Audio Codecs
General Audio Attributes
used when no other attributes are specified
Additional attributes
| Name | Type | Default | Description |
|---|---|---|---|
| b | int | 128000 | Set audio bitrate (in bits/s). Support unit prefixes such as K |
AAC (Advanced Audio Coding)
Configuration Parameter: aac
Additional attributes
| Name | Type | Default | Description |
|---|---|---|---|
| stereo_mode | option_fixed | ms_off | Stereo coding method Selected by the EncoderDisable Mid/Side codingForce Mid/Side for the whole frame if possible |
| aac_coder | int | 1 | Set AAC encoder coding method. Possible values: 0 - twoloop, 1 - fast |
| profile | option_fixed | unknown | Profile of AAC coding. Possible values: unknown, aac_low, mpeg2_aac_low |
AC-3 (Dolby Digital, Fixed-Point)
Configuration Parameter: ac3_fixed
Additional attributes
| Name | Type | Default | Description |
|---|---|---|---|
| profile | option_fixed | unknown | AC3 profile. Possible values: unknown, dts, dts_es, dts_96_24, dts_hd_hra, dts_hd_ma |
| center_mixlev | double | 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 | |
| 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 | |
| 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 | |
| copyright | int | Copyright Bit. Specifies whether a copyright exists for this audio | |
| dsur_mode | option_fixed | Dolby Surround Mode Not Indicated (default)Dolby Surround EncodedNot Dolby Surround Encoded | |
| 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 | |
| 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 | |
| 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 | |
| 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 |
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 |
| 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 |
| 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 |
| 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 | |
| per_frame_metadata | Allow Changing Metadata Per-Frame. Specifies if the encoder should check for changing metadata for each frame | ||
| copyright | int | -1 | Copyright Bit. Specifies whether a copyright exists for this audio |
| 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 | |
| original | int | -1 | Original Bit Stream Indicator. Specifies whether this audio is from the original source and not a copy |
| 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 | |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 | |
| 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 | |
| ad_conv_type | option | A/D Converter Type. Indicates whether the audio has passed through HDCD A/D conversion Standard (default)HDCD | |
| stereo_rematrixing | 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 | ||
| 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 |
| 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 |
ADPCM IMA QuickTime
Configuration Parameter: adpcm_ima_qt
ADPCM Microsoft
Configuration Parameter: adpcm_ms
ALAC (Apple Lossless)
Configuration Parameter: alac
E-AC-3 (Dolby Digital Plus)
Configuration Parameter: eac3
Additional attributes
| Name | Type | Default | Description |
|---|---|---|---|
| profile | option_fixed | unknown | Profile name. Possible values: unknown, dts, dts_es, dts_96_24, dts_hd_hra, dts_hd_ma |
| mixing_level | int | -1 | Mixing Level |
| copyright | int | -1 | Copyright Bit. Specifies whether a copyright exists for this audio |
| dsur_mode | option_fixed | Dolby Surround Mode Not Indicated (default)Dolby Surround EncodedNot Dolby Surround Encoded | |
| 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 |
| 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 |
| 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 |
| 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 |
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 | |
| lpc_passes | int | -1 | Number of passes to use for Cholesky factorization during LPC analysis |
| min_partition_order | int | -1 | Minimal partition order |
| max_partition_order | int | -1 | Maximal partition order |
| prediction_order_method | option_fixed | Search method for selecting prediction order | |
| predm | Search method for selecting prediction order. Possible values: estimation, 2level, 4level, 8level, search, log | ||
| ch_mode | option_fixed | auto | Stereo decorrelation mode. Possible values: auto, indep, left_side, right_side, mid_side |
MP2 (MPEG Audio Layer 2)
Configuration Parameter: mp2
MP3 (LAME, MPEG Audio Layer 3)
Configuration Parameter: libmp3lame
Ogg Vorbis
Configuration Parameter: libvorbis
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
used when no other attributes are specified
Additional attributes
| Name | Type | Default | Description |
