[FFmpeg-trac] #9167(swscale:open): Swascale matrix is not autopropogated for types of YCbCr

[FFmpeg]

#9167: Swascale matrix is not autopropogated for types of YCbCr
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             Reporter:  kvsico      |                    Owner:  jeeb
                 Type:  defect      |                   Status:  open
             Priority:  critical    |                Component:  swscale
              Version:  git-master  |               Resolution:
             Keywords:              |               Blocked By:
             Blocking:              |  Reproduced by developer:  1
Analyzed by developer:  1           |
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Changes (by Balling):

 * owner:  (none) => jeeb

Comment:

 So essentially the bug happens here
 https://github.com/FFmpeg/FFmpeg/commit/37f4aa133d0a0daa04661f65a016451525df7d0f

 That fixme was deleted without actually fixing it
 https://github.com/k4yt3x/video2x/issues/403#issuecomment-1013705656

 Jan, FYI, will assign you. Also note that openh264 should be also checked
 now that it can write matrix too.

 Also your nice fix from chroma sample location broke JPEG sample when you
 go from 4:2:0 JPEG with thus center location to rgb h264 which is now
 tagged as center but RGB cannot be center chroma, it does not have chroma.
 4:4:4 may be affected too.
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Ticket URL: <https://trac.ffmpeg.org/ticket/9167#comment:38>
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