[FFmpeg-trac] #979(swscale:open): Abnormal colorspace conversion of BGR -> YUV comparing the RGB variant

[FFmpeg]

#979: Abnormal colorspace conversion of BGR -> YUV comparing the RGB variant
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             Reporter:  natt        |                    Owner:  (none)
                 Type:  defect      |                   Status:  open
             Priority:  normal      |                Component:  swscale
              Version:  git-master  |               Resolution:
             Keywords:  scale       |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
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Changes (by Balling):

 * keywords:   => scale

Comment:

 I was thinking about this issue, since dither cannot be removed in scale
 in this transform (sws_dither none indeed has no effect), only in zscale
 (by default no dither) that is what causes this issue, I imagine. Off-by-
 one in colors must be dither. And again even the better result is still

 "are mostly the same (in the start of the file), " in the end it is
 different anyway, so that means it is dither.
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Ticket URL: <https://trac.ffmpeg.org/ticket/979#comment:24>
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