|---|---|---|---|
| b | int | 5M | Set video bitrate (in bits/s). Support unit prefixes such as K or M |
Apple ProRes (iCodec Pro, SW)
Configuration Parameter: prores_ks
Additional attributes
| Name | Type | Default | Description |
|---|---|---|---|
| mbs_per_slice | int | 8 | Macroblocks per slice |
| profile | option | auto | |
| vendor | string | Lavc | Vendor ID |
| bits_per_mb | int | 0 | Desired bits per macroblock |
| quant_mat | option | auto | Quantiser matrix |
| alpha_bits | int | 16 | Bits for alpha plane |
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 |
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 | |
| 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) |
| 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) |
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 | |
| rc_type | option_fixed | Auto | The rate control type |
| preset | option_fixed | default | Codec Preset - if specified, some properties below ignored |
| tuning_info | option_fixed | high_quality | Codec Tuning Info - if specified, some properties below ignored |
| level | option_fixed | Auto | Specifies the level of the encoded bitstream |
| tier | option_fixed | Main | |
| 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. | |
| ar_type | option_fixed | Type of video's aspect ratio | |
| 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 |
| outputAnnexBFormat | option_fixed | Set 'true' to use Annex B format for bitstream output | |
| enableTimingInfo | option_fixed | Set 'true' to write Timing Info into sequence/frame headers | |
| enableDecoderModelInfo | option_fixed | Set 'true' to write Decoder Model Info into sequence/frame headers. | |
| enableFrameIdNumbers | option_fixed | Set 'true' to write Frame id numbers in bitstream. | |
| disableSeqHdr | option_fixed | Set 'true' to disable Sequence Header signaling in the bitstream | |
| repeatSeqHdr | option_fixed | Set 'true' to output Sequence Header for every Key frame | |
| enableBitstreamPadding | option_fixed | Set 'true' to enable bitstream padding | |
| 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 | Specifies the 10 bit encoding mode |
| 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) |
CUDA H.264 Video Encoder
Configuration Parameter: c264
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 |
| maxrate | int | 6M | The maximum bit rate in bps is the peak bit rate used for VBR rate control |
| preset | option | Custom | Set the encoding parameters according to the presets required for supported encoding targets |
| size | string | Resolution of video. Format: WIDTHxHEIGHT | |
| g | int | 30 | This is the IDR period for H264 |
| bf | int | 1 | This sets the distance of one P picture from the previous P picture. e.g. for IBBPBBP, set the value as 3 |
| dynamic_gop | option_fixed | false | The GOP structure is determined dynamically by the encoder |
| profile | option_fixed | Main | Set the profile and level information |
| nal_type | int | 0 | Configures the NAL unit framing type |
| rc_type | option_fixed | vbr | The rate control type |
| qp_level_i | int | 28 | The QP level for intra pictures |
| qp_level_p | int | 28 | The QP level for inter P pictures |
| qp_level_b | int | 28 | The QP level for inter B pictures |
| deblock | option_fixed | true | Enable or disable de-blocking mode |
| disable_cabac | option_fixed | false | Enable or disable CABAC |
| disable_sps_pps | option_fixed | false | Enable or disable including sequence parameter set/picture parameter set ( SPS/PPS ) information in bitstream |
| deinterlace | option_fixed | Enable the deinterlace algorithm |
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 |
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 | Format for DV codec. Possible values: dvsd, dv25, dv50, dvhd. Note: x64 version support dvsd, dv25 only. |
FFV1 (Lossless, SW)
Configuration Parameter: ffv1
Additional attributes
| Name | Type | Default | Description |
|---|---|---|---|
| coder | option_fixed | 0 | 0 = Golomb-Rice, 1 = Range Coder, 2 = Range Coder (with custom state transition table) |
| context | option_fixed | 0 | 0 = small, 1 = large |
| g | int | 1 | GOP size. For archival use, GOP-size should be "1". |
| level | option_fixed | Version. Select which FFV1 version to use. | |
| 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. |
| 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. |
FLV / Sorenson Spark (H.263, SW)
Configuration Parameter: flv
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 |
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 |
| maxrate | int | Set max bitrate tolerance (in bits/s). | |
| bf | int | -1 | B Picture Pattern (from -1 to 3) |
