[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 bmegli):

 Ok! I already have some workflows with vaapi_scale before encoding so
 testing it should be rather simple.

 If this change of behavior in FFMpeg was intentional the ticket should
 probably end up closed with "wontfix"

 From what I remember 4.x accepts 4:2:0 chroma formats other than nv12
 (e.g. yuv420p) so there may be required some user code logic when to
 invoke vaapi_scale with nv12 conversion.

 I am going to test it (but not soon) and leave some final feedback.

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Ticket URL: <https://trac.ffmpeg.org/ticket/8902#comment:7>
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