on codec/bit depth. (from 0 to 255)
minQPI	int		Minimum QP for I frames. Used when enableMinQP is enabled; the valid QP range depends on codec/bit depth. (from 0 to 255)
minQPP	int		Minimum QP for P frames. Used when enableMinQP is enabled; the valid QP range depends on codec/bit depth. (from 0 to 255)
mvprecision	option		Motion-vector precision; the selected codec/GPU must support it. Supported values: `Auto`, `Full`, `Half`, `Quarter`. `Auto`: Auto `Full`: Full `Half`: Half `Quarter`: Quarter
useBFramesAsRef	option		B-frame reference mode: 0 disables B references, 1 allows each B-frame, 2 uses a middle B-frame. Requires codec/GPU support. (from 0 to 2) Supported values: `0`, `1`, `2`.
vbvBufferSize	string		VBV buffer size in bits. Takes precedence over bufsize; a positive bufsize.msec overrides both.
vbvInitialDelay	string		Initial VBV occupancy in bits. Takes precedence over initialdelay.

DNxHD (Avid, SW)

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
ibias	int		intra quant bias (from INT_MIN to INT_MAX) (default 0)
profile	option		FFmpeg profile option. (from 0 to 5) (default dnxhd) Supported values: `dnxhd`, `dnxhr_444`, `dnxhr_hqx`, `dnxhr_hq`, `dnxhr_sq`, `dnxhr_lb`. `dnxhd`: 0: dnxhd `dnxhr_444`: 5: dnxhr_444 `dnxhr_hqx`: 4: dnxhr_hqx `dnxhr_hq`: 3: dnxhr_hq `dnxhr_sq`: 2: dnxhr_sq `dnxhr_lb`: 1: dnxhr_lb

DPX (Digital Picture eXchange, SW)

Configuration Parameter: dpx

DV / DVCPRO HD (SW)

Configuration Parameter: dvvideo

Additional attributes

Name	Type	Default	Description
dv_format	option_fixed	auto	DV variant: dvsd, dv25, dv50, dvhd; auto picks by input (HD: dvhd, packed SD: dv50, planar SD: dv25). The x64 build supports dvsd and dv25 only. Supported values: `dvsd`, `dv25`, `dv50`, `dvhd`.
quant_deadzone	int		Quantizer dead zone (from 0 to 1024) (default 7)

FFV1 (Lossless, SW)

Configuration Parameter: ffv1

Additional attributes

Name	Type	Default	Description
coder	option_fixed	0	0/rice = Golomb-Rice; range_def (-2) = range coder with default table; 2/range_tab = range coder with custom table; 1/ac is a deprecated alias of range_tab. Supported values: `0`, `1`, `2`, `rice`, `range_def`, `range_tab`, `ac`. `rice`: Golomb rice `range_def`: Range with default table `range_tab`: Range with custom table `ac`: Range with custom table (the ac option exists for compatibility and is deprecated)
context	option_fixed	0	0 = small, 1 = large Supported values: `0`, `1`. Range: minimum 0; maximum 1.
g	int	1	GOP size. For archival use, GOP-size should be "1".
level	option_fixed		Version. Select which FFV1 version to use. Supported values: `0`, `1`, `2`, `3`.
threads	string	auto	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. Supported values: `4`, `6`, `9`, `12`, `16`, `24`, `30`.
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. Supported values: `0`, `1`. Range: minimum -1; maximum 2.
qtable	option		Quantization table (from -1 to 2) (default default) Supported values: `default`, `8bit`, `greater8bit`. `default`: -1: default `greater8bit`: 1: greater8bit
remap_mode	option		Remap Mode (from -1 to 2) (default auto) Supported values: `auto`, `off`, `dualrle`, `flipdualrle`. `auto`: -1: Automatic `off`: 0: Disabled `dualrle`: 1: Dual RLE `flipdualrle`: 2: Dual RLE
remap_optimizer	int		Remap Optimizer (from 0 to 5) (default 3)

FLV / Sorenson Spark (H.263, SW)

Configuration Parameter: flv

Additional attributes

Name	Type	Description
mpv_flags	flags	Flags common for all mpegvideo-based encoders. RD optimal MB level residual skippingStrictly enforce GOP sizeUse rate distortion optimization for qp selectionuse rate distortion optimization for CBP Supported values: `skip_rd`, `strict_gop`, `qp_rd`, `cbp_rd`, `naq`, `mv0`. `naq`: normalize adaptive quantization `mv0`: always try a mb with mv=<0,0>
luma_elim_threshold	int	single coefficient elimination threshold for luminance (negative values also consider dc coefficient) (from INT_MIN to INT_MAX) (default 0)
chroma_elim_threshold	int	single coefficient elimination threshold for chrominance (negative values also consider dc coefficient) (from INT_MIN to INT_MAX) (default 0)
quantizer_noise_shaping	int	FFmpeg quantizer_noise_shaping option. (from 0 to INT_MAX) (default 0)
error_rate	int	Simulate errors in the bitstream to test error concealment. (from 0 to INT_MAX) (default 0)
qsquish	double	how to keep quantizer between qmin and qmax (0 = clip, 1 = use differentiable function) (from 0 to 99) (default 0)
rc_qmod_amp	double	experimental quantizer modulation (from -FLT_MAX to FLT_MAX) (default 0)
rc_qmod_freq	int	experimental quantizer modulation (from INT_MIN to INT_MAX) (default 0)
rc_eq	string	Set rate control equation. When computing the expression, besides the standard functions defined in the section 'Expression Evaluation', the following functions are available: bits2qp(bits), qp2bits(qp). Also the following constants are available: iTex pTex tex mv fCode iCount mcVar var isI isP isB avgQP qComp avgIITex avgPITex avgPPTex avgBPTex avgTex.
rc_init_cplx	double	initial complexity for 1-pass encoding (from -FLT_MAX to FLT_MAX) (default 0)
rc_buf_aggressivity	double	currently useless (from -FLT_MAX to FLT_MAX) (default 1)
border_mask	double	increase the quantizer for macroblocks close to borders (from -FLT_MAX to FLT_MAX) (default 0)
skip_threshold	int	Frame skip threshold (from INT_MIN to INT_MAX) (default 0)
skip_factor	int	Frame skip factor (from INT_MIN to INT_MAX) (default 0)
skip_exp	int	Frame skip exponent (from INT_MIN to INT_MAX) (default 0)
skip_cmp	option	Frame skip compare function (from INT_MIN to INT_MAX) (default dctmax) Supported values: `sad`, `sse`, `satd`, `dct`, `psnr`, `bit`, `rd`, `zero`, `vsad`, `vsse`, `nsse`, `dct264`, `dctmax`, `chroma`, `msad`. `sad`: 0: Sum of absolute differences, fast `sse`: 1: Sum of squared errors `satd`: 2: Sum of absolute Hadamard transformed differences `dct`: 3: Sum of absolute DCT transformed differences `psnr`: 4: Sum of squared quantization errors, low quality `bit`: 5: Number of bits needed for the block `rd`: 6: Rate distortion optimal, slow `zero`: 7: Zero `vsad`: 8: Sum of absolute vertical differences `vsse`: 9: Sum of squared vertical differences `nsse`: 10: Noise preserving sum of squared differences `dct264`: 14: dct264 `dctmax`: 13: dctmax `chroma`: 256: chroma `msad`: 15: Sum of absolute differences, median predicted
noise_reduction	int	Noise reduction (from INT_MIN to INT_MAX) (default 0)
ps	int	RTP payload size in bytes (from INT_MIN to INT_MAX) (default 0)
motion_est	option	motion estimation algorithm (from 0 to 2) (default epzs) Supported values: `zero`, `epzs`, `xone`. `zero`: 0: zero `epzs`: 1: epzs `xone`: 2: xone
mepc	int	Motion estimation bitrate penalty compensation (1.0 = 256) (from INT_MIN to INT_MAX) (default 256)
mepre	int	pre motion estimation (from INT_MIN to INT_MAX) (default 0)
intra_penalty	int	Penalty for intra blocks in block decision (from 0 to 1.07374e+09) (default 0)
lmin	int	minimum Lagrange factor (VBR) (from 0 to INT_MAX) (default 236)
lmax	int	maximum Lagrange factor (VBR) (from 0 to INT_MAX) (default 3658)
sc_threshold	int	Scene change threshold (from INT_MIN to INT_MAX) (default 0)

H.264 AVC (AMD AMF, HW)

Configuration Parameter: a264

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	30	Group of picture (GOP) size
bf	int	-1	B Picture Pattern (from -1 to 3)
profile	option_fixed		Profile Supported values: `main`, `high`, `constrained_baseline`, `constrained_high`.
level	option_fixed	auto	Profile Level Supported values: `auto`, `1.0`, `1.1`, `1.2`, `1.3`, `2.0`, `2.1`, `2.2`, `3.0`, `3.1`, `3.2`, `4.0`, `4.1`, `4.2`, `5.0`, `5.1`, `5.2`, `6.0`, `6.1`, `6.2`.
latency	bool		Enables low latency mode
quality	option_fixed	balanced	Set the encoding quality preset (FFmpeg alias: preset). Supported values: `balanced`, `speed`, `quality`, `high_quality`.
rc	option_fixed	qvbr	Rate Control Method Supported values: `cqp`, `cbr`, `vbr_peak`, `vbr_latency`, `qvbr`, `hqvbr`, `hqcbr`.
qvbr_quality_level	int	-1	Sets the QVBR quality level (from -1 to 51)
enforce_hrd	bool		Enforce HRD
filler_data	bool		Filler Data Enable
vbaq	bool		Enable VBAQ
frame_skipping	bool		Rate Control Based Frame Skip
qp_i	int	-1	Quantization Parameter for I-Frame (from -1 to 51)
qp_p	int	-1	Quantization Parameter for P-Frame (from -1 to 51)
qp_b	int	-1	Quantization Parameter for B-Frame (from -1 to 51)
preencode	bool		Pre-encode assisted rate control
max_au_size	int	-1	Maximum Access Unit Size for rate control (in bits) (from -1 to 2147483647)
header_spacing	int	-1	Header Insertion Spacing (from -1 to 1000)
async_depth	int	16	Set maximum encoding parallelism. Higher values increase output latency. (from 1 to 16) (default 16)
bf_delta_qp	int	4	B-Picture Delta QP (from -10 to 10) (default 4)
bf_ref	bool		Enable Reference to B-Frames
bf_ref_delta_qp	int	4	Reference B-Picture Delta QP (from -10 to 10) (default 4)
max_b_frames	int	-1	Maximum number of consecutive B Pictures (from -1 to 3)
intra_refresh_mb	int	-1	Intra Refresh MBs Number Per Slot in Macroblocks (from -1 to 2147483647)
coder	option_fixed	auto	Coding Type Supported values: `auto`, `cavlc`, `cabac`.
high_motion_quality_boost_enable	bool		Enable High motion quality boost mode
me_half_pel	bool		Enable ME Half Pixel
me_quarter_pel	bool		Enable ME Quarter Pixel
forced_idr	bool		Force I frames to be IDR frames
aud	bool		Inserts AU Delimiter NAL unit
smart_access_video	bool		Enable Smart Access Video to enhance performance by utilizing both APU and dGPU memory access
preanalysis	bool		Enable preanalysis
pa_activity_type	option_fixed		Set the type of activity analysis Supported values: `-1`, `y`, `yuv`.
pa_scene_change_detection_enable	bool		Enable scene change detection
pa_scene_change_detection_sensitivity	option_fixed		Set the sensitivity of scene change detection Supported values: `-1`, `low`, `medium`, `high`.
pa_static_scene_detection_enable	bool		Enable static scene detection
pa_static_scene_detection_sensitivity	option_fixed		Set the sensitivity of static scene detection Supported values: `-1`, `low`, `medium`, `high`.
pa_initial_qp_after_scene_change	int	-1	The QP value that is used immediately after a scene change (from -1 to 51)
pa_max_qp_before_force_skip	int	-1	The QP threshold to allow a skip frame (from -1 to 51)
pa_caq_strength	option_fixed		Content Adaptive Quantization strength Supported values: `-1`, `low`, `medium`, `high`.
pa_frame_sad_enable	bool		Enable Frame SAD algorithm
pa_ltr_enable	bool		Enable long term reference frame management
pa_lookahead_buffer_depth	int	-1	Sets the PA lookahead buffer size (from -1 to 41)
pa_paq_mode	option_fixed		Sets the perceptual adaptive quantization mode Supported values: `-1`, `none`, `caq`.
pa_taq_mode	option_fixed		Sets the temporal adaptive quantization mode Supported values: `-1`, `none`, `1`, `2`.
pa_high_motion_quality_boost_mode	option_fixed		Sets the PA high motion quality boost mode Supported values: `none`, `auto`.
pa_adaptive_mini_gop	bool		Enable Adaptive MiniGOP

H.264 AVC (Cisco OpenH264, SW)

Configuration Parameter: libopenh264

Additional attributes

Name	Type	Default	Description
b	int	5M	Set the bitrate (as a number of bits per second)
maxrate	int		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 Supported values: `constrained_baseline`, `main`, `high`. `constrained_baseline`: constrained_baseline `high`: high
size	string		Resolution of video. Format: WIDTHxHEIGHT
g	int	30	Set the GOP size
slices	int	8	Set the number of slices, used in parallelized encoding. Default value is 8
loopfilter	int	1	Enable loop filter Range: minimum 0.0; maximum 1.0.
max_nal_size	int	0	Set maximum NAL size in bytes Range: minimum 0.0; maximum 2147483647.
allow_skip_frames	option_fixed		Allow skipping frames to hit the target bitrate if set to 1 Supported values: `false`, `true`.
flags	string	+global_header	Set global header in the bitstream
coder	option_fixed	cavlc	Set entropy encoder. Default value is cavlc Supported values: `cavlc`, `cabac`, `default`, `vlc`, `ac`. `default`: default `cabac`: cabac `ac`: ac
rc_mode	option		Select rate control mode (from -1 to 3) (default quality) Supported values: `off`, `quality`, `bitrate`, `buffer`, `timestamp`. `off`: -1: bit rate control off `quality`: 0: quality mode `bitrate`: 1: bitrate mode `buffer`: 2: using buffer status to adjust the video quality (no bitrate control) `timestamp`: 3: bit rate control based on timestamp

H.264 AVC (FFmpeg VPL-MSDK, HW)

