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ffmpeg -h encoder=h264_nvenc
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| Encoder h264_nvenc [NVIDIA NVENC H.264 encoder]: | |
| General capabilities: delay hardware | |
| Threading capabilities: none | |
| Supported pixel formats: yuv420p nv12 p010le yuv444p p016le yuv444p16le bgr0 rgb0 cuda d3d11 | |
| h264_nvenc AVOptions: | |
| -preset <int> E..V..... Set the encoding preset (from 0 to 11) (default medium) | |
| default E..V..... | |
| slow E..V..... hq 2 passes | |
| medium E..V..... hq 1 pass | |
| fast E..V..... hp 1 pass | |
| hp E..V..... | |
| hq E..V..... | |
| bd E..V..... | |
| ll E..V..... low latency | |
| llhq E..V..... low latency hq | |
| llhp E..V..... low latency hp | |
| lossless E..V..... | |
| losslesshp E..V..... | |
| -profile <int> E..V..... Set the encoding profile (from 0 to 3) (default main) | |
| baseline E..V..... | |
| main E..V..... | |
| high E..V..... | |
| high444p E..V..... | |
| -level <int> E..V..... Set the encoding level restriction (from 0 to 51) (default auto) | |
| auto E..V..... | |
| 1 E..V..... | |
| 1.0 E..V..... | |
| 1b E..V..... | |
| 1.0b E..V..... | |
| 1.1 E..V..... | |
| 1.2 E..V..... | |
| 1.3 E..V..... | |
| 2 E..V..... | |
| 2.0 E..V..... | |
| 2.1 E..V..... | |
| 2.2 E..V..... | |
| 3 E..V..... | |
| 3.0 E..V..... | |
| 3.1 E..V..... | |
| 3.2 E..V..... | |
| 4 E..V..... | |
| 4.0 E..V..... | |
| 4.1 E..V..... | |
| 4.2 E..V..... | |
| 5 E..V..... | |
| 5.0 E..V..... | |
| 5.1 E..V..... | |
| -rc <int> E..V..... Override the preset rate-control (from -1 to INT_MAX) (default -1) | |
| constqp E..V..... Constant QP mode | |
| vbr E..V..... Variable bitrate mode | |
| cbr E..V..... Constant bitrate mode | |
| vbr_minqp E..V..... Variable bitrate mode with MinQP (deprecated) | |
| ll_2pass_quality E..V..... Multi-pass optimized for image quality (deprecated) | |
| ll_2pass_size E..V..... Multi-pass optimized for constant frame size (deprecated) | |
| vbr_2pass E..V..... Multi-pass variable bitrate mode (deprecated) | |
| cbr_ld_hq E..V..... Constant bitrate low delay high quality mode | |
| cbr_hq E..V..... Constant bitrate high quality mode | |
| vbr_hq E..V..... Variable bitrate high quality mode | |
| -rc-lookahead <int> E..V..... Number of frames to look ahead for rate-control (from 0 to INT_MAX) (default 0) | |
| -surfaces <int> E..V..... Number of concurrent surfaces (from 0 to 64) (default 0) | |
| -cbr <boolean> E..V..... Use cbr encoding mode (default false) | |
| -2pass <boolean> E..V..... Use 2pass encoding mode (default auto) | |
| -gpu <int> E..V..... Selects which NVENC capable GPU to use. First GPU is 0, second is 1, and so on. (from -2 to INT_MAX) (default any) | |
| any E..V..... Pick the first device available | |
| list E..V..... List the available devices | |
| -delay <int> E..V..... Delay frame output by the given amount of frames (from 0 to INT_MAX) (default INT_MAX) | |
| -no-scenecut <boolean> E..V..... When lookahead is enabled, set this to 1 to disable adaptive I-frame insertion at scene cuts (default false) | |
| -forced-idr <boolean> E..V..... If forcing keyframes, force them as IDR frames. (default false) | |
| -b_adapt <boolean> E..V..... When lookahead is enabled, set this to 0 to disable adaptive B-frame decision (default true) | |
| -spatial-aq <boolean> E..V..... set to 1 to enable Spatial AQ (default false) | |
| -temporal-aq <boolean> E..V..... set to 1 to enable Temporal AQ (default false) | |
| -zerolatency <boolean> E..V..... Set 1 to indicate zero latency operation (no reordering delay) (default false) | |
