[FFmpeg-trac] #9192(swscale:open): Command line switch sws_dither doesn't allow "none"

[FFmpeg]

#9192: Command line switch sws_dither doesn't allow "none"
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             Reporter:  Videogamer555  |                    Owner:  (none)
                 Type:  defect         |                   Status:  open
             Priority:  minor          |                Component:  swscale
              Version:  git-master     |               Resolution:
             Keywords:                 |               Blocked By:
             Blocking:                 |  Reproduced by developer:  0
Analyzed by developer:  0              |
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Comment (by Balling):

 So none always means 0.
 https://github.com/FFmpeg/FFmpeg/blob/fce01276422a0e121d61aec811ee1773f9013b9c/libavutil/opt.c#L300

 So there is no bug. If anything

 ‘none’
         no dithering

 should be removed from documentation because it shadows global variable.
 Zero is good.
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Ticket URL: <https://trac.ffmpeg.org/ticket/9192#comment:11>
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