| usage | option_fixed | Encoder Usage | |
| profile | option_fixed | Profile | |
| level | option_fixed | auto | Profile Level |
| latency | bool | Enables low latency mode | |
| quality | option_fixed | balanced | Set the encoding quality preset |
| rc | option_fixed | qvbr | Rate Control Method |
| 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 |
| 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 | |
| pa_scene_change_detection_enable | bool | Enable scene change detection | |
| pa_scene_change_detection_sensitivity | option_fixed | Set the sensitivity of scene change detection | |
| pa_static_scene_detection_enable | bool | Enable static scene detection | |
| pa_static_scene_detection_sensitivity | option_fixed | Set the sensitivity of static scene detection | |
| 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 | |
| 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 | |
| pa_taq_mode | option_fixed | Sets the temporal adaptive quantization mode | |
| pa_high_motion_quality_boost_mode | option_fixed | Sets the PA high motion quality boost mode | |
| 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 |
| 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 |
| slice_mode | option_fixed | auto | Set slice mode |
| loopfilter | int | 1 | Enable loop filter |
| max_nal_size | int | 0 | Set maximum NAL size in bytes |
| allow_skip_frames | Allow skipping frames to hit the target bitrate if set to 1 | ||
| flags | string | +global_header | Set global header in the bitstream |
| coder | option_fixed | cavlc | Set entropy encoder. Default value is cavlc |
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 | |
| 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 |
| 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 |
| dual_gfx | option_fixed | off | Prefer processing on both iGfx and dGfx simultaneously |
| 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 |
| int_ref_type | option | -1 | Intra refresh type. B frames should be set to 0. (from -1 to 65535) |
| 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) |
| 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 |
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 | Frames are stored in GPU memory |
| quality | string | 4 | Quality of captured video. Possible values: from 1 (fast capturing, minimal quality) to 7 (maximal quality, slow capturing) |
| g | int | 30 | This is the IDR period for H264 |
| profile | option_fixed | Auto | Set the profile |
| level | option_fixed | Auto | Sets the level flag in the output bitstream |
| rc_type | option_fixed | vbr | The rate control type |
| maxrate | int | The maximum bit rate in bps is the peak bit rate used for VBR rate control | |
| 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. | |
| initialdelay | int | 0 | Specifies the initial delay in bits. Set 0 to use the default initial delay |
| bf | int | This sets the distance of one P picture from the previous P picture. e.g. for IBBPBBP, set the value as 3 | |
| ref_frames | int | 0 | Number of reference frames; if NumRefFrame = 0, this parameter is not specified. |
| cavlc | option_fixed | false | Enable/disable Context-adaptive variable-length coding mode. |
| size | string | Resolution of video. Format: WIDTHxHEIGHT. | |
| icq_quality | int | Quality of intelligent constant quality algorithm. Possible values: from 1 (the best quality) to 51. | |
| accuracy | int | 100 | Determines quality of complex scenes in AVBR mode. |
| convergence | int | 0 | Determines quality of complex scenes in AVBR mode. |
| qpi | int | 22 | Determines quality in CQP mode. |
| qpb | int | 22 | Determines quality in CQP mode. |
| qpp | int | 22 | Determines quality in CQP mode. |
| force_gpu | int | 0 | Force Specified GPU device for encode (0 - first suitable HW device, 1..4 - Use specified HW device) |
| use_vpp | bool | false | Use Intel VPP for frame conversion and scaling |
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 | string | 1 | Quality of captured video. Possible values: from 1 (fast capturing, minimal quality) to 7 (maximal quality, slow capturing) |
| g | int | 30 | This is the IDR period for H264 |
| profile | option_fixed | Auto | Set the profile |
| level | option_fixed | Auto | Sets the level flag in the output bitstream |
| rc_type | option_fixed | vbr | The rate control type |
| maxrate | int | The maximum bit rate in bps is the peak bit rate used for VBR rate control | |
| bufsize | int | 0 | Set ratecontrol buffer size (in bits). Depends on the profile level of the video being encoded. Set only if you're encoding for a hardware device. |
| initialdelay | int | 0 | Specifies the initial delay in bits. Set 0 to use the default initial delay |
