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NVIDIA GPU acceleration for transcoding


Paweł K.

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I'm trying to figure out how to configure ffmpegprefs.ini to use GPU of nvidia card to transcode stream

I've modify ffmpegprefs.ini according to wiki HWAccelIntro,  unfortunately streaming not working

 

As a client I'm using Kodi 17,3

 

[TS HD 3600 kbit]
Cmd=-analyzeduration {analyzeduration} {offset} {realtime} -i "{infile}" -f mpegts -pat_period 0.2 -hwaccel cuvid -c:v h264_cuvid -bufsize 6400k -maxrate 3200k -crf 20 -g 50 {framerate} -map 0:v:0 -map 0:a:0 -vf "yadif=0:-1:1, scale={scalex}:{scaley}" -preset {vpreset} -tune film -vprofile main -level 30 -acodec libmp3lame -ab 128k -ar 44100 -ac 2 -async 1 -y "{outfile}"
maxWidth=1280
maxHeight=720
MimeType=video/mpeg
Ext=.ts
Delay=2000

Anyone have idea how to modify ffmpegprefs.ini to use GPU to transcoding ?

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  • 1 month later...

Don't use the -hwaccel option !

Use the -c:v h264_nvenc codec for NVIDIA GPU encoding ...

The command line syntax for the codec are as follows :

Encoder h264_nvenc [NVIDIA NVENC H.264 encoder]:
    General capabilities: delay 
    Threading capabilities: none
    Supported pixel formats: yuv420p nv12 p010le yuv444p 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.... 

well, don't ask me for details.

Here is no NVIDA GPU on my systems ...

 

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you may have to test this commandline :

(if does not work, use the software decoding -> remove "-hwaccel cuvid -c:v h264_cuvid" from the command line

 

 

[TS HD 3600 kbit]
Cmd=-analyzeduration {analyzeduration} {offset} {realtime} -hwaccel cuvid -c:v h264_cuvid -i "{infile}" -f mpegts -pat_period 0.2 -c:v h264_nvenc -bufsize 6400k -maxrate 3200k -crf 20 -g 50 {framerate} -map 0:v:0 -map 0:a:0 -vf "yadif=0:-1:1, scale={scalex}:{scaley}" -preset {vpreset} -tune film -vprofile main -level 30 -acodec libmp3lame -ab 128k -ar 44100 -ac 2 -async 1 -y "{outfile}"
maxWidth=1280
maxHeight=720
MimeType=video/mpeg
Ext=.ts
Delay=2000
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  • 3 weeks later...

Hi.

1. If it possible to add {IF} {End If} statement in "Cmd=" line of  ffmpegprefs.ini file? as it done in Tasks (to generate mkv).

To get full HW transcode on NVIDIA GPU, I use two separate lines, one is for H264 sourse dvb TS stream, second is for MPEG2 source dvb TS stream:

[TS H264 HD 3600 kbit]
Cmd=-analyzeduration {analyzeduration} {offset} {realtime} -hwaccel cuvid -c:v h264_cuvid -dent 2 -drop_second_field 1 -i "{infile}" -f mpegts -pat_period 0.2 -c:v h264_nvenc -bufsize 6400k -maxrate 3200k -rc vbr_hq -cq 1 -g 50 {framerate} -map 0:v:0 -map 0:a:0 -preset slow -vprofile high -level 30 -acodec libmp3lame -ab 128k -ar 44100 -ac 2 -async 1 -y "{outfile}"
maxWidth=1280
maxHeight=720
MimeType=video/mpeg
Ext=.ts

 

[TS MPEG2 HD 3600 kbit]
Cmd=-analyzeduration {analyzeduration} {offset} {realtime} -hwaccel cuvid -c:v mpeg2_cuvid -dent 2 -drop_second_field 1 -i "{infile}" -f mpegts -pat_period 0.2 -c:v h264_nvenc -bufsize 6400k -maxrate 3200k -rc vbr_hq -cq 1 -g 50 {framerate} -map 0:v:0 -map 0:a:0 -preset slow -vprofile high -level 30 -acodec libmp3lame -ab 128k -ar 44100 -ac 2 -async 1 -y "{outfile}"
maxWidth=1280
maxHeight=720
MimeType=video/mpeg
Ext=.ts

2. Where I can change -preset {vpreset} list? veryfast, ultrafast, placebo ...etc, are not available for h264_nvenc, but this API encoder has their own preset list: slow, medium, hq, llhq ...etc.

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4 hours ago, yakov2905 said:

If it possible to add {IF} {End If} statement in "Cmd=" line of  ffmpegprefs.ini file?

 

No. Only conditions supported by FFmpeg are available in the commandline.

 

4 hours ago, yakov2905 said:

Where I can change -preset {vpreset} list?

 

It is not configurable.

 

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  • 7 months later...

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