Configuration Parameter: h264_qsv

Additional attributes

Name	Type	Default	Description
preset	option_fixed		Change options to trade off compression efficiency against encoding speed Supported values: `veryfast`, `faster`, `fast`, `medium`, `slow`, `slower`, `veryslow`. `veryfast`: veryfast `faster`: faster `fast`: fast `medium`: medium `slow`: slow `slower`: slower `veryslow`: veryslow
forced_idr	bool	false	Forcing I frames as IDR frames
low_power	bool		enable low power mode(experimental: many limitations by mfx version, BRC modes, etc.) (default auto)
rdo	int	-1	Enable rate distortion optimization (from -1 to 1)
max_frame_size	int	-1	Maximum encoded frame size in bytes (from -1 to INT_MAX)
max_frame_size_i	int	-1	Maximum encoded I frame size in bytes (from -1 to INT_MAX)
max_frame_size_p	int	-1	Maximum encoded P frame size in bytes (from -1 to INT_MAX)
max_slice_size	int	-1	Maximum encoded slice size in bytes (from -1 to INT_MAX)
bitrate_limit	int	-1	Toggle bitrate limitations (from -1 to 1)
mbbrc	int	-1	MB level bitrate control (from -1 to 1)
extbrc	int	-1	Extended bitrate control (from -1 to 1)
adaptive_i	int	-1	Adaptive I-frame placement (from -1 to 1)
adaptive_b	int	-1	Adaptive B-frame placement (from -1 to 1)
low_delay_brc	bool		Allow to strictly obey avg frame size (default auto)
max_qp_i	int	-1	Maximum video quantizer scale for I frame (from -1 to 51)
min_qp_i	int	-1	Minimum video quantizer scale for I frame (from -1 to 51)
max_qp_p	int	-1	Maximum video quantizer scale for P frame (from -1 to 51)
min_qp_p	int	-1	Minimum video quantizer scale for P frame (from -1 to 51)
max_qp_b	int	-1	Maximum video quantizer scale for B frame (from -1 to 51)
min_qp_b	int	-1	Minimum video quantizer scale for B frame (from -1 to 51)
scenario	option_fixed	unknown	A hint to encoder about the scenario for the encoding session Supported values: `unknown`, `displayremoting`, `videoconference`, `archive`, `livestreaming`, `cameracapture`, `videosurveillance`, `gamestreaming`, `remotegaming`. `unknown`: unknown `displayremoting`: displayremoting `videoconference`: videoconference `archive`: archive `livestreaming`: livestreaming `cameracapture`: cameracapture `videosurveillance`: videosurveillance `gamestreaming`: gamestreaming `remotegaming`: remotegaming
avbr_accuracy	int	0	Accuracy of the AVBR ratecontrol (unit of tenth of percent) (from 0 to 65535)
avbr_convergence	int	0	Convergence of the AVBR ratecontrol (unit of 100 frames) (from 0 to 65535)
skip_frame	option_fixed	no_skip	Allow frame skipping Supported values: `no_skip`, `insert_dummy`, `insert_nothing`, `brc_only`. `no_skip`: Frame skipping is disabled `insert_dummy`: Encoder inserts into bitstream frame where all macroblocks are encoded as skipped `insert_nothing`: Encoder inserts nothing into bitstream `brc_only`: skip_frame metadata indicates the number of missed frames before the current frame
dual_gfx	option_fixed	off	Prefer processing on both iGfx and dGfx simultaneously Supported values: `off`, `on`, `adaptive`. `off`: Disable HyperEncode mode `on`: Enable HyperEncode mode and return error if incompatible parameters during initialization `adaptive`: Enable HyperEncode mode or fallback to single GPU if incompatible parameters during initialization
cavlc	bool	false	Enable CAVLC
vcm	bool	false	Use the video conferencing mode ratecontrol
idr_interval	int	0	Distance (in I-frames) between IDR frames (from 0 to INT_MAX)
pic_timing_sei	bool	true	Insert picture timing SEI with pic_struct_syntax element
single_sei_nal_unit	int	-1	Put all the SEI messages into one NALU (from -1 to 1)
max_dec_frame_buffering	int	0	Maximum number of frames buffered in the DPB (from 0 to 65535)
look_ahead	bool	false	Use VBR algorithm with look ahead
look_ahead_depth	int	0	Depth of look ahead in number frames (from 0 to 100)
look_ahead_downsampling	option_fixed	unknown	Downscaling factor for the frames saved for the lookahead analysis Supported values: `unknown`, `auto`, `off`, `2x`, `4x`. `unknown`: unknown `auto`: auto `off`: off
int_ref_type	option	-1	Intra refresh type. B frames should be set to 0. (from -1 to 65535) Supported values: `none`, `vertical`, `horizontal`, `slice`. `none`: none `vertical`: vertical `horizontal`: horizontal `slice`: slice
int_ref_cycle_size	int	-1	Number of frames in the intra refresh cycle (from -1 to 65535)
int_ref_qp_delta	int	-32768	QP difference for the refresh MBs (from -32768 to 32767)
recovery_point_sei	int	-1	Insert recovery point SEI messages (from -1 to 1) (default -1)
int_ref_cycle_dist	int	-1	Distance between the beginnings of the intra-refresh cycles in frames (from -1 to 32767)
profile	option	unknown	Used profile (from 0 to INT_MAX) Supported values: `unknown`, `baseline`, `main`, `high`. `unknown`: unknown `baseline`: baseline `main`: main `high`: high
a53cc	bool	true	Use A53 Closed Captions (if available)
aud	bool	false	Insert the Access Unit Delimiter NAL
repeat_pps	bool	false	repeat pps for every frame
async_depth	int		Maximum processing parallelism (from 1 to INT_MAX) (default 4)
qsv_params	string		Set QSV encoder parameters as key1=value1:key2=value2:...
p_strategy	int		Enable P-pyramid: 0-default 1-simple 2-pyramid(bf need to be set to 0). (from 0 to 2) (default 0)
dblk_idc	int		This option disable deblocking. It has value in range 0~2. (from 0 to 2) (default 0)
b_strategy	int		Strategy to choose between I/P/B-frames (from -1 to 1) (default -1)

H.264 AVC (Intel QuickSync, HW)

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	MWriter legacy encoder only: keep frames in GPU memory (D3D11 hardware session). Ignored by the MFCodecs encoder.
quality	int	4	Intel target usage quality: 1 is fastest, 7 is best quality. Supported settings depend on the device and implementation. Range: minimum 1; maximum 7.
g	int	30	This is the IDR period for H264
profile	option_fixed	Auto	Set the profile Supported values: `Auto`, `Baseline`, `Main`, `Extended`, `High`, `Progressive High`.
level	option_fixed	Auto	Native Intel H.264 level. Auto lets Media SDK select the level. The listed numeric levels are passed through without SDK normalization. Supported values: `Auto`, `1.0b`, `1.1`, `1.2`, `1.3`, `2.1`, `2.2`, `3.1`, `3.2`, `4.1`, `4.2`, `5.1`, `5.2`.
rc_type	option_fixed	vbr	The rate control type. vcm and quality_vbr require the MFCodecs encoder; the legacy MWriter Quick Sync encoder falls back to VBR for these two values. Supported values: `cbr`, `vbr`, `cqp`, `avbr`, `vbr_la`, `vbr_la_hrd`, `quality`, `quality_la`, `vcm`, `quality_vbr`.
maxrate	int		The maximum bit rate in bps is the peak bit rate used for VBR rate control
bufsize	int		Rate control buffer size in bytes (Media SDK BufferSizeInKB = value / 1000). 0 lets Media SDK choose.
initialdelay	int	0	Initial VBV delay in bytes (Media SDK InitialDelayInKB = value / 1000). 0 lets Media SDK choose.
bf	int		Number of consecutive B-frames. Media SDK GopRefDist is bf+1; device/profile limits apply. Range: minimum 0.
ref_frames	int	0	Number of reference frames; if NumRefFrame = 0, this parameter is not specified. Range: minimum 0; maximum 16.
cavlc	option_fixed	false	Enable/disable Context-adaptive variable-length coding mode. Supported values: `true`, `false`.
size	string		Resolution of video. Format: WIDTHxHEIGHT.
icq_quality	int		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	Intel implementation selection: -2 automatic, -1 software, 0..3 hardware adapter 1..4 (MFX_IMPL_HARDWARE..HARDWARE4); unavailable adapters fall back to automatic. Range: minimum -2; maximum 3.
use_vpp	bool	false	MWriter legacy encoder only: use Intel VPP for frame conversion and scaling. Ignored by the MFCodecs encoder.
async_depth	int		Number of asynchronous Intel encode tasks. Low-delay mode forces a depth of 1. (from 0 to 65535)
hrd_conformance	option_fixed		Enable Intel HRD conformance (MFCodecs encoder only). This also affects dynamic bitrate reconfiguration. Supported values: `false`, `true`.
low_delay	option_fixed		MFCodecs encoder only: use low-delay encoding; default B-frame count becomes 0 and async depth becomes 1. Ignored by the legacy MWriter H.264 Quick Sync encoder. Supported values: `false`, `true`.
exact_gop	option_fixed		Request strict GOP structure. Supported values: `false`, `true`.
interlace	option		Frame scan structure supplied to Intel Media SDK. Supported values: `auto`, `progressive`, `top`, `bottom`. `auto`: auto `progressive`: progressive `top`: top `bottom`: bottom
BufferSize	string		VBV buffer size in bytes (Media SDK BufferSizeInKB = value / 1000). A positive value takes precedence over bufsize.

H.264 AVC (Intel QuickSync, SW)

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	int	1	Intel target usage quality: 1 is fastest, 7 is best quality. Supported settings depend on the device and implementation. Range: minimum 1; maximum 7.
g	int	30	This is the IDR period for H264
profile	option_fixed	Auto	Set the profile Supported values: `Auto`, `Baseline`, `Main`, `Extended`, `High`, `Progressive High`.
level	option_fixed	Auto	Native Intel H.264 level. Auto lets Media SDK select the level. The listed numeric levels are passed through without SDK normalization. Supported values: `Auto`, `1.0b`, `1.1`, `1.2`, `1.3`, `2.1`, `2.2`, `3.1`, `3.2`, `4.1`, `4.2`, `5.1`, `5.2`.
rc_type	option_fixed	vbr	The rate control type. vcm and quality_vbr require the MFCodecs encoder; the legacy MWriter Quick Sync encoder falls back to VBR for these two values. Supported values: `cbr`, `vbr`, `cqp`, `avbr`, `vbr_la`, `vbr_la_hrd`, `quality`, `quality_la`, `vcm`, `quality_vbr`.
maxrate	int		The maximum bit rate in bps is the peak bit rate used for VBR rate control
bufsize	int	0	Rate control buffer size in bytes (Media SDK BufferSizeInKB = value / 1000). 0 lets Media SDK choose.
initialdelay	int	0	Initial VBV delay in bytes (Media SDK InitialDelayInKB = value / 1000). 0 lets Media SDK choose.
bf	int		Number of consecutive B-frames. Media SDK GopRefDist is bf+1; device/profile limits apply. Range: minimum 0.
ref_frames	int		Number of reference frames; if NumRefFrame = 0, this parameter is not specified. Range: minimum 0; maximum 16.
cavlc	option_fixed	false	Enable/disable Context-adaptive variable-length coding mode. Supported values: `true`, `false`.
size	string		Resolution of video. Format: WIDTHxHEIGHT.
icq_quality	int		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	MWriter legacy encoder only: use Intel VPP for frame conversion and scaling. Ignored by the MFCodecs encoder.
async_depth	int		Number of asynchronous Intel encode tasks. Low-delay mode forces a depth of 1. (from 0 to 65535)
hrd_conformance	option_fixed		Enable Intel HRD conformance (MFCodecs encoder only). This also affects dynamic bitrate reconfiguration. Supported values: `false`, `true`.
low_delay	option_fixed		MFCodecs encoder only: use low-delay encoding; default B-frame count becomes 0 and async depth becomes 1. Ignored by the legacy MWriter H.264 Quick Sync encoder. Supported values: `false`, `true`.
exact_gop	option_fixed		Request strict GOP structure. Supported values: `false`, `true`.
interlace	option		Frame scan structure supplied to Intel Media SDK. Supported values: `auto`, `progressive`, `top`, `bottom`. `auto`: auto `progressive`: progressive `top`: top `bottom`: bottom
force_gpu	int		Intel implementation selection: -2 automatic, -1 software, 0..3 hardware adapter 1..4 (MFX_IMPL_HARDWARE..HARDWARE4); unavailable adapters fall back to automatic. Range: minimum -2; maximum 3.
BufferSize	string		VBV buffer size in bytes (Media SDK BufferSizeInKB = value / 1000). A positive value takes precedence over bufsize.

H.264 AVC (libx264, SW)

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		Use fast settings when encoding first pass Range: minimum 0.0; maximum 1.0.
level	string		Specify level (as defined by Annex A)
wpredp	string		Weighted prediction for P-frames
x264-params	string		Override the x264 configuration using a :-separated list of key=value options. The argument for both options is a list of key=value couples separated by ":". With x264opts the value can be omitted, and the value 1 is assumed in that case Use 8x8dct=1 in this list to enable the high-profile 8x8 transform; this option name cannot be an XML element.
crf	double		Select the quality for constant quality mode Range: minimum -1.0.
crf_max	double		In CRF mode, prevents VBV from lowering quality beyond this point Range: minimum -1.0.
qp	int		Constant quantization parameter rate control method Range: minimum -1.0.
aq-mode	option_fixed		AQ method Supported values: `none`, `variance`, `autovariance`. `variance`: Variance AQ (complexity mask) `autovariance`: Auto-variance AQ (experimental) `size`: Resolution of video. Format: WIDTHxHEIGHT. `ar`: Aspect ratio of video. `ar_type`: Type of video's aspect ratio
aq_mode	option_fixed		Set adaptive quantization mode Supported values: `none`, `variance`, `autovariance`. `variance`: Variance AQ (complexity mask) `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) Supported values: `true`, `false`.
interlace	int	-1	Interlacing: 1 - interlaced, 0 - progressive, -1 - auto Range: minimum -1.0; maximum 1.0.
aq-strength	double	-1.0	AQ strength. Reduces blocking and blurring in flat and textured areas Range: minimum -1.0.
psy	int	-1	Use psychovisual optimizations Range: minimum -1.0; maximum 1.0.
psy-rd	string		Strength of psychovisual optimization, in <psy-rd>:<psy-trellis> format
rc-lookahead	int	-1	Number of frames to look ahead for frametype and ratecontrol Range: minimum -1.0.
weightb	int	-1	Weighted prediction for B-frames. Range: minimum -1.0; maximum 1.0.
weightp	option_fixed		Weighted prediction analysis method Supported values: `none`, `simple`, `smart`.
ssim	int		Calculate and print SSIM stats Range: minimum -1.0; maximum 1.0.
intra-refresh	int	-1	Use Periodic Intra Refresh instead of IDR frames Range: minimum -1.0; maximum 1.0.
b-bias	int		Set the influence on how often B-frames are used
b-pyramid	option_fixed		Set method for keeping of some B-frames as references Supported values: `none`, `strict`, `normal`. `strict`: Strictly hierarchical pyramid `normal`: Non-strict (not Blu-ray compatible)
b_pyramid	option_fixed		Strictly hierarchical pyramidNon-strict (not Blu-ray compatible) Supported values: `none`, `strict`, `normal`.
mixed-refs	int	-1	One reference per partition, as opposed to one reference per macroblock Range: minimum -1.0; maximum 1.0.
fast-pskip	int	-1
aud	int	-1	Use access unit delimiters. Range: minimum -1.0; maximum 1.0.
mbtree	int	-1	Use macroblock tree ratecontrol. Range: minimum -1.0; maximum 1.0.
deblock	string		Loop filter parameters, in <alpha:beta> form.
cplxblur	double	-1.000000	Reduce fluctuations in QP (before curve compression) Range: minimum -1.0.
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 Supported values: `none`, `spatial`, `temporal`, `auto`.
slice-max-size	int	-1	Limit the size of each slice in bytes Range: minimum -1.0.
stats	string		Filename for 2 pass stats
nal-hrd	option_fixed		Signal HRD information (requires vbv-bufsize; cbr not allowed in .mp4) Supported values: `none`, `vbr`, `cbr`.
passlogfile	string		Filename for 2 pass stats. Requires an FFmpeg build with libx264 enabled.
a53cc	option_fixed		Use A53 Closed Captions (if available). Requires an FFmpeg build with libx264 enabled. Supported values: `false`, `true`.
x264opts	string		x264 options. Requires an FFmpeg build with libx264 enabled.
bluray-compat	option_fixed		Bluray compatibility workarounds. Requires an FFmpeg build with libx264 enabled. Supported values: `false`, `true`.
avcintra-class	int		AVC-Intra class 50/100/200/300/480. Requires an FFmpeg build with libx264 enabled.
me_method	option		Set motion estimation method. Requires an FFmpeg build with libx264 enabled. Supported values: `dia`, `hex`, `umh`, `esa`, `tesa`.
motion-est	option		Set motion estimation method. Requires an FFmpeg build with libx264 enabled. Supported values: `dia`, `hex`, `umh`, `esa`, `tesa`.
forced-idr	option_fixed		If forcing keyframes, force them as IDR frames. Requires an FFmpeg build with libx264 enabled. Supported values: `false`, `true`.
coder	option		Coder type. Requires an FFmpeg build with libx264 enabled. Supported values: `default`, `cavlc`, `cabac`, `vlc`, `ac`.
b_strategy	int		Strategy to choose between I/P/B-frames. Requires an FFmpeg build with libx264 enabled.
chromaoffset	int		QP difference between chroma and luma. Requires an FFmpeg build with libx264 enabled.
sc_threshold	int		Scene change threshold. Requires an FFmpeg build with libx264 enabled.
noise_reduction	int		Noise reduction. Requires an FFmpeg build with libx264 enabled.
udu_sei	option_fixed		Use user data unregistered SEI if available. Requires an FFmpeg build with libx264 enabled. Supported values: `false`, `true`.
mb_info	option_fixed		Set mb_info data through AVSideData, only useful when used from the API. Requires an FFmpeg build with libx264 enabled. Supported values: `false`, `true`.

