[FFmpeg-trac] #4829(swscale:open): Overflows (?) in xyz -> rgb conversion

[FFmpeg]

#4829: Overflows (?) in xyz -> rgb conversion
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             Reporter:  cehoyos     |                    Owner:
                 Type:  defect      |                   Status:  open
             Priority:  normal      |                Component:  swscale
              Version:  git-master  |               Resolution:
             Keywords:  xyz         |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
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Comment (by Balling):

 >So what? Of course, the artifacts can be in original xyz12le file.

 And it looks like it is possible. Here in leaked "My little pony" in DNxHD
 175x (magnet magnet:?xt=urn:btih:215babe2205786dbc77dd58607fc4490302112c3)
 you have the same Posterization even though the file is 10 bit SDR with
 very high quality.

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Ticket URL: <https://trac.ffmpeg.org/ticket/4829#comment:4>
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