[FFmpeg-trac] #8215(avdevice:open): AVFoundation recording has inaccurate RGB values

[FFmpeg]

#8215: AVFoundation recording has inaccurate RGB values
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             Reporter:  LordHDL      |                    Owner:
                                     |  thilo.borgmann
                 Type:  defect       |                   Status:  open
             Priority:  normal       |                Component:  avdevice
              Version:  git-master   |               Resolution:
             Keywords:               |               Blocked By:
  avfoundation                       |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by LordHDL):

 When examining the pixels with a color tool (macOS has a preinstalled one
 called Digital Color Meter), the RGB values do not match the source.
 Recording with other software that supports these pixel formats (Syphon
 Recorder, OBS, etc.) will preserve the correct values, as will taking
 simple png/tiff screen shots.  When using Digital Color Meter, select
 "display native values" to see 8-bit RGB, and compare a source (solid
 colors work best) with a media player that is confirmed to display RGB
 correctly (ffplay).

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Ticket URL: <https://trac.ffmpeg.org/ticket/8215#comment:4>
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