[FFmpeg-trac] #8902(avcodec:new): VAAPI pixel format support regression between FFmpeg 3.x and 4.x

[FFmpeg]

#8902: VAAPI pixel format support regression between FFmpeg 3.x and 4.x
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             Reporter:  bmegli       |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:  avcodec
              Version:  git-master   |               Resolution:
             Keywords:  vaapi        |               Blocked By:
  regression                         |
             Blocking:               |  Reproduced by developer:  1
Analyzed by developer:  0            |
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Comment (by wenbinCHEN):

 Replying to [comment:5 bmegli]:
 >
 > 1. Do you know if libva conversions are hardware or software?
 >
 sorry, I don't know how it does the conversion in 3.x version, but libva
 can do conversion in hardware.

 I tried the "hwupload" and found that it only upload frames to hardware,
 so you may append "vaapi_scale=format=nv12" filter to do the conversion.

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Ticket URL: <https://trac.ffmpeg.org/ticket/8902#comment:6>
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