| -nonref_p <boolean> E..V..... Set this to 1 to enable automatic insertion of non-reference P-frames (default false) | |
| -strict_gop <boolean> E..V..... Set 1 to minimize GOP-to-GOP rate fluctuations (default false) | |
| -aq-strength <int> E..V..... When Spatial AQ is enabled, this field is used to specify AQ strength. AQ strength scale is from 1 (low) - 15 (aggressive) (from 1 to 15) (default 8) | |
| -cq <float> E..V..... Set target quality level (0 to 51, 0 means automatic) for constant quality mode in VBR rate control (from 0 to 51) (default 0) | |
| -aud <boolean> E..V..... Use access unit delimiters (default false) | |
| -bluray-compat <boolean> E..V..... Bluray compatibility workarounds (default false) | |
| -init_qpP <int> E..V..... Initial QP value for P frame (from -1 to 51) (default -1) | |
| -init_qpB <int> E..V..... Initial QP value for B frame (from -1 to 51) (default -1) | |
| -init_qpI <int> E..V..... Initial QP value for I frame (from -1 to 51) (default -1) | |
| -qp <int> E..V..... Constant quantization parameter rate control method (from -1 to 51) (default -1) | |
| -weighted_pred <int> E..V..... Set 1 to enable weighted prediction (from 0 to 1) (default 0) | |
| -coder <int> E..V..... Coder type (from -1 to 2) (default default) | |
| default E..V..... | |
| auto E..V..... | |
| cabac E..V..... | |
| cavlc E..V..... | |
| ac E..V..... | |
| vlc E..V..... | |
| -b_ref_mode <int> E..V..... Use B frames as references (from 0 to 2) (default disabled) | |
| disabled E..V..... B frames will not be used for reference | |
| each E..V..... Each B frame will be used for reference | |
| middle E..V..... Only (number of B frames)/2 will be used for reference | |
| -a53cc <boolean> E..V..... Use A53 Closed Captions (if available) (default true) |
For absolute zero latency, you must also set a bitrate and set the buffer
size (-bufsize:v ) parameter to bitrate/fps.
Secondly, ensure you’re using an infinite GOP.
Try that and report back.
…On Thu, 12 Dec 2019 at 16:39, Jack-256 ***@***.***> wrote:
Hi, I just set the low latency parameters for the nvidia encoder on
ffmpeg, but it always delay with 2 frames, the parameters i set is
:av_opt_set(sys->codecEncoderContext, "preset", "llhq", 0);
av_opt_set(sys->codecEncoderContext, "rc", "cbr_ld_hq", 0);
av_opt_set(sys->codecEncoderContext, "tune", "zerolatency", 1);
is there any thing wrong ,
thanks a lot :)
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@Brainiarc7 Thanks for your response ! Should I set a constant bitrate, and how to set GOP to be infinite?
@Brainiarc7 It didn't work when I had set ""codecEncoderContext->gop_size = -1"" ""codecEncoderContext->rc_buffer_size = 40k/30"" I set the bitrate 40k, and framerate 30
@Brainiarc7 I try to set the rc_buffer_size 0, but after calling the avcodec_open2(), the rc_buffer_size was reset to 80k, the bitrate is 40k
@Brainiarc7 Maybe I should read source code of ffmpeg to figure out what is going on
On this: codecEncoderContext->rc_buffer_size = 40k/30
That should be a numeric, in float. The value should be 1333.33, not a fraction.
@Brainiarc7 , yeah, actual value is a numeric
@Jack-256 for zero latency, try:
:av_opt_set(sys->codecEncoderContext->delay = 0);Then retest and report back.
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Hi, I just set the low latency parameters for the nvidia encoder on ffmpeg, but it always delay with 2 frames, the parameters i set is :av_opt_set(sys->codecEncoderContext, "preset", "llhq", 0);
av_opt_set(sys->codecEncoderContext, "rc", "cbr_ld_hq", 0);
av_opt_set(sys->codecEncoderContext, "tune", "zerolatency", 1);
is there any thing wrong ,
thanks a lot :)