https://obsproject.com/kb/advanced-nvenc-options
Advanced NVENC Options (31.0) | OBS
Advanced NVENC Options (31.0) 2024-08-21 Starting with OBS 31.0 the NVENC implemenation provides additional options for adjusting the NVIDIA encoder settings. New Properties Rate Control: Variable Bitrate with Target Quality New mode behaving similarly to
obsproject.com
OptionDescription
| keyint | Note: Not a standard NVENC option. Keyframe interval in frames, supports special value of 1 for intra-only mode. |
| frameIntervalP | Specifies the GOP pattern as follows:
|
| gopLength | Note: Except for the special case of infinite GOP, keyint should be used instead. Specifies the number of pictures in one GOP. Low latency application client can set goplength to NVENC_INFINITE_GOPLENGTH (4294967295) so that keyframes are not inserted automatically. |
Rate Control Options
OptionDescription
| constQP=<N>/constQP=<I>:<P>:<B> | Specifies the initial QP to be used for encoding, these values would be used for all frames if in Constant QP mode. |
| minQP=<N>/minQP=<I>:<P>:<B> | Specifies the minimum QP used for rate control. Also requires enableMinQP=1 to be set. |
| maxQP=<N>/maxQP=<I>:<P>:<B> | Specifies the maximum QP used for rate control. Also requires enableMaxQP=1 to be set. |
| initialRCQP=<N>/initialRCQP=<I>:<P>:<B> | Specifies the initial QP hint used for rate control. The parameter is just used as hint to influence the QP difference between I,P and B frames. Also requires enableInitialRCQP=1 to be set. |
| averageBitRate | Specifies the average bitrate(in bits/sec) used for encoding. |
| maxBitRate | Specifies the maximum bitrate for the encoded output. This is used for VBR and ignored for CBR mode. |
| vbvBufferSize | Specifies the VBV(HRD) buffer size. in bits. Set 0 to use the default VBV buffer size. |
| vbvInitialDelay | Specifies the VBV(HRD) initial delay in bits. Set 0 to use the default VBV initial delay. |
| targetQuality | Target CQ (Constant Quality) level for VBR mode (range 0-51 with 0-automatic). |
| enableLookahead | Set this to 1 to enable lookahead. |
| disableIadapt | Set this to 1 to disable adaptive I-frame insertion at scene cuts (only has an effect when lookahead is enabled) |
| disableBadapt | Set this to 1 to disable adaptive B-frame decision (only has an effect when lookahead is enabled) |
| enableAQ | Set this to 1 to enable adaptive quantization (Spatial). |
| enableTemporalAQ | Set this to 1 to enable temporal AQ. |
| aqStrength | When AQ (Spatial) is enabled, this field is used to specify AQ strength. AQ strength scale is from 1 (low) - 15 (aggressive). If not set, strength is auto selected by driver. |
| lookaheadLevel | Specifies the lookahead level. Higher level may improve quality at the expense of performance. |
| lookaheadDepth | Maximum depth of lookahead with range 0-(31 - number of B frames). |
H.264 Options
OptionDescription
| level | Specifies the encoding level. Client is recommended to set this to NV_ENC_LEVEL_AUTOSELECT (0) in order to enable the NVENC interface to select the correct level. Can be specified as a decimal number, e.g. 4.2 |
| useBFramesAsRef | Specifies the B-Frame as reference mode. |
| enableFillerDataInsertion | Set to 1 to enable insertion of filler data in the bitstream. This flag will take effect only when CBR rate control mode is in use |
HEVC Options
OptionsDescription
| level | Specifies the level of the encoded bitstream. Can be specified as a decimal number, e.g. 4.2 |
| tier | Specifies the level tier of the encoded bitstream. |
| useBFramesAsRef | Specifies the B-Frame as reference mode. |
| tfLevel | Specifies the strength of the temporal filtering. Temporal filter feature is supported only if frameIntervalP >= 5. Temporal filter is recommended for natural contents. |
| enableFillerDataInsertion | Set to 1 to enable insertion of filler data in the bitstream. This flag will take effect only when CBR rate control mode is in use |
AV1 Options
OptionDescription
| level | Specifies the level of the encoded bitstream. |
| tier | Specifies the level tier of the encoded bitstream. |
| numTileColumns | This parameter specifies the way in which the picture is divided into tile columns. 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. Note: A larger amount of tiles can help with decoding speed. By default, OBS sets this to 2 for resolutions of 2160p or above. |
| numTileRows | This parameter specifies the way in which the picture is divided into tiles rows. 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. Note: A larger amount of tiles can help with decoding speed. |
| useBFramesAsRef | Specifies the B-Frame as reference mode. |
| enableBitstreamPadding | Set 1 to enable bitstream padding. |
NVENC Video Encoder API Programming Guide - NVIDIA Docs
NVIDIA® GPUs based on NVIDIA Kepler™ and later GPU architectures contain a hardware-based H.264/HEVC/AV1 video encoder (hereafter referred to as NVENC). The NVENC hardware takes YUV/RGB as input and generates an H.264/HEVC/AV1 compliant video bit stream
docs.nvidia.com