H.264 AVC (NVIDIA NVENC Lossless, HW)

Configuration Parameter: l264

Additional attributes

Name	Type	Default	Description
preset	option_fixed	default	Codec Preset - if specified, some properties below ignored Supported values: `default`, `high_performance`, `high_quality`, `blue_ray_disk`, `low_latency`, `low_latency_hq`, `low_latency_hp`, `lossless`, `lossless_hp`, `p1`, `p2`, `p3`, `p4`, `p5`, `p6`, `p7`.
size	string		Resolution of video. Format: WIDTHxHEIGHT.
ar	option		Aspect ratio of video. Supported values: `16:9`, `4:3`.
ar_type	option_fixed		Type of video's aspect ratio. Supported values: `crop`, `letter-box`, `none`.
disable_sps_pps	option_fixed	false	Disable writing of Sequence and Picture parameter for every IDR frame Supported values: `true`, `false`.
outputBufferingPeriodSEI	option_fixed	true	Set 'true' to write SEI buffering period syntax in the bitstream Supported values: `true`, `false`.
outputPictureTimingSEI	option_fixed	true	Set 'true' to write SEI picture timing syntax in the bitstream Supported values: `true`, `false`.
outputFramePackingSEI	option_fixed	true	Set 'true' to enable writing of frame packing arrangement SEI messages to bitstream Supported values: `true`, `false`.
outputRecoveryPointSEI	option_fixed	true	Set'true' to enable writing of recovery point SEI message Supported values: `true`, `false`.
outputAUD	option_fixed	true	Set 'true' to write Access Unit Delimiter syntax. Supported values: `true`, `false`.
output.444	option_fixed	false	Enable or disable 444 encoding Supported values: `true`, `false`.
udu_sei	option_fixed	false	Set 'true' to write the frame binary data 'sei_user', 'sei_user.1', ... as SEI user data unregistered messages (the first 16 bytes of the data are the UUID) Supported values: `true`, `false`.
adaptiveTransformMode	option_fixed		Enable adaptive transform mode. Requires support from the selected NVENC codec and GPU. Supported values: `false`, `true`.
async_encode	option_fixed		Enable asynchronous NVENC submission. Requires a driver/device mode that supports asynchronous encoding. Supported values: `false`, `true`.
bf	int		Number of consecutive B-frames (frameIntervalP = bf+1), limited by the GPU and GOP length. Range: minimum 0; maximum 2147483647.
deblock	option_fixed		H.264 deblocking filter: 0 disables it, any other value keeps it enabled (default 1). Supported values: `0`, `1`.
disable_cabac	option_fixed		Enable disable_cabac. Requires support from the selected NVENC codec and GPU. Supported values: `false`, `true`.
dynamic_resolution	option_fixed		Reserve encoder dimensions of at least 4096x2160 for resolution changes; availability depends on the device and codec. Supported values: `false`, `true`.
enableConstrainedEncoding	option_fixed		Enable H.264 constrained encoding. Requires support from the selected NVENC codec and GPU. Supported values: `false`, `true`.
enableFillerDataInsertion	option_fixed		Enable filler data insertion. Requires support from the selected NVENC codec and GPU. Supported values: `false`, `true`.
enableTemporalSVC	option_fixed		Enable H.264 temporal SVC. Requires support from the selected NVENC codec and GPU. Supported values: `false`, `true`.
fmoMode	option_fixed		Enable fmo mode. Requires support from the selected NVENC codec and GPU. Supported values: `false`, `true`.
force_gpu	int		NVENC device index. A negative value uses the default device. (from -1 to 2147483647)
g	int		GOP length in frames (SDK default 30). GPU and profile limits apply; intra refresh may replace it with an infinite GOP. Range: minimum 0; maximum 2147483647.
hierarchicalBFrames	option_fixed		Enable hierarchical b frames. Requires support from the selected NVENC codec and GPU. Supported values: `false`, `true`.
hierarchicalPFrames	option_fixed		Enable hierarchical p frames. Requires support from the selected NVENC codec and GPU. Supported values: `false`, `true`.
idrPeriod	int		IDR interval in frames. When omitted, the SDK uses the GOP length; periodic intra refresh can override it. (from 0 to 2147483647)
intraRefreshCount	int		Number of frames over which to spread an intra refresh cycle; limited by intraRefreshPeriod. Range: minimum 0; maximum 2147483647.
intraRefreshPeriod	int		Interval between intra refresh cycles, in frames. A positive value enables intra refresh and an infinite GOP.
level	string		Codec level written to the bitstream, for example 4.1. Omit the property for automatic selection.
ltrNumFrames	int		Number of long-term reference frames, limited by the codec and GPU capabilities. Range: minimum 0; maximum 2147483647.
ltrTrustMode	option_fixed		Enable ltr trust mode. Requires support from the selected NVENC codec and GPU. Supported values: `false`, `true`.
maxNumRefFrames	int		Maximum H.264 reference frames supported by the selected profile and GPU. (from 0 to 2147483647)
mvprecision	option		Motion-vector precision; the selected codec/GPU must support it. Supported values: `Auto`, `Full`, `Half`, `Quarter`. `Auto`: Auto `Full`: Full `Half`: Half `Quarter`: Quarter
numTemporalLayers	int		Maximum number of H.264 temporal layers, limited by the selected profile and GPU capabilities. Range: minimum 0; maximum 2147483647.
output.10bit	option_fixed		Output bit depth: auto follows the input frame, true requests 10-bit, false requests 8-bit. Requires support for the selected codec on the GPU. Supported values: `auto`, `false`, `true`.
output.422	option_fixed		Request 4:2:2 chroma output. Requires GPU/codec support; output.444 takes precedence. AV1 currently supports 4:2:0 only. Supported values: `false`, `true`.
profile	option		NVENC H.264 profile. Availability depends on GPU and lossless/profile compatibility. Supported values: `Auto`, `Baseline`, `Main`, `High`, `Stereo`, `444`. `Auto`: Auto `Baseline`: Baseline `Main`: Main `High`: High `Stereo`: Stereo
separateColourPlaneFlag	option_fixed		Enable separate colour plane flag. Requires support from the selected NVENC codec and GPU. Supported values: `false`, `true`.
sliceMode	option		Slice partitioning: default, macroblocks, bytes, macroblock rows, or number of slices. AV1 uses tiles. NVIDIA SDK 13.0 limits slicing to a single slice. Supported values: `default`, `mb`, `bytes`, `mb_rows`, `slice_number`. `mb_rows`: mb_rows `slice_number`: slice_number
sliceModeData	int		Slice partition size/count interpreted according to sliceMode. NVIDIA SDK 13.0 limits this to a single slice. (from 0 to 2147483647)
useBFramesAsRef	option		B-frame reference mode: 0 disables B references, 1 allows each B-frame, 2 uses a middle B-frame. Requires codec/GPU support. (from 0 to 2) Supported values: `0`, `1`, `2`.

H.264 AVC (NVIDIA NVENC, HW)

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	30	This is the IDR period
bf	int		This sets the distance of one P picture from the previous P picture. e.g. for IBBPBBP, set the value as 3 Range: minimum 1; maximum 17.
rc_type	option_fixed	Auto	The rate control type Supported values: `Auto`, `cbr`, `vbr`, `cqp`.
preset	option_fixed	default	Codec Preset - if specified, some properties below ignored Supported values: `default`, `high_performance`, `high_quality`, `blue_ray_disk`, `low_latency`, `low_latency_hq`, `low_latency_hp`, `lossless`, `lossless_hp`, `p1`, `p2`, `p3`, `p4`, `p5`, `p6`, `p7`.
tuning_info	option_fixed	high_quality	Codec Tuning Info - if specified, some properties below ignored Supported values: `high_quality`, `low_latency`, `ultra_low_latency`.
profile	option_fixed	Auto	Codec Profile Supported values: `Auto`, `Baseline`, `Main`, `High`, `Stereo`, `444`.
level	option_fixed	Auto	Sets the level flag in the output bitstream Supported values: `Auto`, `1.0`, `1.0b`, `1.1`, `1.2`, `1.3`, `2.0`, `2.1`, `2.2`, `3.0`, `3.1`, `3.2`, `4.0`, `4.1`, `4.2`, `5.0`, `5.1`, `5.2`, `6.0`, `6.1`, `6.2`.
maxrate	int		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 Supported values: `16:9`, `4:3`.
ar_type	option_fixed		Type of video's aspect ratio. Supported values: `crop`, `letter-box`, `none`.
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		Set this to TRUE to enable adaptive quantization Supported values: `true`, `false`.
intraRefreshPeriod	int		Specifies the interval between successive intra refresh if intraRefreshCount is set
intraRefreshCount	int		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 Supported values: `true`, `false`.
mvprecision	option_fixed	Auto	Specifies the desired motion vector prediction precision Supported values: `Auto`, `Full`, `Half`, `Quarter`.
disable_sps_pps	option_fixed	false	Disable writing of Sequence and Picture parameter for every IDR frame Supported values: `true`, `false`.
separateColourPlaneFlag	option_fixed	false	Set 'true' to enable 4:4:4 separate colour planes Supported values: `true`, `false`.
deblock	option_fixed	1	Specifies the deblocking filter mode Supported values: `0`, `1`, `2`.
enableTemporalSVC	option_fixed	false	Set to 'true' to enable SVC temporal Supported values: `true`, `false`.
hierarchicalPFrames	option_fixed	false	Set to 'true' to enable hierarchical PFrames Supported values: `true`, `false`.
hierarchicalBFrames	option_fixed	false	Set to 'true' to enable hierarchical BFrames Supported values: `true`, `false`.
outputBufferingPeriodSEI	option_fixed	true	Set 'true' to write SEI buffering period syntax in the bitstream Supported values: `true`, `false`.
outputPictureTimingSEI	option_fixed	true	Set 'true' to write SEI picture timing syntax in the bitstream Supported values: `true`, `false`.
outputFramePackingSEI	option_fixed	true	Set 'true' to enable writing of frame packing arrangement SEI messages to bitstream Supported values: `true`, `false`.
outputRecoveryPointSEI	option_fixed	true	Set'true' to enable writing of recovery point SEI message Supported values: `true`, `false`.
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 Supported values: `true`, `false`.
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 Supported values: `true`, `false`.
enableConstrainedEncoding	option_fixed		Set this to 1 to enable constrainedFrame encoding where each slice in the constarined picture is independent of other slices Supported values: `true`, `false`.
adaptiveTransformMode	option_fixed		Enable the AdaptiveTransform Mode. Supported values: `true`, `false`.
fmoMode	option_fixed		Enable the FMO Mode. Supported values: `true`, `false`.
interlace	option_fixed	Auto	Interlace type Supported values: `Auto`, `Top`, `Bottom`, `Progressive`.
output.444	option_fixed	false	Enable or disable 444 encoding Supported values: `true`, `false`.
qpi	int	25	Determines I-frame quality in CQP mode
qpp	int	28	Determines P-frame quality in CQP mode
qpb	int	31	Determines B-frame quality in CQP mode
targetQuality	int	0	Set target quality level (0 to 51, 0 means automatic) for constant quality mode in VBR rate control (default 0)
lowDelayKeyFrameScale	int	0	Specifies the Scene Change frame size increase allowed in case of single frame VBV and CBR (from 0 to 255, default 0)
enableFillerDataInsertion	int	0	Set to 1 in case the bitrate needs to be strictly adhered to (default 0)
udu_sei	option_fixed	false	Set 'true' to write the frame binary data 'sei_user', 'sei_user.1', ... as SEI user data unregistered messages (the first 16 bytes of the data are the UUID) Supported values: `true`, `false`.
async_encode	option_fixed		Enable asynchronous NVENC submission. Requires a driver/device mode that supports asynchronous encoding. Supported values: `false`, `true`.
bufsize.msec	int		VBV duration in milliseconds. A positive value derives the VBV size from average bitrate and takes precedence over bufsize/vbvBufferSize. (from 0 to 2147483647)
dynamic_resolution	option_fixed		Reserve encoder dimensions of at least 4096x2160 for resolution changes; availability depends on the device and codec. Supported values: `false`, `true`.
enableInitialRCQP	option_fixed		Enable initial QP values from initialQPI, initialQPP and initialQPB. Supported values: `false`, `true`.
enableMaxQP	option_fixed		Enable maximum QP limits from maxQPI, maxQPP and maxQPB. Supported values: `false`, `true`.
enableMinQP	option_fixed		Enable minimum QP limits from minQPI, minQPP and minQPB. Supported values: `false`, `true`.
force_gpu	int		NVENC device index. A negative value uses the default device. (from -1 to 2147483647)
idrPeriod	int		IDR interval in frames. When omitted, the SDK uses the GOP length; periodic intra refresh can override it. (from 0 to 2147483647)
initialQPB	int		Initial QP for B frames. Used when enableInitialRCQP is enabled; the valid QP range depends on codec/bit depth. (from 0 to 255)
initialQPI	int		Initial QP for I frames. Used when enableInitialRCQP is enabled; the valid QP range depends on codec/bit depth. (from 0 to 255)
initialQPP	int		Initial QP for P frames. Used when enableInitialRCQP is enabled; the valid QP range depends on codec/bit depth. (from 0 to 255)
maxQPB	int		Maximum QP for B frames. Used when enableMaxQP is enabled; the valid QP range depends on codec/bit depth. (from 0 to 255)
maxQPI	int		Maximum QP for I frames. Used when enableMaxQP is enabled; the valid QP range depends on codec/bit depth. (from 0 to 255)
maxQPP	int		Maximum QP for P frames. Used when enableMaxQP is enabled; the valid QP range depends on codec/bit depth. (from 0 to 255)
minQPB	int		Minimum QP for B frames. Used when enableMinQP is enabled; the valid QP range depends on codec/bit depth. (from 0 to 255)
minQPI	int		Minimum QP for I frames. Used when enableMinQP is enabled; the valid QP range depends on codec/bit depth. (from 0 to 255)
minQPP	int		Minimum QP for P frames. Used when enableMinQP is enabled; the valid QP range depends on codec/bit depth. (from 0 to 255)
output.10bit	option_fixed		Output bit depth: auto follows the input frame, true requests 10-bit, false requests 8-bit. Requires support for the selected codec on the GPU. Supported values: `auto`, `false`, `true`.
output.422	option_fixed		Request 4:2:2 chroma output. Requires GPU/codec support; output.444 takes precedence. AV1 currently supports 4:2:0 only. Supported values: `false`, `true`.
sliceMode	option		Slice partitioning: default, macroblocks, bytes, macroblock rows, or number of slices. AV1 uses tiles. NVIDIA SDK 13.0 limits slicing to a single slice. Supported values: `default`, `mb`, `bytes`, `mb_rows`, `slice_number`. `mb_rows`: mb_rows `slice_number`: slice_number
sliceModeData	int		Slice partition size/count interpreted according to sliceMode. NVIDIA SDK 13.0 limits this to a single slice. (from 0 to 2147483647)
useBFramesAsRef	option		B-frame reference mode: 0 disables B references, 1 allows each B-frame, 2 uses a middle B-frame. Requires codec/GPU support. (from 0 to 2) Supported values: `0`, `1`, `2`.
vbvBufferSize	string		VBV buffer size in bits. Takes precedence over bufsize; a positive bufsize.msec overrides both.
vbvInitialDelay	string		Initial VBV occupancy in bits. Takes precedence over initialdelay.