| bf | int | This sets the distance of one P picture from the previous P picture. e.g. for IBBPBBP, set the value as 3 | |
| ref_frames | int | Number of reference frames; if NumRefFrame = 0, this parameter is not specified. | |
| cavlc | option_fixed | false | Enable/disable Context-adaptive variable-length coding mode. |
| size | string | Resolution of video. Format: WIDTHxHEIGHT. | |
| icq_quality | int | Quality of intelligent constant quality algorithm. Possible values: from 1 (the best quality) to 51. | |
| accuracy | int | 100 | Determines quality of complex scenes in AVBR mode. |
| convergence | int | 0 | Determines quality of complex scenes in AVBR mode. |
| qpi | int | 22 | Determines quality in CQP mode. |
| qpb | int | 22 | Determines quality in CQP mode. |
| qpp | int | 22 | Determines quality in CQP mode. |
| use_vpp | bool | false | Use Intel VPP for frame conversion and scaling |
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 | |
| 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 | |
| crf | double | Select the quality for constant quality mode | |
| crf_max | double | In CRF mode, prevents VBV from lowering quality beyond this point | |
| qp | int | Constant quantization parameter rate control method | |
| aq-mode | option_fixed | AQ method | |
| aq_mode | Set adaptive quantization mode Variance AQ (complexity mask)Auto-variance AQ (experimental)Resolution of video. Format: WIDTHxHEIGHT.Aspect ratio of video.Type of video's aspect ratio | ||
| v422 | option_fixed | false | Indicates whether captioning used 4:2:2 chroma subsampling (4:2:0 overwise) |
| interlace | int | -1 | Interlacing: 1 - interlaced, 0 - progressive, -1 - auto |
| aq-strength | double | -1.0 | AQ strength. Reduces blocking and blurring in flat and textured areas |
| psy | int | -1 | Use psychovisual optimizations |
| psy-rd | string | Strength of psychovisual optimization, in <psy-rd>:<psy-trellis> format | |
| rc-lookahead | int | -1 | Number of frames to look ahead for frametype and ratecontrol |
| weightb | int | -1 | Weighted prediction for B-frames. |
| weightp | option_fixed | Weighted prediction analysis method | |
| ssim | int | Calculate and print SSIM stats | |
| intra-refresh | int | -1 | Use Periodic Intra Refresh instead of IDR frames |
| 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 | |
| b_pyramid | Strictly hierarchical pyramidNon-strict (not Blu-ray compatible) | ||
| mixed-refs | int | -1 | One reference per partition, as opposed to one reference per macroblock |
| fast-pskip | int | -1 | |
| aud | int | -1 | Use access unit delimiters. |
| mbtree | int | -1 | Use macroblock tree ratecontrol. |
| deblock | string | Loop filter parameters, in <alpha:beta> form. | |
| cplxblur | double | -1.000000 | Reduce fluctuations in QP (before curve compression) |
| partitions | string | A comma-separated list of partitions to consider. Possible values: p8x8, p4x4, b8x8, i8x8, i4x4, none, all | |
| direct-pred | option_fixed | Direct MV prediction mode | |
| slice-max-size | int | -1 | Limit the size of each slice in bytes |
| stats | string | Filename for 2 pass stats | |
| nal-hrd | option_fixed | Signal HRD information (requires vbv-bufsize; cbr not allowed in .mp4) |
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 |
| size | string | Resolution of video. Format: WIDTHxHEIGHT. | |
| ar | option | Aspect ratio of video. | |
| ar_type | option_fixed | Type of video's aspect ratio. | |
| disable_sps_pps | option_fixed | false | Disable writing of Sequence and Picture parameter for every IDR frame |
| outputBufferingPeriodSEI | option_fixed | true | Set 'true' to write SEI buffering period syntax in the bitstream |
| outputPictureTimingSEI | option_fixed | true | Set 'true' to write SEI picture timing syntax in the bitstream |
| outputFramePackingSEI | option_fixed | true | Set 'true' to enable writing of frame packing arrangement SEI messages to bitstream |
| outputRecoveryPointSEI | option_fixed | true | Set'true' to enable writing of recovery point SEI message |
| outputAUD | option_fixed | true | Set 'true' to write Access Unit Delimiter syntax. |
| output.444 | option_fixed | false | Enable or disable 444 encoding |
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 | |
| rc_type | option_fixed | Auto | The rate control type |
| preset | option_fixed | default | Codec Preset - if specified, some properties below ignored |
| tuning_info | option_fixed | high_quality | Codec Tuning Info - if specified, some properties below ignored |
| profile | option_fixed | Auto | Codec Profile |
| level | option_fixed | Auto | Sets the level flag in the output bitstream |
