[FFmpeg-user] Trouble selecting a pixel format/colorspace while trying to encode a video using ffmpeg and HW accelerated vaapi or qsv interfaces

[Chen, Wenbin]

> > Output of 'ffmpeg -h filter=vpp_qsv' is bellow
> >
> > ====
> > Filter vpp_qsv
> >   Quick Sync Video VPP.
> >     Inputs:
> >        #0: default (video)
> >     Outputs:
> >        #0: default (video)
> > vpp_qsv AVOptions:
> >    deinterlace       <int>        ..FV....... deinterlace mode: 0=off, 1=bob,
> > 2=advanced (from 0 to 2) (default 0)
> >      bob             1            ..FV....... Bob deinterlace mode.
> >      advanced        2            ..FV....... Advanced deinterlace mode.
> >    denoise           <int>        ..FV....... denoise level [0, 100] (from 0
> > to 100) (default 0)
> >    detail            <int>        ..FV....... enhancement level [0, 100] (from
> > 0 to 100) (default 0)
> >    framerate         <rational>   ..FV....... output framerate (from 0 to
> > DBL_MAX) (default 0/1)
> >    procamp           <int>        ..FV....... Enable ProcAmp (from 0 to 1)
> > (default 0)
> >    hue               <float>      ..FV....... ProcAmp hue (from -180 to 180)
> > (default 0)
> >    saturation        <float>      ..FV....... ProcAmp saturation (from 0 to
> > 10) (default 1)
> >    contrast          <float>      ..FV....... ProcAmp contrast (from 0 to 10)
> > (default 1)
> >    brightness        <float>      ..FV....... ProcAmp brightness (from -100 to
> > 100) (default 0)
> >    transpose         <int>        ..FV....... set transpose direction (from -1
> > to 6) (default -1)
> >      cclock_hflip    0            ..FV....... rotate counter-clockwise with
> > horizontal flip
> >      clock           1            ..FV....... rotate clockwise
> >      cclock          2            ..FV....... rotate counter-clockwise
> >      clock_hflip     3            ..FV....... rotate clockwise with horizontal
> > flip
> >      reversal        4            ..FV....... rotate by half-turn
> >      hflip           5            ..FV....... flip horizontally
> >      vflip           6            ..FV....... flip vertically
> >    cw                <string>     ..FV....... set the width crop area
> > expression (default "iw")
> >    ch                <string>     ..FV....... set the height crop area
> > expression (default "ih")
> >    cx                <string>     ..FV....... set the x crop area expression
> > (default "(in_w-out_w)/2")
> >    cy                <string>     ..FV....... set the y crop area expression
> > (default "(in_h-out_h)/2")
> >    w                 <string>     ..FV....... Output video width (default
> > "cw")
> >    width             <string>     ..FV....... Output video width (default
> > "cw")
> >    h                 <string>     ..FV....... Output video height (default
> > "w*ch/cw")
> >    height            <string>     ..FV....... Output video height (default
> > "w*ch/cw")
> >    format            <string>     ..FV....... Output pixel format (default
> > "same")
> >    async_depth       <int>        ..FV....... Internal parallelization depth,
> > the higher the value the higher the latency. (from 0 to INT_MAX) (default 0)
> >    scale_mode        <int>        ..FV....... scale mode: 0=auto, 1=low power,
> > 2=high quality (from 0 to 2) (default 0)
> > ====
> >
> > I tried the following command with vpp_qsv filter but pixel
> format/colorspace
> > of the output is the same:
> >
> > ====
> > ffmpeg -init_hw_device qsv=hw -filter_hw_device hw -v verbose -f x11grab
> > -draw_mouse 0 -framerate 20 -probesize 42M -video_size 1920x1200
> > -thread_queue_size 1000 -vcodec rawvideo -i ":0.0" -an -vf
> > 'hwupload=extra_hw_frames=64,vpp_qsv=format=bgra' -c:v hevc_qsv -
> preset
> > veryslow -global_quality 17 -look_ahead 1 -y /tmp/output.mkv
> > ====
> >
> > The ffprobe result for the above command is:
> >
> > ====
> > Input #0, matroska,webm, from '/tmp/output.mkv':
> >   Metadata:
> >     ENCODER         : Lavf59.27.100
> >   Duration: 00:00:04.85, start: 0.000000, bitrate: 50 kb/s
> >   Stream #0:0: Video: hevc (Main), yuvj420p(pc, gbr/unknown/unknown,
> > progressive), 1920x1200 [SAR 1:1 DAR 8:5], 20 fps, 20 tbr, 1k tbn
> >     Metadata:
> >       ENCODER         : Lavc59.37.100 hevc_qsv
> >       DURATION        : 00:00:04.850000000
> > ====
> >
> > On Thu, 8 Dec 2022 at 17:06, Dennis Mungai <dmngaie at gmail.com> wrote:

In case of RGB input, VPL/MSDK uses 420 chroma format as default for the purpose of backward compatibility.
I will send patch to enable 444 encoding for RGB input, then you can get the same output as libx265 SW.

Thanks
Wenbin

> >
> > > Hey there,
> > >
> > > I'd recommend using the vpp_qsv filter instead.
> > >
> > > Please provide the output of:
> > >
> > > ffmpeg -h filter=vpp_qsv
> > >
> > > And I'll generate a command line you can use to test and report back.
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