H.265 HEVC (AMD AMF, HW)

Configuration Parameter: a265

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
minrate	int		Set min bitrate tolerance (in bits/s). Most useful in setting up a CBR encode. It is of little use elsewise
bitdepth	option_fixed		Set color bit deph (8/10) Supported values: `8`, `10`.
profile	option_fixed		Set the profile Supported values: `main`, `main10`.
profile_tier	option_fixed		Set the profile tier Supported values: `main`, `high`.
level	option_fixed	auto	Set the encoding level Supported values: `auto`, `1.0`, `2.0`, `2.1`, `3.0`, `3.1`, `4.0`, `4.1`, `5.0`, `5.1`, `5.2`, `6.0`, `6.1`, `6.2`.
quality	option_fixed	balanced	Set the encoding quality preset (FFmpeg alias: preset). Supported values: `balanced`, `speed`, `quality`, `high_quality`.
latency	bool		Enables low latency mode
rc	option_fixed	qvbr	Set the rate control mode Supported values: `cqp`, `cbr`, `vbr_peak`, `vbr_latency`, `qvbr`, `hqvbr`, `hqcbr`.
qvbr_quality_level	int	-1	Sets the QVBR quality level (from -1 to 51)
header_insertion_mode	option_fixed		Set header insertion mode Supported values: `none`, `gop`, `idr`.
async_depth	int	16	Set maximum encoding parallelism. Higher values increase output latency. (from 1 to 16) (default 16)
high_motion_quality_boost_enable	bool		Enable High motion quality boost mode
gops_per_idr	int	1	GOPs per IDR 0-no IDR will be inserted (from 0 to 2147483647) (default 1)
preencode	bool		Enable preencode
vbaq	bool		Enable VBAQ
enforce_hrd	bool		Enforce HRD
filler_data	bool		Filler Data Enable
max_au_size	int	-1	Maximum Access Unit Size for rate control (in bits) (from -1 to 2147483647)
min_qp_i	int	-1	min quantization parameter for I-frame (from -1 to 51) (default -1)
max_qp_i	int	-1	max quantization parameter for I-frame (from -1 to 51) (default -1)
min_qp_p	int	-1	min quantization parameter for P-frame (from -1 to 51) (default -1)
max_qp_p	int	-1	max quantization parameter for P-frame (from -1 to 51) (default -1)
qp_p	int	-1	quantization parameter for P-frame (from -1 to 51) (default -1)
qp_i	int	-1	quantization parameter for I-frame (from -1 to 51) (default -1)
skip_frame	bool		Rate Control Based Frame Skip
me_half_pel	bool		Enable ME Half Pixel
me_quarter_pel	bool		Enable ME Quarter Pixel
forced_idr	bool		Force I frames to be IDR frames
aud	bool		Inserts AU Delimiter NAL unit
smart_access_video	bool		Enable Smart Access Video to enhance performance by utilizing both APU and dGPU memory access
preanalysis	bool		Enable preanalysis
pa_activity_type	option_fixed		Set the type of activity analysis Supported values: `-1`, `y`, `yuv`.
pa_scene_change_detection_enable	bool		Enable scene change detection
pa_scene_change_detection_sensitivity	option_fixed		Set the sensitivity of scene change detection Supported values: `-1`, `low`, `medium`, `high`.
pa_static_scene_detection_enable	bool		Enable static scene detection
pa_static_scene_detection_sensitivity	option_fixed		Set the sensitivity of static scene detection Supported values: `-1`, `low`, `medium`, `high`.
pa_initial_qp_after_scene_change	int	-1	The QP value that is used immediately after a scene change (from -1 to 51)
pa_max_qp_before_force_skip	int	-1	The QP threshold to allow a skip frame (from -1 to 51)
pa_caq_strength	option_fixed		Content Adaptive Quantization strength Supported values: `-1`, `low`, `medium`, `high`.
pa_frame_sad_enable	bool		Enable Frame SAD algorithm
pa_ltr_enable	bool		Enable long term reference frame management
pa_lookahead_buffer_depth	int	-1	Sets the PA lookahead buffer size (from -1 to 41)
pa_paq_mode	option_fixed		Sets the perceptual adaptive quantization mode Supported values: `-1`, `none`, `caq`.
pa_taq_mode	option_fixed		Sets the temporal adaptive quantization mode Supported values: `-1`, `none`, `1`, `2`.
pa_high_motion_quality_boost_mode	option_fixed		Sets the PA high motion quality boost mode Supported values: `none`, `auto`.

H.265 HEVC (FFmpeg VPL-MSDK, HW)

Configuration Parameter: hevc_qsv

Additional attributes

Name	Type	Default	Description
async_depth	int	4	Maximum processing parallelism (from 1 to INT_MAX)
preset	option_fixed		Change options to trade off compression efficiency against encoding speed Supported values: `veryfast`, `faster`, `fast`, `medium`, `slow`, `slower`, `veryslow`. `veryfast`: veryfast `faster`: faster `fast`: fast `medium`: medium `slow`: slow `slower`: slower `veryslow`: veryslow
forced_idr	bool	false	Forcing I frames as IDR frames
low_power	bool		enable low power mode(experimental: many limitations by mfx version, BRC modes, etc.) (default auto)
rdo	int	-1	Enable rate distortion optimization (from -1 to 1)
max_frame_size	int	-1	Maximum encoded frame size in bytes (from -1 to INT_MAX)
max_frame_size_i	int	-1	Maximum encoded I frame size in bytes (from -1 to INT_MAX)
max_frame_size_p	int	-1	Maximum encoded P frame size in bytes (from -1 to INT_MAX)
max_slice_size	int	-1	Maximum encoded slice size in bytes (from -1 to INT_MAX)
mbbrc	int	-1	MB level bitrate control (from -1 to 1)
extbrc	int	-1	Extended bitrate control (from -1 to 1)
p_strategy	int	0	Enable P-pyramid: 0-default 1-simple 2-pyramid(bf need to be set to 0). (from 0 to 2)
b_strategy	int	-1	Strategy to choose between I/P/B-frames (from -1 to 1)
low_delay_brc	bool		Allow to strictly obey avg frame size (default auto)
max_qp_i	int	-1	Maximum video quantizer scale for I frame (from -1 to 51)
min_qp_i	int	-1	Minimum video quantizer scale for I frame (from -1 to 51)
max_qp_p	int	-1	Maximum video quantizer scale for P frame (from -1 to 51)
min_qp_p	int	-1	Minimum video quantizer scale for P frame (from -1 to 51)
max_qp_b	int	-1	Maximum video quantizer scale for B frame (from -1 to 51)
min_qp_b	int	-1	Minimum video quantizer scale for B frame (from -1 to 51)
adaptive_i	int	-1	Adaptive I-frame placement (from -1 to 1)
adaptive_b	int	-1	Adaptive B-frame placement (from -1 to 1)
scenario	option_fixed	unknown	A hint to encoder about the scenario for the encoding session Supported values: `unknown`, `displayremoting`, `videoconference`, `archive`, `livestreaming`, `cameracapture`, `videosurveillance`, `gamestreaming`, `remotegaming`. `unknown`: unknown `displayremoting`: displayremoting `videoconference`: videoconference `archive`: archive `livestreaming`: livestreaming `cameracapture`: cameracapture `videosurveillance`: videosurveillance `gamestreaming`: gamestreaming `remotegaming`: remotegaming
avbr_accuracy	int	0	Accuracy of the AVBR ratecontrol (unit of tenth of percent) (from 0 to 65535)
avbr_convergence	int	0	Convergence of the AVBR ratecontrol (unit of 100 frames) (from 0 to 65535)
skip_frame	option_fixed	no_skip	Allow frame skipping Supported values: `no_skip`, `insert_dummy`, `insert_nothing`, `brc_only`. `no_skip`: Frame skipping is disabled `insert_dummy`: Encoder inserts into bitstream frame where all macroblocks are encoded as skipped `insert_nothing`: Encoder inserts nothing into bitstream `brc_only`: skip_frame metadata indicates the number of missed frames before the current frame
dual_gfx	option_fixed	off	Prefer processing on both iGfx and dGfx simultaneously Supported values: `off`, `on`, `adaptive`. `off`: Disable HyperEncode mode `on`: Enable HyperEncode mode and return error if incompatible parameters during initialization `adaptive`: Enable HyperEncode mode or fallback to single GPU if incompatible parameters during initialization
idr_interval	option	0	Distance (in I-frames) between IDR frames (from -1 to INT_MAX) Supported values: `begin_only`. `begin_only`: Output an IDR-frame only at the beginning of the stream
load_plugins	option_fixed	hevc_hw	A user plugin to load in an internal session (from 0 to 2) Supported values: `none`, `hevc_sw`, `hevc_hw`.
look_ahead_depth	int	0	Depth of look ahead in number frames (from 0 to 100)
profile	option	unknown	Used profile (from 0 to INT_MAX) Supported values: `unknown`, `main`, `main10`, `mainsp`, `rext`, `scc`. `unknown`: unknown `main`: main `main10`: main10 `mainsp`: mainsp `rext`: rext `scc`: scc
tier	option	high	Set the encoding tier (only level >= 4 can support high tier) (from 0 to 256) Supported values: `main`, `high`. `main`: main
gpb	bool	true	1: GPB (generalized P/B frame); 0: regular P frame
tile_cols	int	0	Number of columns for tiled encoding (from 0 to 65535)
tile_rows	int	0	Number of rows for tiled encoding (from 0 to 65535)
recovery_point_sei	int	-1	Insert recovery point SEI messages (from -1 to 1)
aud	bool	false	Insert the Access Unit Delimiter NAL
pic_timing_sei	bool	true	Insert picture timing SEI with pic_struct_syntax element
transform_skip	int	-1	Turn this option ON to enable transformskip (from -1 to 1)
int_ref_type	option	-1	Intra refresh type. B frames should be set to 0. (from -1 to 65535) Supported values: `none`, `vertical`, `horizontal`, `slice`. `none`: none `vertical`: vertical `horizontal`: horizontal `slice`: slice
int_ref_cycle_size	int	-1	Number of frames in the intra refresh cycle (from -1 to 65535)
int_ref_qp_delta	int	-32768	QP difference for the refresh MBs (from -32768 to 32767) (default -32768)
int_ref_cycle_dist	int	-1	Distance between the beginnings of the intra-refresh cycles in frames (from -1 to 32767)
qsv_params	string		Set QSV encoder parameters as key1=value1:key2=value2:...
dblk_idc	int		This option disable deblocking. It has value in range 0~2. (from 0 to 2) (default 0)
load_plugin	option		A user plugin to load in an internal session (from 0 to 2) (default hevc_hw) Supported values: `none`, `hevc_sw`, `hevc_hw`. `none`: 0: none `hevc_sw`: 1: hevc_sw `hevc_hw`: 2: hevc_hw

H.265 HEVC (Intel QuickSync, HW)

Configuration Parameter: q265hw

Additional attributes

Name	Type	Default	Description
rc_type	option_fixed	vbr	The rate control type Supported values: `cbr`, `vbr`, `cqp`, `avbr`, `vbr_la`, `vbr_la_hrd`, `quality`, `quality_la`, `vcm`, `quality_vbr`.
bf	int		Number of consecutive B-frames. Media SDK GopRefDist is bf+1; device/profile limits apply. Range: minimum 0.
async_depth	int	4	Maximum processing parallelism Range: minimum 0.0.
profile	option_fixed	Auto	Native Intel HEVC profile. Auto lets Media SDK select the profile. Supported values: `Auto`, `Main`, `Main10`.
b	int	5M	The average bit rate in bps is the target bit rate used for VBR rate control
quality	int		Intel target usage quality: 1 is fastest, 7 is best quality. Supported settings depend on the device and implementation. Range: minimum 1; maximum 7.
g	int		GOP size (distance between I-frames). For HEVC only the first frame is IDR (IdrInterval=0). SDK default 15.
maxrate	int		The maximum bit rate in bps is the peak bit rate used for VBR rate control
bufsize	int		Rate control buffer size in bytes (Media SDK BufferSizeInKB = value / 1000). 0 lets Media SDK choose.
initialdelay	int		Initial VBV delay in bytes (Media SDK InitialDelayInKB = value / 1000). 0 lets Media SDK choose.
ref_frames	int		Number of reference frames; if NumRefFrame = 0, this parameter is not specified. Range: minimum 0; maximum 16.
size	string		Resolution of video. Format: WIDTHxHEIGHT.
icq_quality	int		Quality of intelligent constant quality algorithm. Possible values: from 1 (the best quality) to 51.
accuracy	int		Determines quality of complex scenes in AVBR mode.
convergence	int		Determines quality of complex scenes in AVBR mode.
qpi	int		Determines quality in CQP mode.
qpb	int		Determines quality in CQP mode.
qpp	int		Determines quality in CQP mode.
hrd_conformance	option_fixed		Enable Intel HRD conformance (MFCodecs encoder only). This also affects dynamic bitrate reconfiguration. Supported values: `false`, `true`.
low_delay	option_fixed		Use low-delay encoding: default B-frame count becomes 0 and async depth becomes 1. Supported values: `false`, `true`.
exact_gop	option_fixed		Request strict GOP structure. Supported values: `false`, `true`.
interlace	option		Frame scan structure supplied to Intel Media SDK. Supported values: `auto`, `progressive`, `top`, `bottom`. `auto`: auto `progressive`: progressive `top`: top `bottom`: bottom
force_gpu	int		Intel implementation selection: -2 automatic, -1 software, 0..3 hardware adapter 1..4 (MFX_IMPL_HARDWARE..HARDWARE4); unavailable adapters fall back to automatic. Range: minimum -2; maximum 3.
BufferSize	string		VBV buffer size in bytes (Media SDK BufferSizeInKB = value / 1000). A positive value takes precedence over bufsize.
level	option_fixed		Native Intel HEVC level. Auto lets Media SDK choose. The listed numeric levels are passed through without SDK normalization. Supported values: `Auto`, `2.1`, `3.1`, `4.1`, `5.1`, `5.2`, `6.1`, `6.2`.