| maxrate | int | The maximum bit rate in bps is the peak bit rate used for VBR rate control | |
| size | string | Resolution of video. Format: WIDTHxHEIGHT | |
| ar | option | Aspect ratio of video | |
| ar_type | option_fixed | Type of video's aspect ratio. | |
| bufsize | int | 0 | Specifies the VBV(HRD) buffer size. in bits. Set 0 to use the default VBV buffer size |
| initialdelay | int | 0 | Specifies the VBV(HRD) initial delay in bits. Set 0 to use the default VBV initial delay |
| enableAQ | option_fixed | Set this to TRUE to enable adaptive quantization | |
| 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 |
| mvprecision | option_fixed | Auto | Specifies the desired motion vector prediction precision |
| disable_sps_pps | option_fixed | false | Disable writing of Sequence and Picture parameter for every IDR frame |
| separateColourPlaneFlag | option_fixed | false | Set 'true' to enable 4:4:4 separate colour planes |
| deblock | option_fixed | 1 | Specifies the deblocking filter mode |
| enableTemporalSVC | option_fixed | false | Set to 'true' to enable SVC temporal |
| hierarchicalPFrames | option_fixed | false | Set to 'true' to enable hierarchical PFrames |
| hierarchicalBFrames | option_fixed | false | Set to 'true' to enable hierarchical BFrames |
| outputBufferingPeriodSEI | option_fixed | true | Set 'true' to write SEI buffering period syntax in the bitstream |
| outputPictureTimingSEI | option_fixed | true | Set 'true' to write SEI picture timing syntax in the bitstream |
| outputFramePackingSEI | option_fixed | true | Set 'true' to enable writing of frame packing arrangement SEI messages to bitstream |
| outputRecoveryPointSEI | option_fixed | true | Set'true' to enable writing of recovery point SEI message |
| numTemporalLayers | int | Specifies max temporal layers to be used for hierarchical coding. Valid value range is [1,10] | |
| outputAUD | option_fixed | true | Set 'true' to write Access Unit Delimiter syntax |
| maxNumRefFrames | int | Specifies the DPB size used for encoding. Setting it to 0 will let driver use the default dpb size. The low latency application which wants to invalidate reference frame as an error resilience tool is recommended to use a large DPB size so that the encoder can keep old reference frames which can be used if recent | |
| ltrNumFrames | int | Specifies the maximum number of long term references can be used for prediction | |
| ltrTrustMode | option_fixed | Specifies the LTR operating mode. Set to 'false' to disallow encoding using LTR frames until later specified. Set to 'true' to allow encoding using LTR frames unless later invalidated | |
| enableConstrainedEncoding | option_fixed | Set this to 1 to enable constrainedFrame encoding where each slice in the constarined picture is independent of other slices | |
| adaptiveTransformMode | option_fixed | Enable the AdaptiveTransform Mode. | |
| fmoMode | option_fixed | Enable the FMO Mode. | |
| interlace | option_fixed | Auto | Interlace type |
| output.444 | option_fixed | false | Enable or disable 444 encoding |
| 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) |
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 |
| 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 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. | |
| usage | option_fixed | Encoder Usage | |
| bitdepth | option_fixed | Set color bit deph (8/10) | |
| profile | option_fixed | Set the profile | |
| profile_tier | option_fixed | Set the profile tier | |
| level | option_fixed | auto | Set the encoding level |
| quality | option_fixed | balanced | Set the encoding quality preset |
| latency | bool | Enables low latency mode | |
| rc | option_fixed | qvbr | Set the rate control mode |
| qvbr_quality_level | int | -1 | Sets the QVBR quality level (from -1 to 51) |
| header_insertion_mode | option_fixed | Set header insertion mode | |
| 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 | |
| pa_scene_change_detection_enable | bool | Enable scene change detection | |
| pa_scene_change_detection_sensitivity | option_fixed | Set the sensitivity of scene change detection | |
| pa_static_scene_detection_enable | bool | Enable static scene detection | |
| pa_static_scene_detection_sensitivity | option_fixed | Set the sensitivity of static scene detection | |
| 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 | |
| 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 | |
| pa_taq_mode | option_fixed | Sets the temporal adaptive quantization mode | |
| pa_high_motion_quality_boost_mode | option_fixed | Sets the PA high motion quality boost mode |
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 | |