H.265 HEVC (NVIDIA NVENC Lossless, HW)

Configuration Parameter: l265

Additional attributes

Name	Type	Default	Description
preset	option_fixed	default	Codec Preset - if specified, some properties below ignored Supported values: `default`, `high_performance`, `high_quality`, `blue_ray_disk`, `low_latency`, `low_latency_hq`, `low_latency_hp`, `lossless`, `lossless_hp`, `p1`, `p2`, `p3`, `p4`, `p5`, `p6`, `p7`.
size	string		Resolution of video. Format: WIDTHxHEIGHT.
ar	option		Aspect ratio of video Supported values: `16:9`, `4:3`.
ar_type	option_fixed		Type of video's aspect ratio. Supported values: `crop`, `letter-box`, `none`.
disable_sps_pps	option_fixed	false	Disable writing of Sequence and Picture parameter for every IDR frame Supported values: `true`, `false`.
outputBufferingPeriodSEI	option_fixed	true	Set 'true' to write SEI buffering period syntax in the bitstream Supported values: `true`, `false`.
outputPictureTimingSEI	option_fixed	true	Set 'true' to write SEI picture timing syntax in the bitstream Supported values: `true`, `false`.
outputAUD	option_fixed	true	Set 'true' to write Access Unit Delimiter syntax Supported values: `true`, `false`.
output.10bit	option_fixed	false	Output bit depth: auto follows the input frame, true requests 10-bit, false requests 8-bit. Requires support for the selected codec on the GPU. Supported values: `auto`, `false`, `true`.
output.444	option_fixed	false	Enable or disable 444 encoding Supported values: `true`, `false`.
udu_sei	option_fixed	false	Set 'true' to write the frame binary data 'sei_user', 'sei_user.1', ... as SEI user data unregistered messages (the first 16 bytes of the data are the UUID) Supported values: `true`, `false`.
async_encode	option_fixed		Enable asynchronous NVENC submission. Requires a driver/device mode that supports asynchronous encoding. Supported values: `false`, `true`.
bf	int		Number of consecutive B-frames (frameIntervalP = bf+1), limited by the GPU and GOP length. Range: minimum 0; maximum 2147483647.
deblock	option_fixed		HEVC deblocking across slice boundaries: 0 disables it, 1 enables it (default 1). Supported values: `0`, `1`.
dynamic_resolution	option_fixed		Reserve encoder dimensions of at least 4096x2160 for resolution changes; availability depends on the device and codec. Supported values: `false`, `true`.
enableFillerDataInsertion	option_fixed		Enable filler data insertion. Requires support from the selected NVENC codec and GPU. Supported values: `false`, `true`.
enableLTR	option_fixed		Enable long-term reference frames when supported. HEVC 4:2:2/4:4:4 with B-frames disables LTR. Supported values: `false`, `true`.
force_gpu	int		NVENC device index. A negative value uses the default device. (from -1 to 2147483647)
g	int		GOP length in frames (SDK default 30). GPU and profile limits apply. Range: minimum 0; maximum 2147483647.
idrPeriod	int		IDR interval in frames. When omitted, the SDK uses the GOP length; HEVC intra refresh does not change this interval. Range: minimum 0; maximum 2147483647.
intraRefreshCount	int		Number of frames over which to spread an intra refresh cycle; limited by intraRefreshPeriod. Range: minimum 0; maximum 2147483647.
intraRefreshPeriod	int		Interval between intra refresh cycles, in frames. A positive value enables intra refresh; for HEVC the GOP length and IDR period stay as set.
level	string		Codec level written to the bitstream, for example 4.1. Omit the property for automatic selection.
ltrNumFrames	int		Number of long-term reference frames, limited by the codec and GPU capabilities. Range: minimum 0; maximum 2147483647.
maxNumRefFramesInDPB	int		Maximum decoded-picture-buffer reference frames; supported values depend on the codec and GPU. (from 0 to 2147483647)
maxTemporalLayersMinus1	int		Maximum number of HEVC temporal layers minus one, limited by the selected profile and GPU capabilities. Range: minimum 0; maximum 2147483647.
mvprecision	option		Motion-vector precision; the selected codec/GPU must support it. Supported values: `Auto`, `Full`, `Half`, `Quarter`. `Auto`: Auto `Full`: Full `Half`: Half `Quarter`: Quarter
output.422	option_fixed		Request 4:2:2 chroma output. Requires GPU/codec support; output.444 takes precedence. AV1 currently supports 4:2:0 only. Supported values: `false`, `true`.
sliceMode	option		Slice partitioning: default, macroblocks, bytes, macroblock rows, or number of slices. AV1 uses tiles. NVIDIA SDK 13.0 limits slicing to a single slice. Supported values: `default`, `mb`, `bytes`, `mb_rows`, `slice_number`. `mb_rows`: mb_rows `slice_number`: slice_number
sliceModeData	int		Slice partition size/count interpreted according to sliceMode. NVIDIA SDK 13.0 limits this to a single slice. (from 0 to 2147483647)
tier	option		HEVC/AV1 bitstream tier. Supported values: `main`, `high`. `main`: main `high`: high
useBFramesAsRef	option		B-frame reference mode: 0 disables B references, 1 allows each B-frame, 2 uses a middle B-frame. Requires codec/GPU support. (from 0 to 2) Supported values: `0`, `1`, `2`.
useConstrainedIntraPred	option_fixed		Enable use constrained intra pred. Requires support from the selected NVENC codec and GPU. Supported values: `false`, `true`.

H.265 HEVC (NVIDIA NVENC, HW)

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	30	This is the IDR period
bf	int		This sets the distance of one P picture from the previous P picture. e.g. for IBBPBBP, set the value as 3 Range: minimum 1; maximum 17.
rc_type	option_fixed	Auto	The rate control type Supported values: `Auto`, `cbr`, `vbr`, `cqp`.
preset	option_fixed	default	Codec Preset - if specified, some properties below ignored Supported values: `default`, `high_performance`, `high_quality`, `blue_ray_disk`, `low_latency`, `low_latency_hq`, `low_latency_hp`, `lossless`, `lossless_hp`, `p1`, `p2`, `p3`, `p4`, `p5`, `p6`, `p7`.
tuning_info	option_fixed	high_quality	Codec Tuning Info - if specified, some properties below ignored Supported values: `high_quality`, `low_latency`, `ultra_low_latency`.
level	option_fixed	Auto	Specifies the level of the encoded bitstream. Supported values: `Auto`, `1.0`, `2.0`, `2.1`, `3.0`, `3.1`, `4.0`, `4.1`, `5.0`, `5.1`, `5.2`, `5.0`, `5.1`, `5.2`, `6.0. 6.1`, `6.2`.
tier	option_fixed	Main	Supported values: `Main`, `High`.
maxrate	int		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. Supported values: `16:9`, `4:3`.
ar_type	option_fixed		Type of video's aspect ratio. Supported values: `crop`, `letter-box`, `none`.
bufsize	int		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 Supported values: `true`, `false`.
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 Supported values: `Auto`, `Full`, `Half`, `Quarter`.
disable_sps_pps	option_fixed	false	Disable writing of Sequence and Picture parameter for every IDR frame Supported values: `true`, `false`.
deblock	option_fixed	true	Set 'true' to enable in loop filtering across slice boundary. Supported values: `true`, `false`.
useConstrainedIntraPred	option_fixed		Set 'true' to enable constrained intra prediction. Supported values: `true`, `false`.
outputBufferingPeriodSEI	option_fixed	true	Set 'true' to write SEI buffering period syntax in the bitstream Supported values: `true`, `false`.
outputPictureTimingSEI	option_fixed	true	Set 'true' to write SEI picture timing syntax in the bitstream Supported values: `true`, `false`.
outputAUD	option_fixed	true	Set 'true' to write Access Unit Delimiter syntax Supported values: `true`, `false`.
enableLTR	option_fixed		Set 'true' to enable use of long term reference pictures for inter prediction Supported values: `true`, `false`.
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	Output bit depth: auto follows the input frame, true requests 10-bit, false requests 8-bit. Requires support for the selected codec on the GPU. Supported values: `auto`, `false`, `true`.
output.444	option_fixed	false	Enable or disable 444 encoding Supported values: `true`, `false`.
qpi	int	25	Determines I-frame quality in CQP mode
qpp	int	28	Determines P-frame quality in CQP mode
qpb	int	31	Determines B-frame quality in CQP mode
targetQuality	int	0	Set target quality level (0 to 51, 0 means automatic) for constant quality mode in VBR rate control (default 0)
lowDelayKeyFrameScale	int	0	Specifies the Scene Change frame size increase allowed in case of single frame VBV and CBR (from 0 to 255, default 0)
enableFillerDataInsertion	int	0	Set to 1 in case the bitrate needs to be strictly adhered to (default 0)
udu_sei	option_fixed	false	Set 'true' to write the frame binary data 'sei_user', 'sei_user.1', ... as SEI user data unregistered messages (the first 16 bytes of the data are the UUID) Supported values: `true`, `false`.
async_encode	option_fixed		Enable asynchronous NVENC submission. Requires a driver/device mode that supports asynchronous encoding. Supported values: `false`, `true`.
bufsize.msec	int		VBV duration in milliseconds. A positive value derives the VBV size from average bitrate and takes precedence over bufsize/vbvBufferSize. (from 0 to 2147483647)
dynamic_resolution	option_fixed		Reserve encoder dimensions of at least 4096x2160 for resolution changes; availability depends on the device and codec. Supported values: `false`, `true`.
enableInitialRCQP	option_fixed		Enable initial QP values from initialQPI, initialQPP and initialQPB. Supported values: `false`, `true`.
enableMaxQP	option_fixed		Enable maximum QP limits from maxQPI, maxQPP and maxQPB. Supported values: `false`, `true`.
enableMinQP	option_fixed		Enable minimum QP limits from minQPI, minQPP and minQPB. Supported values: `false`, `true`.
force_gpu	int		NVENC device index. A negative value uses the default device. (from -1 to 2147483647)
idrPeriod	int		IDR interval in frames. When omitted, the SDK uses the GOP length; HEVC intra refresh does not change this interval. Range: minimum 0; maximum 2147483647.
initialQPB	int		Initial QP for B frames. Used when enableInitialRCQP is enabled; the valid QP range depends on codec/bit depth. (from 0 to 255)
initialQPI	int		Initial QP for I frames. Used when enableInitialRCQP is enabled; the valid QP range depends on codec/bit depth. (from 0 to 255)
initialQPP	int		Initial QP for P frames. Used when enableInitialRCQP is enabled; the valid QP range depends on codec/bit depth. (from 0 to 255)
maxQPB	int		Maximum QP for B frames. Used when enableMaxQP is enabled; the valid QP range depends on codec/bit depth. (from 0 to 255)
maxQPI	int		Maximum QP for I frames. Used when enableMaxQP is enabled; the valid QP range depends on codec/bit depth. (from 0 to 255)
maxQPP	int		Maximum QP for P frames. Used when enableMaxQP is enabled; the valid QP range depends on codec/bit depth. (from 0 to 255)
minQPB	int		Minimum QP for B frames. Used when enableMinQP is enabled; the valid QP range depends on codec/bit depth. (from 0 to 255)
minQPI	int		Minimum QP for I frames. Used when enableMinQP is enabled; the valid QP range depends on codec/bit depth. (from 0 to 255)
minQPP	int		Minimum QP for P frames. Used when enableMinQP is enabled; the valid QP range depends on codec/bit depth. (from 0 to 255)
output.422	option_fixed		Request 4:2:2 chroma output. Requires GPU/codec support; output.444 takes precedence. AV1 currently supports 4:2:0 only. Supported values: `false`, `true`.
sliceMode	option		Slice partitioning: default, macroblocks, bytes, macroblock rows, or number of slices. AV1 uses tiles. NVIDIA SDK 13.0 limits slicing to a single slice. Supported values: `default`, `mb`, `bytes`, `mb_rows`, `slice_number`. `mb_rows`: mb_rows `slice_number`: slice_number
sliceModeData	int		Slice partition size/count interpreted according to sliceMode. NVIDIA SDK 13.0 limits this to a single slice. (from 0 to 2147483647)
useBFramesAsRef	option		B-frame reference mode: 0 disables B references, 1 allows each B-frame, 2 uses a middle B-frame. Requires codec/GPU support. (from 0 to 2) Supported values: `0`, `1`, `2`.
vbvBufferSize	string		VBV buffer size in bits. Takes precedence over bufsize; a positive bufsize.msec overrides both.
vbvInitialDelay	string		Initial VBV occupancy in bits. Takes precedence over initialdelay.

H.265 HEVC (x265, SW)

Configuration Parameter: libx265

Additional attributes

Name	Type	Default	Description
preset	option	superfast	Set the x265 preset. Supported values: `ultrafast`, `superfast`, `veryfast`, `faster`, `fast`, `medium`, `slow`, `slower`, `veryslow`, `placebo`.
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). Supported values: `psnr`, `ssim`, `grain`, `fastdecode`, `zerolatency`.
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. Range: minimum 0.0; maximum 1.0.
x265-params	string		Set x265 options using a list of key=value couples separated by ":". See x265 help for a list of options.
crf	double		set the x265 crf. Requires an FFmpeg build with libx265 enabled.
qp	int		set the x265 qp. Requires an FFmpeg build with libx265 enabled.
profile	string		set the x265 profile. Requires an FFmpeg build with libx265 enabled.
x265-stats	string		Filename for 2 pass stats. Requires an FFmpeg build with libx265 enabled.
udu_sei	option_fixed		Use user data unregistered SEI if available. Requires an FFmpeg build with libx265 enabled. Supported values: `false`, `true`.
a53cc	option_fixed		Use A53 Closed Captions (if available). Requires an FFmpeg build with libx265 enabled. Supported values: `false`, `true`.
dolbyvision	option_fixed		Enable Dolby Vision RPU coding. Requires an FFmpeg build with libx265 enabled. Supported values: `false`, `true`.

H.266 VVC (Fraunhofer VVenC, SW)

Configuration Parameter: libvvenc

Additional attributes

Name	Type	Default	Description
preset	option_fixed		Change options to trade off compression efficiency against encoding speed Supported values: `faster`, `fast`, `medium`, `slow`, `slower`. `faster`: 0 `fast`: 1 `medium`: 2 `slow`: 3 `slower`: 4
qp	int		Set quantization Range: minimum -1; maximum 63.
period	int		Set (intra) refresh period in seconds Range: minimum 1; maximum 2147483647.
vvenc-params	string		Set the vvenc configuration using a :-separated list of key=value parameters
level	string		Specify level (as defined by Annex A)
tier	option_fixed	high	Set vvc tier Supported values: `main`, `high`. `main`: main `high`: high
qpa	option_fixed		set subjective (perceptually motivated) optimization (default true) Supported values: `false`, `true`.
passlogfile	string		Filename for 2 pass stats
stats	string		Filename for 2 pass stats

Hap (Vidvox, SW)

Configuration Parameter: hap

Additional attributes

Name	Type	Default	Description
format	option	hap	Hap 1 (DXT1 textures)Hap Alpha (DXT5 textures)Hap Q (DXT5-YCoCg textures) Supported values: `hap`, `hap_alpha`, `hap_q`.
chunks	int	1	Chunk count Range: minimum 1.0; maximum 64.0.
compressor	option	snappy	Second-stage compressor NoneSnappy Supported values: `none`, `snappy`.

HuffYUV (Lossless, SW)

Configuration Parameter: huffyuv

Additional attributes

Name	Type	Default	Description
non_deterministic	option_fixed		Allow multithreading for e.g. context=1 at the expense of determinism (default false) Supported values: `false`, `true`.
pred	option		Prediction method (from 0 to 2) (default left) Supported values: `left`, `plane`, `median`. `left`: 0: left `plane`: 1: plane `median`: 2: median

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	int		Intel target usage quality: 1 is fastest, 7 is best quality. Supported settings depend on the device and implementation. Range: minimum 1; maximum 7.
g	int	30	This is the IDR period for H264
profile	option_fixed	Auto	Set the profile Supported values: `Auto`, `Baseline`, `Main`, `Extended`, `High`, `Progressive High`.
level	option_fixed	Auto	Native Intel H.264 level. Auto lets Media SDK select the level. The listed numeric levels are passed through without SDK normalization. Supported values: `Auto`, `1.0b`, `1.1`, `1.2`, `1.3`, `2.1`, `2.2`, `3.1`, `3.2`, `4.1`, `4.2`, `5.1`, `5.2`.
rc_type	option_fixed	vbr	The rate control type. vcm and quality_vbr require the MFCodecs encoder; the legacy MWriter Quick Sync encoder falls back to VBR for these two values. Supported values: `cbr`, `vbr`, `cqp`, `avbr`, `vbr_la`, `vbr_la_hrd`, `quality`, `quality_la`, `vcm`, `quality_vbr`.
maxrate	int		The maximum bit rate in bps is the peak bit rate used for VBR rate control
bufsize	int		Rate control buffer size in bytes (Media SDK BufferSizeInKB = value / 1000). 0 lets Media SDK choose.
initialdelay	int	0	Initial VBV delay in bytes (Media SDK InitialDelayInKB = value / 1000). 0 lets Media SDK choose.
bf	int		Number of consecutive B-frames. Media SDK GopRefDist is bf+1; device/profile limits apply. Range: minimum 0.
ref_frames	int		Number of reference frames; if NumRefFrame = 0, this parameter is not specified. Range: minimum 0; maximum 16.
cavlc	option_fixed	false	Enable/disable Context-adaptive variable-length coding mode. Supported values: `true`, `false`.
size	string		Resolution of video. Format: WIDTHxHEIGHT.
icq_quality	int		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	Intel implementation selection: -2 automatic, -1 software, 0..3 hardware adapter 1..4 (MFX_IMPL_HARDWARE..HARDWARE4); unavailable adapters fall back to automatic. Range: minimum -2; maximum 3.
use_vpp	bool	false	MWriter legacy encoder only: use Intel VPP for frame conversion and scaling. Ignored by the MFCodecs encoder.
async_depth	int		Number of asynchronous Intel encode tasks. Low-delay mode forces a depth of 1. (from 0 to 65535)
hrd_conformance	option_fixed		Enable Intel HRD conformance (MFCodecs encoder only). This also affects dynamic bitrate reconfiguration. Supported values: `false`, `true`.
low_delay	option_fixed		MFCodecs encoder only: use low-delay encoding; default B-frame count becomes 0 and async depth becomes 1. Ignored by the legacy MWriter H.264 Quick Sync encoder. Supported values: `false`, `true`.
exact_gop	option_fixed		Request strict GOP structure. Supported values: `false`, `true`.
interlace	option		Frame scan structure supplied to Intel Media SDK. Supported values: `auto`, `progressive`, `top`, `bottom`. `auto`: auto `progressive`: progressive `top`: top `bottom`: bottom
BufferSize	string		VBV buffer size in bytes (Media SDK BufferSizeInKB = value / 1000). A positive value takes precedence over bufsize.

JPEG XS (SVT, SW)

Configuration Parameter: libsvtjpegxs

Additional attributes

Name	Type	Default	Description
bpp	int	2	Bits per pixel
decomp_v	int		vertical decomposition level Range: minimum -1; maximum 2.
decomp_h	int		horizontal decomposition level Range: minimum -1; maximum 5.
quantization	int		Quantization algorithm: deadzone:0, uniform:1 Supported values: `deadzone`, `uniform`. Range: minimum -1; maximum 1.
coding-signs	int		Enable Signs handling strategy: disable:0, fast:1, full:2 Supported values: `disable`, `fast`, `full`. Range: minimum -1; maximum 2.
coding-sigf	int		Enable Significance coding Range: minimum -1; maximum 1.
coding-vpred	int		Enable Vertical Prediction coding: disable:0, zero prediction residuals:1, zero coefficients:2 Supported values: `disable`, `no_residuals`, `no_coeffs`. `no_residuals`: no_residuals `no_coeffs`: no_coeffs Range: minimum -1; maximum 2.

MJPEG (Motion JPEG)

Configuration Parameter: mjpeg

Additional attributes

Name	Type	Default	Description
color_range	option	jpeg	MPEG vs JPEG YUV range. UnspecifiedMPEG (219*2^(n-8))JPEG (2^n-1) Supported values: `unspecified`, `mpeg`, `jpeg`.
huffman	option		Huffman table strategy (from 0 to 1) (default optimal) Supported values: `default`, `optimal`. `default`: 0: default `optimal`: 1: optimal
force_duplicated_matrix	option_fixed		Always write luma and chroma matrix for mjpeg, useful for rtp streaming. (default false) Supported values: `false`, `true`.
mpv_flags	flags		Flags common for all mpegvideo-based encoders. (default 0) Supported values: `skip_rd`, `strict_gop`, `qp_rd`, `cbp_rd`, `naq`. `skip_rd`: RD optimal MB level residual skipping `strict_gop`: Strictly enforce gop size `qp_rd`: Use rate distortion optimization for qp selection `cbp_rd`: use rate distortion optimization for CBP `naq`: normalize adaptive quantization
luma_elim_threshold	int		single coefficient elimination threshold for luminance (negative values also consider dc coefficient) (from INT_MIN to INT_MAX) (default 0)
chroma_elim_threshold	int		single coefficient elimination threshold for chrominance (negative values also consider dc coefficient) (from INT_MIN to INT_MAX) (default 0)
quantizer_noise_shaping	int		FFmpeg quantizer_noise_shaping option. (from 0 to INT_MAX) (default 0)
error_rate	int		Simulate errors in the bitstream to test error concealment. (from 0 to INT_MAX) (default 0)
qsquish	double		how to keep quantizer between qmin and qmax (0 = clip, 1 = use differentiable function) (from 0 to 99) (default 0)
rc_qmod_amp	double		experimental quantizer modulation (from -FLT_MAX to FLT_MAX) (default 0)
rc_qmod_freq	int		experimental quantizer modulation (from INT_MIN to INT_MAX) (default 0)
rc_eq	string		Set rate control equation. When computing the expression, besides the standard functions defined in the section 'Expression Evaluation', the following functions are available: bits2qp(bits), qp2bits(qp). Also the following constants are available: iTex pTex tex mv fCode iCount mcVar var isI isP isB avgQP qComp avgIITex avgPITex avgPPTex avgBPTex avgTex.
rc_init_cplx	double		initial complexity for 1-pass encoding (from -FLT_MAX to FLT_MAX) (default 0)
rc_buf_aggressivity	double		currently useless (from -FLT_MAX to FLT_MAX) (default 1)
border_mask	double		increase the quantizer for macroblocks close to borders (from -FLT_MAX to FLT_MAX) (default 0)
skip_threshold	int		Frame skip threshold (from INT_MIN to INT_MAX) (default 0)
skip_factor	int		Frame skip factor (from INT_MIN to INT_MAX) (default 0)
skip_exp	int		Frame skip exponent (from INT_MIN to INT_MAX) (default 0)
skip_cmp	option		Frame skip compare function (from INT_MIN to INT_MAX) (default dctmax) Supported values: `sad`, `sse`, `satd`, `dct`, `psnr`, `bit`, `rd`, `zero`, `vsad`, `vsse`, `nsse`, `dct264`, `dctmax`, `chroma`, `msad`. `sad`: 0: Sum of absolute differences, fast `sse`: 1: Sum of squared errors `satd`: 2: Sum of absolute Hadamard transformed differences `dct`: 3: Sum of absolute DCT transformed differences `psnr`: 4: Sum of squared quantization errors, low quality `bit`: 5: Number of bits needed for the block `rd`: 6: Rate distortion optimal, slow `zero`: 7: Zero `vsad`: 8: Sum of absolute vertical differences `vsse`: 9: Sum of squared vertical differences `nsse`: 10: Noise preserving sum of squared differences `dct264`: 14: dct264 `dctmax`: 13: dctmax `chroma`: 256: chroma `msad`: 15: Sum of absolute differences, median predicted
noise_reduction	int		Noise reduction (from INT_MIN to INT_MAX) (default 0)
ps	int		RTP payload size in bytes (from INT_MIN to INT_MAX) (default 0)
lmin	int		minimum Lagrange factor (VBR) (from 0 to INT_MAX) (default 236)
lmax	int		maximum Lagrange factor (VBR) (from 0 to INT_MAX) (default 3658)

MPEG-1 Video (SW)

Configuration Parameter: mpeg1video

Additional attributes

Name	Type	Description
mpv_flags	flags	Flags common for all mpegvideo-based encoders. RD optimal MB level residual skippingStrictly enforce GOP sizeUse rate distortion optimization for qp selectionuse rate distortion optimization for CBP Supported values: `skip_rd`, `strict_gop`, `qp_rd`, `cbp_rd`, `naq`, `mv0`. `naq`: normalize adaptive quantization `mv0`: always try a mb with mv=<0,0>
gop_timecode	string	MPEG GOP Timecode in hh:mm:ss[:;.]ff format. Overrides timecode_frame_start.
drop_frame_timecode	option_fixed	Timecode is in drop frame format. (default false) Supported values: `false`, `true`.
scan_offset	option_fixed	Reserve space for SVCD scan offset user data. (default false) Supported values: `false`, `true`.
b_sensitivity	int	Adjust sensitivity of b_frame_strategy 1 (from 1 to INT_MAX) (default 40)
brd_scale	int	Downscale frames for dynamic B-frame decision (from 0 to 3) (default 0)
luma_elim_threshold	int	single coefficient elimination threshold for luminance (negative values also consider dc coefficient) (from INT_MIN to INT_MAX) (default 0)
chroma_elim_threshold	int	single coefficient elimination threshold for chrominance (negative values also consider dc coefficient) (from INT_MIN to INT_MAX) (default 0)
quantizer_noise_shaping	int	FFmpeg quantizer_noise_shaping option. (from 0 to INT_MAX) (default 0)
error_rate	int	Simulate errors in the bitstream to test error concealment. (from 0 to INT_MAX) (default 0)
qsquish	double	how to keep quantizer between qmin and qmax (0 = clip, 1 = use differentiable function) (from 0 to 99) (default 0)
rc_qmod_amp	double	experimental quantizer modulation (from -FLT_MAX to FLT_MAX) (default 0)
rc_qmod_freq	int	experimental quantizer modulation (from INT_MIN to INT_MAX) (default 0)
rc_eq	string	Set rate control equation. When computing the expression, besides the standard functions defined in the section 'Expression Evaluation', the following functions are available: bits2qp(bits), qp2bits(qp). Also the following constants are available: iTex pTex tex mv fCode iCount mcVar var isI isP isB avgQP qComp avgIITex avgPITex avgPPTex avgBPTex avgTex.
rc_init_cplx	double	initial complexity for 1-pass encoding (from -FLT_MAX to FLT_MAX) (default 0)
rc_buf_aggressivity	double	currently useless (from -FLT_MAX to FLT_MAX) (default 1)
border_mask	double	increase the quantizer for macroblocks close to borders (from -FLT_MAX to FLT_MAX) (default 0)
skip_threshold	int	Frame skip threshold (from INT_MIN to INT_MAX) (default 0)
skip_factor	int	Frame skip factor (from INT_MIN to INT_MAX) (default 0)
skip_exp	int	Frame skip exponent (from INT_MIN to INT_MAX) (default 0)
skip_cmp	option	Frame skip compare function (from INT_MIN to INT_MAX) (default dctmax) Supported values: `sad`, `sse`, `satd`, `dct`, `psnr`, `bit`, `rd`, `zero`, `vsad`, `vsse`, `nsse`, `dct264`, `dctmax`, `chroma`, `msad`. `sad`: 0: Sum of absolute differences, fast `sse`: 1: Sum of squared errors `satd`: 2: Sum of absolute Hadamard transformed differences `dct`: 3: Sum of absolute DCT transformed differences `psnr`: 4: Sum of squared quantization errors, low quality `bit`: 5: Number of bits needed for the block `rd`: 6: Rate distortion optimal, slow `zero`: 7: Zero `vsad`: 8: Sum of absolute vertical differences `vsse`: 9: Sum of squared vertical differences `nsse`: 10: Noise preserving sum of squared differences `dct264`: 14: dct264 `dctmax`: 13: dctmax `chroma`: 256: chroma `msad`: 15: Sum of absolute differences, median predicted
noise_reduction	int	Noise reduction (from INT_MIN to INT_MAX) (default 0)
ps	int	RTP payload size in bytes (from INT_MIN to INT_MAX) (default 0)
motion_est	option	motion estimation algorithm (from 0 to 2) (default epzs) Supported values: `zero`, `epzs`, `xone`. `zero`: 0: zero `epzs`: 1: epzs `xone`: 2: xone
mepc	int	Motion estimation bitrate penalty compensation (1.0 = 256) (from INT_MIN to INT_MAX) (default 256)
mepre	int	pre motion estimation (from INT_MIN to INT_MAX) (default 0)
intra_penalty	int	Penalty for intra blocks in block decision (from 0 to 1.07374e+09) (default 0)
timecode_frame_start	string	GOP timecode frame start number, in non-drop-frame format (from -1 to I64_MAX) (default -1)
b_strategy	int	Strategy to choose between I/P/B-frames (from 0 to 2) (default 0)
lmin	int	minimum Lagrange factor (VBR) (from 0 to INT_MAX) (default 236)
lmax	int	maximum Lagrange factor (VBR) (from 0 to INT_MAX) (default 3658)
sc_threshold	int	Scene change threshold (from INT_MIN to INT_MAX) (default 0)