| 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 |
| 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 |
| dual_gfx | option_fixed | off | Prefer processing on both iGfx and dGfx simultaneously |
| idr_interval | option | 0 | Distance (in I-frames) between IDR frames (from -1 to INT_MAX) |
| load_plugins | option_fixed | hevc_hw | A user plugin to load in an internal session (from 0 to 2) |
| 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) |
| tier | option | high | Set the encoding tier (only level >= 4 can support high tier) (from 0 to 256) |
| 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) |
| 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) |
H.265 HEVC (Intel QuickSync, HW)
Configuration Parameter: q265hw
Additional attributes
| Name | Type | Default | Description |
|---|---|---|---|
| rc_type | option_fixed | vbr | The rate control type |
| bf | int | This sets the distance of one P picture from the previous P picture. e.g. for IBBPBBP, set the value as 3 | |
| async_depth | int | 4 | Maximum processing parallelism |
| avbr_accuracy | int | 0 | Accuracy of the AVBR ratecontrol |
| avbr_convergence | int | 0 | Convergence of the AVBR ratecontrol |
| preset | option | medium | |
| vcm | int | 0 | Use the video conferencing mode ratecontrol |
| rdo | int | -1 | Enable rate distortion optimization |
| max_frame_size | int | -1 | Maximum encoded frame size in bytes |
| max_slice_size | int | -1 | Maximum encoded slice size in bytes |
| bitrate_limit | int | -1 | Toggle bitrate limitations |
| mbbrc | int | -1 | MB level bitrate control |
| extbrc | int | -1 | Extended bitrate control |
| adaptive_i | int | -1 | Adaptive I-frame placement |
| adaptive_b | int | -1 | Adaptive B-frame placement |
| b_strategy | int | -1 | Strategy to choose between I/P/B-frames |
| idr_interval | option | Distance (in I-frames) between IDR frames Output an IDR-frame only at the beginning of the stream | |
| load_plugin | option | hevc_hw | A user plugin to load in an internal session |
| load_plugins | string | A :-separate list of hexadecimal plugin UIDs to load in an internal session | |
| profile | option | unknown |
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 |
| size | string | Resolution of video. Format: WIDTHxHEIGHT. | |
| ar | option | Aspect ratio of video | |
| ar_type | option_fixed | Type of video's aspect ratio. | |
| disable_sps_pps | option_fixed | false | Disable writing of Sequence and Picture parameter for every IDR frame |
| outputBufferingPeriodSEI | option_fixed | true | Set 'true' to write SEI buffering period syntax in the bitstream |
| outputPictureTimingSEI | option_fixed | true | Set 'true' to write SEI picture timing syntax in the bitstream |
| outputAUD | option_fixed | true | Set 'true' to write Access Unit Delimiter syntax |
| output.10bit | option_fixed | false | Specifies the 10 bit encoding mode |
| output.444 | option_fixed | false | Enable or disable 444 encoding |
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 | |
| rc_type | option_fixed | Auto | The rate control type |
| preset | option_fixed | default | Codec Preset - if specified, some properties below ignored |
| tuning_info | option_fixed | high_quality | Codec Tuning Info - if specified, some properties below ignored |
| level | option_fixed | Auto | Specifies the level of the encoded bitstream. |
| tier | option_fixed | Main | |
| 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. | |
| ar_type | option_fixed | Type of video's aspect ratio. | |
| 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 |
| intraRefreshPeriod | int | 0 | Specifies the interval between successive intra refresh if intraRefreshCount is set |
| intraRefreshCount | int | 0 | Specifies the length of intra refresh in number of frames for periodic intra refresh. This value should be smaller than intraRefreshPeriod |
| mvprecision | option_fixed | Auto | Specifies the desired motion vector prediction precision |
| disable_sps_pps | option_fixed | false | Disable writing of Sequence and Picture parameter for every IDR frame |
| deblock | option_fixed | true | Set 'true' to enable in loop filtering across slice boundary. |
| useConstrainedIntraPred | option_fixed | Set 'true' to enable constrained intra prediction. | |
| outputBufferingPeriodSEI | option_fixed | true | Set 'true' to write SEI buffering period syntax in the bitstream |
| outputPictureTimingSEI | option_fixed | true | Set 'true' to write SEI picture timing syntax in the bitstream |
| outputAUD | option_fixed | true | Set 'true' to write Access Unit Delimiter syntax |
| enableLTR | option_fixed | Set 'true' to enable use of long term reference pictures for inter prediction | |