MPEG-2 Video (SW)

Configuration Parameter: mpeg2video

Additional attributes

Name	Type	Default	Description
mpv_flags	flags		Flags common for all mpegvideo-based encoders. RD optimal MB level residual skippingStrictly enforce GOP sizeUse rate distortion optimization for qp selectionuse rate distortion optimization for CBP Supported values: `skip_rd`, `strict_gop`, `qp_rd`, `cbp_rd`, `naq`, `mv0`. `naq`: normalize adaptive quantization `mv0`: always try a mb with mv=<0,0>
gop_timecode	string		GOP timecode value
v422	option_fixed	false	Indicates whether captioning used 4:2:2 chroma subsampling (4:2:0 overwise). Supported values: `true`, `false`.
interlace	int	-1	Interlacing: 1 - interlaced, 0 - progressive, -1 - auto. Range: minimum -1.0; maximum 1.0.
drop_frame_timecode	option_fixed		Timecode is in drop frame format. (default false) Supported values: `false`, `true`.
scan_offset	option_fixed		Reserve space for SVCD scan offset user data. (default false) Supported values: `false`, `true`.
b_sensitivity	int		Adjust sensitivity of b_frame_strategy 1 (from 1 to INT_MAX) (default 40)
brd_scale	int		Downscale frames for dynamic B-frame decision (from 0 to 3) (default 0)
intra_dc_precision	int		Precision of the DC coefficient - 8 (from -1 to 3) (default -1)
intra_vlc	option_fixed		Use MPEG-2 intra VLC table. (default false) Supported values: `false`, `true`.
non_linear_quant	option_fixed		Use nonlinear quantizer. (default false) Supported values: `false`, `true`.
alternate_scan	option_fixed		Enable alternate scantable. (default false) Supported values: `false`, `true`.
a53cc	option_fixed		Use A53 Closed Captions (if available) (default true) Supported values: `false`, `true`.
seq_disp_ext	option		Write sequence_display_extension blocks. (from -1 to 1) (default auto) Supported values: `auto`, `never`, `always`. `auto`: -1: auto `never`: 0: never `always`: 1: always
video_format	option		Video_format in the sequence_display_extension indicating the source of the video. (from 0 to 7) (default unspecified) Supported values: `component`, `pal`, `ntsc`, `secam`, `mac`, `unspecified`. `component`: 0: component `pal`: 1: pal `ntsc`: 2: ntsc `secam`: 3: secam `mac`: 4: mac `unspecified`: 5: unspecified
luma_elim_threshold	int		single coefficient elimination threshold for luminance (negative values also consider dc coefficient) (from INT_MIN to INT_MAX) (default 0)
chroma_elim_threshold	int		single coefficient elimination threshold for chrominance (negative values also consider dc coefficient) (from INT_MIN to INT_MAX) (default 0)
quantizer_noise_shaping	int		FFmpeg quantizer_noise_shaping option. (from 0 to INT_MAX) (default 0)
error_rate	int		Simulate errors in the bitstream to test error concealment. (from 0 to INT_MAX) (default 0)
qsquish	double		how to keep quantizer between qmin and qmax (0 = clip, 1 = use differentiable function) (from 0 to 99) (default 0)
rc_qmod_amp	double		experimental quantizer modulation (from -FLT_MAX to FLT_MAX) (default 0)
rc_qmod_freq	int		experimental quantizer modulation (from INT_MIN to INT_MAX) (default 0)
rc_eq	string		Set rate control equation. When computing the expression, besides the standard functions defined in the section 'Expression Evaluation', the following functions are available: bits2qp(bits), qp2bits(qp). Also the following constants are available: iTex pTex tex mv fCode iCount mcVar var isI isP isB avgQP qComp avgIITex avgPITex avgPPTex avgBPTex avgTex.
rc_init_cplx	double		initial complexity for 1-pass encoding (from -FLT_MAX to FLT_MAX) (default 0)
rc_buf_aggressivity	double		currently useless (from -FLT_MAX to FLT_MAX) (default 1)
border_mask	double		increase the quantizer for macroblocks close to borders (from -FLT_MAX to FLT_MAX) (default 0)
skip_threshold	int		Frame skip threshold (from INT_MIN to INT_MAX) (default 0)
skip_factor	int		Frame skip factor (from INT_MIN to INT_MAX) (default 0)
skip_exp	int		Frame skip exponent (from INT_MIN to INT_MAX) (default 0)
skip_cmp	option		Frame skip compare function (from INT_MIN to INT_MAX) (default dctmax) Supported values: `sad`, `sse`, `satd`, `dct`, `psnr`, `bit`, `rd`, `zero`, `vsad`, `vsse`, `nsse`, `dct264`, `dctmax`, `chroma`, `msad`. `sad`: 0: Sum of absolute differences, fast `sse`: 1: Sum of squared errors `satd`: 2: Sum of absolute Hadamard transformed differences `dct`: 3: Sum of absolute DCT transformed differences `psnr`: 4: Sum of squared quantization errors, low quality `bit`: 5: Number of bits needed for the block `rd`: 6: Rate distortion optimal, slow `zero`: 7: Zero `vsad`: 8: Sum of absolute vertical differences `vsse`: 9: Sum of squared vertical differences `nsse`: 10: Noise preserving sum of squared differences `dct264`: 14: dct264 `dctmax`: 13: dctmax `chroma`: 256: chroma `msad`: 15: Sum of absolute differences, median predicted
noise_reduction	int		Noise reduction (from INT_MIN to INT_MAX) (default 0)
ps	int		RTP payload size in bytes (from INT_MIN to INT_MAX) (default 0)
motion_est	option		motion estimation algorithm (from 0 to 2) (default epzs) Supported values: `zero`, `epzs`, `xone`. `zero`: 0: zero `epzs`: 1: epzs `xone`: 2: xone
mepc	int		Motion estimation bitrate penalty compensation (1.0 = 256) (from INT_MIN to INT_MAX) (default 256)
mepre	int		pre motion estimation (from INT_MIN to INT_MAX) (default 0)
intra_penalty	int		Penalty for intra blocks in block decision (from 0 to 1.07374e+09) (default 0)
timecode_frame_start	string		GOP timecode frame start number, in non-drop-frame format (from -1 to I64_MAX) (default -1)
b_strategy	int		Strategy to choose between I/P/B-frames (from 0 to 2) (default 0)
lmin	int		minimum Lagrange factor (VBR) (from 0 to INT_MAX) (default 236)
lmax	int		maximum Lagrange factor (VBR) (from 0 to INT_MAX) (default 3658)
sc_threshold	int		Scene change threshold (from INT_MIN to INT_MAX) (default 0)
dc	option_fixed		Intra DC precision in bits (deprecated FFmpeg option; 0 and 8 both mean 8 bits). Ignored when intra_dc_precision (0..3) is set. Supported values: `0`, `8`, `9`, `10`, `11`.

MPEG-4 Part 2 Video (ASP, SW)

Configuration Parameter: mpeg4

Additional attributes

Name	Type	Default	Description
data_partitioning	int	0	Use data partitioning. Range: minimum 0.0; maximum 1.0.
mpv_flags	flags		Flags common for all mpegvideo-based encoders. RD optimal MB level residual skippingStrictly enforce GOP sizeUse rate distortion optimization for qp selectionuse rate distortion optimization for CBP Supported values: `skip_rd`, `strict_gop`, `qp_rd`, `cbp_rd`, `naq`, `mv0`. `naq`: normalize adaptive quantization `mv0`: always try a mb with mv=<0,0>
interlace	int	-1	Interlacing: 1 - interlaced, 0 - progressive, -1 - auto. Range: minimum -1.0; maximum 1.0.
alternate_scan	option_fixed		Enable alternate scantable. (default false) Supported values: `false`, `true`.
mpeg_quant	int		Use MPEG quantizers instead of H.263 (from 0 to 1) (default 0)
b_sensitivity	int		Adjust sensitivity of b_frame_strategy 1 (from 1 to INT_MAX) (default 40)
brd_scale	int		Downscale frames for dynamic B-frame decision (from 0 to 3) (default 0)
luma_elim_threshold	int		single coefficient elimination threshold for luminance (negative values also consider dc coefficient) (from INT_MIN to INT_MAX) (default 0)
chroma_elim_threshold	int		single coefficient elimination threshold for chrominance (negative values also consider dc coefficient) (from INT_MIN to INT_MAX) (default 0)
quantizer_noise_shaping	int		FFmpeg quantizer_noise_shaping option. (from 0 to INT_MAX) (default 0)
error_rate	int		Simulate errors in the bitstream to test error concealment. (from 0 to INT_MAX) (default 0)
qsquish	double		how to keep quantizer between qmin and qmax (0 = clip, 1 = use differentiable function) (from 0 to 99) (default 0)
rc_qmod_amp	double		experimental quantizer modulation (from -FLT_MAX to FLT_MAX) (default 0)
rc_qmod_freq	int		experimental quantizer modulation (from INT_MIN to INT_MAX) (default 0)
rc_eq	string		Set rate control equation. When computing the expression, besides the standard functions defined in the section 'Expression Evaluation', the following functions are available: bits2qp(bits), qp2bits(qp). Also the following constants are available: iTex pTex tex mv fCode iCount mcVar var isI isP isB avgQP qComp avgIITex avgPITex avgPPTex avgBPTex avgTex.
rc_init_cplx	double		initial complexity for 1-pass encoding (from -FLT_MAX to FLT_MAX) (default 0)
rc_buf_aggressivity	double		currently useless (from -FLT_MAX to FLT_MAX) (default 1)
border_mask	double		increase the quantizer for macroblocks close to borders (from -FLT_MAX to FLT_MAX) (default 0)
skip_threshold	int		Frame skip threshold (from INT_MIN to INT_MAX) (default 0)
skip_factor	int		Frame skip factor (from INT_MIN to INT_MAX) (default 0)
skip_exp	int		Frame skip exponent (from INT_MIN to INT_MAX) (default 0)
skip_cmp	option		Frame skip compare function (from INT_MIN to INT_MAX) (default dctmax) Supported values: `sad`, `sse`, `satd`, `dct`, `psnr`, `bit`, `rd`, `zero`, `vsad`, `vsse`, `nsse`, `dct264`, `dctmax`, `chroma`, `msad`. `sad`: 0: Sum of absolute differences, fast `sse`: 1: Sum of squared errors `satd`: 2: Sum of absolute Hadamard transformed differences `dct`: 3: Sum of absolute DCT transformed differences `psnr`: 4: Sum of squared quantization errors, low quality `bit`: 5: Number of bits needed for the block `rd`: 6: Rate distortion optimal, slow `zero`: 7: Zero `vsad`: 8: Sum of absolute vertical differences `vsse`: 9: Sum of squared vertical differences `nsse`: 10: Noise preserving sum of squared differences `dct264`: 14: dct264 `dctmax`: 13: dctmax `chroma`: 256: chroma `msad`: 15: Sum of absolute differences, median predicted
noise_reduction	int		Noise reduction (from INT_MIN to INT_MAX) (default 0)
ps	int		RTP payload size in bytes (from INT_MIN to INT_MAX) (default 0)
motion_est	option		motion estimation algorithm (from 0 to 2) (default epzs) Supported values: `zero`, `epzs`, `xone`. `zero`: 0: zero `epzs`: 1: epzs `xone`: 2: xone
mepc	int		Motion estimation bitrate penalty compensation (1.0 = 256) (from INT_MIN to INT_MAX) (default 256)
mepre	int		pre motion estimation (from INT_MIN to INT_MAX) (default 0)
intra_penalty	int		Penalty for intra blocks in block decision (from 0 to 1.07374e+09) (default 0)
b_strategy	int		Strategy to choose between I/P/B-frames (from 0 to 2) (default 0)
lmin	int		minimum Lagrange factor (VBR) (from 0 to INT_MAX) (default 236)
lmax	int		maximum Lagrange factor (VBR) (from 0 to INT_MAX) (default 3658)
sc_threshold	int		Scene change threshold (from INT_MIN to INT_MAX) (default 0)

OpenJPEG JPEG 2000

Configuration Parameter: libopenjpeg

Additional attributes

Name	Type	Default	Description
format	option_fixed	jp2	Codec Format. Possible values: j2k, jp2. Supported values: `j2k`, `jp2`.
profile	option_fixed	jpeg2000	Profile name. Possible values: jpeg2000, cinema2k, cinema4k. Supported values: `jpeg2000`, `cinema2k`, `cinema4k`.
cinema_mode	option_fixed	off	Digital Cinema mode. Possible values: off, 2k_24, 2k_48, 4k_24 Supported values: `off`, `2k_24`, `2k_48`, `4k_24`.
numresolution	int	6	Number of resolutions Range: minimum 0; maximum 33.
prog_order	option		Progression Order (from 0 to 4) (default lrcp) Supported values: `lrcp`, `rlcp`, `rpcl`, `pcrl`, `cprl`. `lrcp`: 0: lrcp `rlcp`: 1: rlcp `rpcl`: 2: rpcl `pcrl`: 3: pcrl `cprl`: 4: cprl
irreversible	int		FFmpeg irreversible option. (from 0 to 1) (default 0)
disto_alloc	int		FFmpeg disto_alloc option. (from 0 to 1) (default 1)
fixed_quality	int		FFmpeg fixed_quality option. (from 0 to 1) (default 0)

PNG (Image Sequence, SW)

Configuration Parameter: png

Additional attributes

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

QuickTime Animation (RLE, SW)

Configuration Parameter: qtrle

Uncompressed 4:2:2 10-bit (SW)

Configuration Parameter: v210

Uncompressed 4:2:2 8-bit (SW)

Configuration Parameter: rawvideo

VP8 (Google, SW)