| maxNumRefFramesInDPB | int | Specifies the maximum number of references frames in the DPB | |
| ltrNumFrames | int | Specifies the maximum number of long term references can be used for prediction | |
| maxTemporalLayersMinus1 | int | Specifies the max temporal layer used for hierarchical coding. | |
| output.10bit | option_fixed | false | Specifies the 10 bit encoding mode |
| output.444 | option_fixed | false | Enable or disable 444 encoding |
| 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) |
H.265 HEVC (x265, SW)
Configuration Parameter: libx265
Additional attributes
| Name | Type | Default | Description |
|---|---|---|---|
| preset | option | superfast | Set the x265 preset. |
| tune | option | Set the x265 tune parameter. Possible values: psnr (disables adaptive quant, psy-rd, and cutree), ssim (enables adaptive quant auto-mode, disables psy-rd), grain (improves retention of film grain), fastdecode (no loop filters, no weighted pred, no intra in B), zerolatency (no lookahead, no B frames, no cutree). | |
| forced-idr | int | 0 | Normally, when forcing a I-frame type, the encoder can select any type of I-frame. This option forces it to choose an IDR-frame. |
| x265-params | string | Set x265 options using a list of key=value couples separated by ":". See x265 help for a list of options. |
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 | |
| qp | int | Set quantization | |
| period | int | Set (intra) refresh period in seconds | |
| 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 |
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) |
| chunks | int | 1 | Chunk count |
| compressor | option | snappy | Second-stage compressor NoneSnappy |
HuffYUV (Lossless, SW)
Configuration Parameter: huffyuv
Intel QuickSync H.264 Encoder
Configuration Parameter: q264
Additional attributes
| Name | Type | Default | Description |
|---|---|---|---|
| b | int | 5M | The average bit rate in bps is the target bit rate used for VBR rate control |
| quality | string | Quality of captured video. Possible values: from 1 (fast capturing, minimal quality) to 7 (maximal quality, slow capturing) | |
| g | int | 30 | This is the IDR period for H264 |
| profile | option_fixed | Auto | Set the profile |
| level | option_fixed | Auto | Sets the level flag in the output bitstream |
| rc_type | option_fixed | vbr | The rate control type |
| maxrate | int | The maximum bit rate in bps is the peak bit rate used for VBR rate control | |
| 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. | |
| initialdelay | int | 0 | Specifies the initial delay in bits. Set 0 to use the default initial delay |
| bf | int | This sets the distance of one P picture from the previous P picture. e.g. for IBBPBBP, set the value as 3 | |
| ref_frames | int | Number of reference frames; if NumRefFrame = 0, this parameter is not specified. | |
| cavlc | option_fixed | false | Enable/disable Context-adaptive variable-length coding mode. |
| size | string | Resolution of video. Format: WIDTHxHEIGHT. | |
| icq_quality | int | Quality of intelligent constant quality algorithm. Possible values: from 1 (the best quality) to 51. | |
| accuracy | int | 100 | Determines quality of complex scenes in AVBR mode. |
| convergence | int | 0 | Determines quality of complex scenes in AVBR mode. |
| qpi | int | 22 | Determines quality in CQP mode. |
| qpb | int | 22 | Determines quality in CQP mode. |
| qpp | int | 22 | Determines quality in CQP mode. |
| force_gpu | int | -2 | Force Specified GPU encoder (0 - HW mode (first suitable HW device), -1 - SW mode, -2 - Auto HW/SW mode, 1..4 - Use specified HW device) |
| use_vpp | bool | false | Use Intel VPP for frame conversion and scaling |
JPEG XS (SVT, SW)
Configuration Parameter: libsvtjpegxs
Additional attributes
| Name | Type | Default | Description |
|---|---|---|---|
| bpp | int | 2 | Bits per pixel |
| slice_height | int | Specify number of lines calculated in one thread | |
| decomp_v | int | vertical decomposition level | |
| decomp_h | int | horizontal decomposition level | |
| quantization | int | Quantization algorithm: deadzone:0, uniform:1 | |
| coding-signs | int | Enable Signs handling strategy: disable:0, fast:1, full:2 | |
| coding-sigf | int | Enable Significance coding | |
| coding-vpred | int | Enable Vertical Prediction coding: disable:0, zero prediction residuals:1, zero coefficients: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) |
MPEG-1 Video (SW)
Configuration Parameter: mpeg1video
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 |
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 | |
| gop_timecode | string | GOP timecode value | |