Configuration Parameter: libvpx

Additional attributes

Name	Type	Default	Description
cpu-used	int	3	Quality/Speed ratio modifier Range: minimum -16; maximum 16.
quality	option	good	Encoding quality (FFmpeg alias: deadline). SDK default good. Supported values: `best`, `good`, `realtime`. `best`: best `realtime`: realtime
max-intra-rate	int	-1	Maximum I-frame bitrate (pct) 0=unlimited Range: minimum -1.0; maximum 2147483647.
speed	int	3	Encoding speed Range: minimum -16.0; maximum 16.0.
crf	int	-1	Select the quality for constant quality mode Range: minimum -1; maximum 63.0.
lag-in-frames	int	4	Number of frames to look ahead for alternate reference frame selection Range: minimum -1.0; maximum 2147483647.
auto-alt-ref	int	-1	Enable use of alternate reference frames (2-pass only) Range: minimum -1.0; maximum 2.0.
qmin	int	4	Min video quantizer scale (VBR) Range: minimum -1.0; maximum 69.0.
qmax	int	48	Max video quantizer scale (VBR) Range: minimum -1.0; maximum 1024.0.
arnr-maxframes	int		altref noise reduction max frame count (from -1 to INT_MAX) (default -1)
arnr-strength	int		altref noise reduction filter strength (from -1 to INT_MAX) (default -1)
arnr-type	option		altref noise reduction filter type (from -1 to INT_MAX) (default -1) Supported values: `backward`, `forward`, `centered`. `backward`: 1: backward `forward`: 2: forward `centered`: 3: centered
tune	option		Tune the encoding to a specific scenario (from -1 to INT_MAX) (default -1) Supported values: `psnr`, `ssim`. `psnr`: 0: psnr `ssim`: 1: ssim
error-resilient	flags		Error resilience configuration (default 0) Supported values: `default`, `partitions`. `default`: Improve resiliency against losses of whole frames `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 prediction is still done over the partition boundary.
static-thresh	int		A change threshold on blocks below which they will be skipped by the encoder (from 0 to INT_MAX) (default 0)
drop-threshold	int		Frame drop threshold (from INT_MIN to INT_MAX) (default 0)
noise-sensitivity	int		Noise sensitivity (from 0 to 4) (default 0)
undershoot-pct	int		Datarate undershoot (min) target (%) (from -1 to 100) (default -1)
overshoot-pct	int		Datarate overshoot (max) target (%) (from -1 to 1000) (default -1)
ts-parameters	string		Temporal scaling configuration using a :-separated list of key=value parameters
screen-content-mode	int		Encoder screen content mode (from -1 to 2) (default -1)
vp8flags	flags		FFmpeg vp8flags option. (default 0) Supported values: `error_resilient`, `altref`. `error_resilient`: enable error resilience `altref`: enable use of alternate reference frames (VP8/2-pass only)
arnr_max_frames	int		altref noise reduction max frame count (from 0 to 15) (default 0)
arnr_strength	int		altref noise reduction filter strength (from 0 to 6) (default 3)
arnr_type	int		altref noise reduction filter type (from 1 to 3) (default 3)
rc_lookahead	int		Number of frames to look ahead for alternate reference frame selection (from 0 to 25) (default 25)
sharpness	int		Increase sharpness at the expense of lower PSNR (from -1 to 7) (default -1)

VP9 (Google, SW)

Configuration Parameter: libvpx-vp9

Additional attributes

Name	Type	Default	Description
g	int	75	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
auto-alt-ref	int	0	Enable use of alternate reference frames (2-pass only) Range: minimum -1.0; maximum 6.
lag-in-frames	int	4	Number of frames to look ahead for alternate reference frame selection Range: minimum -1.0; maximum 2147483647.
arnr-maxframes	int	0	altref noise reduction max frame count Range: minimum -1.0; maximum 2147483647.
arnr-strength	int	3	altref noise reduction filter strength Range: minimum -1.0; maximum 2147483647.
arnr-type	option	centered	Altref noise reduction filter type. Accepts named values. Supported values: `backward`, `forward`, `centered`. `backward`: backward `forward`: forward `centered`: centered
arnr_type	int	3	Legacy numeric alias for the altref noise reduction filter type: 1=backward, 2=forward, 3=centered. Use arnr-type for named values. Supported values: `1`, `2`, `3`. Range: minimum 1; maximum 3.
tune	option		Tune the encoding to a specific scenario Supported values: `psnr`, `ssim`. `psnr`: psnr `ssim`: ssim
quality	option	realtime	Encoding quality (FFmpeg alias: deadline). SDK default realtime. Supported values: `best`, `good`, `realtime`. `best`: best `good`: good
error-resilient	flags		Error resilience configuration Supported values: `default`, `partitions`. `default`: Improve resiliency against losses of whole frames `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.
max-intra-rate	int	-1	Maximum I-frame bitrate (pct) 0=unlimited Range: minimum -1.0; maximum 2147483647.
er	option_fixed		Improve resiliency against losses of whole framesThe 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. Supported values: `default`, `partitions`.
crf	int	10	Select the quality for constant quality mode Range: minimum -1.0; maximum 63.0.
static-thresh	int	0	A change threshold on blocks below which they will be skipped by the encoder Range: minimum 0.0; maximum 2147483647.
drop-threshold	int	0	Frame drop threshold Range: minimum -2147483648; maximum 2147483647.
noise-sensitivity	int	0	Noise sensitivity Range: minimum 0.0; maximum 4.0.
undershoot-pct	int	-1	Datarate undershoot (min) target (%) Range: minimum -1.0; maximum 100.0.
overshoot-pct	int	-1	Datarate overshoot (max) target (%) Range: minimum -1.0; maximum 1000.0.
cpu-used	int	4	Quality/Speed ratio modifier Range: minimum -8.0; maximum 8.0.
lossless	int	-1	Lossless mode Range: minimum -1.0; maximum 1.0.
tile-columns	int	2	Number of tile columns to use, log2 Range: minimum -1.0; maximum 6.0.
tile-rows	int	-1	Number of tile rows to use, log2 Range: minimum -1.0; maximum 2.0.
frame-parallel	option_fixed	true	Enable frame parallel decodability features Supported values: `auto`, `false`, `true`.
aq-mode	option		Adaptive quantization mode Supported values: `none`, `variance`, `complexity`, `cyclic`, `equator360`. `none`: Aq not used `variance`: Variance based Aq `complexity`: Complexity based Aq `cyclic`: Cyclic Refresh Aq `equator360`: 360 video Aq
aq_mode	option_fixed		Aq not usedVariance based AqComplexity based AqCyclic Refresh Aq360 video Aq Supported values: `none`, `variance`, `complexity`, `cyclic`, `equator360`.
level	double	-1.000000	Specify level Range: minimum -1.0; maximum 6.2.
row-mt	option_fixed	true	Row based multi-threading Supported values: `auto`, `false`, `true`.
tune-content	option		Tune content type Supported values: `default`, `screen`, `film`. `default`: Regular video content `screen`: Screen capture content `film`: Film content; improves grain retention
tune_content	option_fixed		Regular video contentScreen capture contentFilm content; improves grain retention Supported values: `default`, `screen`, `film`.
corpus-complexity	int	-1	Corpus vbr complexity midpoint Range: minimum -1.0; maximum 10000.0.
speed	int	5	Encoding speed Range: minimum -16.0; maximum 16.0.
vp8flags	flags		VP8 compatibility flags. Supported values: `error_resilient`, `altref`. `error_resilient`: Enable error resilience. `altref`: Enable alternate reference frames in VP8 two-pass mode.
arnr_max_frames	int	0	Altref noise reduction max frame count Range: minimum 0.0; maximum 15.0.
arnr_strength	int	3	Altref noise reduction filter strength Range: minimum 0.0; maximum 6.0.
rc_lookahead	int	25	Number of frames to look ahead for alternate reference frame selection Range: minimum 0.0; maximum 25.0.
qmin	int	4	Min video quantizer scale (VBR) Range: minimum -1.0; maximum 69.0.
qmax	int	48	Max video quantizer scale (VBR) Range: minimum -1.0; maximum 1024.0.
ts-parameters	string		Temporal scaling configuration using a :-separated list of key=value parameters
enable-tpl	option_fixed		Enable temporal dependency model (default auto) Supported values: `auto`, `false`, `true`.
min-gf-interval	int		Minimum golden/alternate reference frame interval (from -1 to INT_MAX) (default -1)
sharpness	int		Increase sharpness at the expense of lower PSNR (from -1 to 7) (default -1)

WMV8 (Windows Media Video 8, SW)

Configuration Parameter: wmv2

Additional attributes

Name	Type	Description
mpv_flags	flags	Flags common for all mpegvideo-based encoders. (default 0) Supported values: `skip_rd`, `strict_gop`, `qp_rd`, `cbp_rd`, `naq`, `mv0`. `skip_rd`: RD optimal MB level residual skipping `strict_gop`: Strictly enforce gop size `qp_rd`: Use rate distortion optimization for qp selection `cbp_rd`: use rate distortion optimization for CBP `naq`: normalize adaptive quantization `mv0`: always try a mb with mv=<0,0>
luma_elim_threshold	int	single coefficient elimination threshold for luminance (negative values also consider dc coefficient) (from INT_MIN to INT_MAX) (default 0)
chroma_elim_threshold	int	single coefficient elimination threshold for chrominance (negative values also consider dc coefficient) (from INT_MIN to INT_MAX) (default 0)
quantizer_noise_shaping	int	FFmpeg quantizer_noise_shaping option. (from 0 to INT_MAX) (default 0)
error_rate	int	Simulate errors in the bitstream to test error concealment. (from 0 to INT_MAX) (default 0)
qsquish	double	how to keep quantizer between qmin and qmax (0 = clip, 1 = use differentiable function) (from 0 to 99) (default 0)
rc_qmod_amp	double	experimental quantizer modulation (from -FLT_MAX to FLT_MAX) (default 0)
rc_qmod_freq	int	experimental quantizer modulation (from INT_MIN to INT_MAX) (default 0)
rc_eq	string	Set rate control equation. When computing the expression, besides the standard functions defined in the section 'Expression Evaluation', the following functions are available: bits2qp(bits), qp2bits(qp). Also the following constants are available: iTex pTex tex mv fCode iCount mcVar var isI isP isB avgQP qComp avgIITex avgPITex avgPPTex avgBPTex avgTex.
rc_init_cplx	double	initial complexity for 1-pass encoding (from -FLT_MAX to FLT_MAX) (default 0)
rc_buf_aggressivity	double	currently useless (from -FLT_MAX to FLT_MAX) (default 1)
border_mask	double	increase the quantizer for macroblocks close to borders (from -FLT_MAX to FLT_MAX) (default 0)
skip_threshold	int	Frame skip threshold (from INT_MIN to INT_MAX) (default 0)
skip_factor	int	Frame skip factor (from INT_MIN to INT_MAX) (default 0)
skip_exp	int	Frame skip exponent (from INT_MIN to INT_MAX) (default 0)
skip_cmp	option	Frame skip compare function (from INT_MIN to INT_MAX) (default dctmax) Supported values: `sad`, `sse`, `satd`, `dct`, `psnr`, `bit`, `rd`, `zero`, `vsad`, `vsse`, `nsse`, `dct264`, `dctmax`, `chroma`, `msad`. `sad`: 0: Sum of absolute differences, fast `sse`: 1: Sum of squared errors `satd`: 2: Sum of absolute Hadamard transformed differences `dct`: 3: Sum of absolute DCT transformed differences `psnr`: 4: Sum of squared quantization errors, low quality `bit`: 5: Number of bits needed for the block `rd`: 6: Rate distortion optimal, slow `zero`: 7: Zero `vsad`: 8: Sum of absolute vertical differences `vsse`: 9: Sum of squared vertical differences `nsse`: 10: Noise preserving sum of squared differences `dct264`: 14: dct264 `dctmax`: 13: dctmax `chroma`: 256: chroma `msad`: 15: Sum of absolute differences, median predicted
noise_reduction	int	Noise reduction (from INT_MIN to INT_MAX) (default 0)
ps	int	RTP payload size in bytes (from INT_MIN to INT_MAX) (default 0)
motion_est	option	motion estimation algorithm (from 0 to 2) (default epzs) Supported values: `zero`, `epzs`, `xone`. `zero`: 0: zero `epzs`: 1: epzs `xone`: 2: xone
mepc	int	Motion estimation bitrate penalty compensation (1.0 = 256) (from INT_MIN to INT_MAX) (default 256)
mepre	int	pre motion estimation (from INT_MIN to INT_MAX) (default 0)
intra_penalty	int	Penalty for intra blocks in block decision (from 0 to 1.07374e+09) (default 0)
lmin	int	minimum Lagrange factor (VBR) (from 0 to INT_MAX) (default 236)
lmax	int	maximum Lagrange factor (VBR) (from 0 to INT_MAX) (default 3658)
sc_threshold	int	Scene change threshold (from INT_MIN to INT_MAX) (default 0)

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Audio Codecs

General Audio Attributes

AAC (Advanced Audio Coding)

AC-3 (Dolby Digital, Fixed-Point)

AC-3 (Dolby Digital, Floating-Point)

ADPCM IMA QuickTime

ADPCM Microsoft

ALAC (Apple Lossless)

E-AC-3 (Dolby Digital Plus)

FLAC (Free Lossless)

MP2 (MPEG Audio Layer 2)

MP3 (LAME, MPEG Audio Layer 3)

Ogg Vorbis

Opus (libopus)

PCM 16-bit Signed LE

PCM 24-bit D-Cinema

PCM 24-bit Signed LE

PCM 32-bit Float LE

PCM 32-bit Signed LE

Video Codecs

General Video Attributes

Apple ProRes (iCodec Pro, SW)

Apple ProRes (Legacy, SW)

AV1 (FFmpeg VPL-MSDK, HW)

AV1 (NVIDIA NVENC, HW)

DNxHD (Avid, SW)

DPX (Digital Picture eXchange, SW)

DV / DVCPRO HD (SW)

FFV1 (Lossless, SW)

FLV / Sorenson Spark (H.263, SW)

H.264 AVC (AMD AMF, HW)

H.264 AVC (Cisco OpenH264, SW)

H.264 AVC (FFmpeg VPL-MSDK, HW)

H.264 AVC (Intel QuickSync, HW)

H.264 AVC (Intel QuickSync, SW)

H.264 AVC (libx264, SW)

H.264 AVC (NVIDIA NVENC Lossless, HW)

H.264 AVC (NVIDIA NVENC, HW)

H.265 HEVC (AMD AMF, HW)

H.265 HEVC (FFmpeg VPL-MSDK, HW)

H.265 HEVC (Intel QuickSync, HW)

H.265 HEVC (NVIDIA NVENC Lossless, HW)

H.265 HEVC (NVIDIA NVENC, HW)

H.265 HEVC (x265, SW)

H.266 VVC (Fraunhofer VVenC, SW)

Hap (Vidvox, SW)

HuffYUV (Lossless, SW)

Intel QuickSync H.264 Encoder

JPEG XS (SVT, SW)

MJPEG (Motion JPEG)

MPEG-1 Video (SW)

MPEG-2 Video (SW)

MPEG-4 Part 2 Video (ASP, SW)

OpenJPEG JPEG 2000

PNG (Image Sequence, SW)

QuickTime Animation (RLE, SW)

Uncompressed 4:2:2 10-bit (SW)

Uncompressed 4:2:2 8-bit (SW)

VP8 (Google, SW)

VP9 (Google, SW)

WMV8 (Windows Media Video 8, SW)

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