| v422 | option_fixed | false | Indicates whether captioning used 4:2:2 chroma subsampling (4:2:0 overwise). |
| interlace | int | -1 | Interlacing: 1 - interlaced, 0 - progressive, -1 - auto. |
MPEG-4 Part 2 Video (ASP, SW)
Configuration Parameter: mpeg4
Additional attributes
| Name | Type | Default | Description |
|---|---|---|---|
| data_partitioning | int | 0 | Use data partitioning. |
| mpv_flags | flags | Flags common for all mpegvideo-based encoders. RD optimal MB level residual skippingStrictly enforce GOP sizeUse rate distortion optimization for qp selectionuse rate distortion optimization for CBP | |
| interlace | int | -1 | Interlacing: 1 - interlaced, 0 - progressive, -1 - auto. |
OpenJPEG JPEG 2000
Configuration Parameter: libopenjpeg
Additional attributes
| Name | Type | Default | Description |
|---|---|---|---|
| format | option_fixed | jp2 | Codec Format. Possible values: j2k, jp2. |
| profile | option_fixed | jpeg2000 | Profile name. Possible values: jpeg2000, cinema2k, cinema4k. |
| cinema_mode | option_fixed | off | Digital Cinema mode. Possible values: off, 2k_24, 2k_48, 4k_24 |
| numresolution | int | 6 | Number of resolutions |
| numlayers | int | 1 | Number of layers |
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
VC-1
Configuration Parameter: vc1
VP8 (Google, SW)
Configuration Parameter: libvpx
Additional attributes
| Name | Type | Default | Description |
|---|---|---|---|
| cpu-used | int | 3 | Quality/Speed ratio modifier |
| quality | int | 1000000 | Encoding quality |
| max-intra-rate | int | -1 | Maximum I-frame bitrate (pct) 0=unlimited |
| er | 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. | ||
| speed | int | 3 | Encoding speed |
| crf | int | -1 | Select the quality for constant quality mode |
| frame-parallel | 1 | Enable frame parallel decodability features | |
| lag-in-frames | int | 4 | Number of frames to look ahead for alternate reference frame selection |
| auto-alt-ref | int | -1 | Enable use of alternate reference frames (2-pass only) |
| qmin | int | 4 | Min video quantizer scale (VBR) |
| qmax | int | 48 | Max video quantizer scale (VBR) |
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) |
| lag-in-frames | int | 4 | Number of frames to look ahead for alternate reference frame selection |
| arnr-maxframes | int | 0 | altref noise reduction max frame count |
| arnr-strength | int | 3 | altref noise reduction filter strength |
| arnr-type | option | centered | altref noise reduction filter type |
| arnr_type | int | 3 | altref noise reduction filter type |
| tune | option | Tune the encoding to a specific scenario | |
| deadline | option | good | Time to spend encoding, in microseconds |
| quality | int | realtime | |
| error-resilient | flags | Error resilience configuration | |
| max-intra-rate | int | -1 | Maximum I-frame bitrate (pct) 0=unlimited |
| er | 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. | ||
| crf | int | 10 | Select the quality for constant quality mode |
| static-thresh | int | 0 | A change threshold on blocks below which they will be skipped by the encoder |
| drop-threshold | int | 0 | Frame drop threshold |
| noise-sensitivity | int | 0 | Noise sensitivity |
| undershoot-pct | int | -1 | Datarate undershoot (min) target (%) |
| overshoot-pct | int | -1 | Datarate overshoot (max) target (%) |
| cpu-used | int | 4 | Quality/Speed ratio modifier |
| lossless | int | -1 | Lossless mode |
| tile-columns | int | 2 | Number of tile columns to use, log2 |
| tile-rows | int | -1 | Number of tile rows to use, log2 |
| frame-parallel | 1 | Enable frame parallel decodability features | |
| aq-mode | option | Adaptive quantization mode | |
| aq_mode | Aq not usedVariance based AqComplexity based AqCyclic Refresh Aq360 video Aq | ||
| level | double | -1.000000 | Specify level |
| row-mt | 1 | Row based multi-threading | |
| tune-content | option | Tune content type | |
| tune_content | Regular video contentScreen capture contentFilm content; improves grain retention | ||
| corpus-complexity | int | -1 | Corpus vbr complexity midpoint |
| speed | int | 5 | Encoding speed |
| vp8flags | flags | ||
| flags | Enable error resilienceEnable use of alternate reference frames (VP8/2-pass only) | ||
| arnr_max_frames | int | 0 | Altref noise reduction max frame count |
| arnr_strength | int | 3 | Altref noise reduction filter strength |
| rc_lookahead | int | 25 | Number of frames to look ahead for alternate reference frame selection |
| qmin | int | 4 | Min video quantizer scale (VBR) |
| qmax | int | 48 | Max video quantizer scale (VBR) |
WMV8 (Windows Media Video 8, SW)
Configuration Parameter: wmv2
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