[FFmpeg-trac] #9192(swscale:new): 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:  new
             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 Anton1699):

 > "Accepts one of the following values" is also a lie, BTW. For example,
 print_info can be combined with other options and so is accurate_rnd that
 fixes bgr to yuv420p and so is bitexact which fixes some of jpeg scaling
 (though the last one I am not so sure, D:) ).

 `-sws_dither` and `-sws_flags` are two different things though.
 `-sws_flags` is supposed to take multiple flags and the documentation
 clearly says “It accepts the following values”
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Ticket URL: <https://trac.ffmpeg.org/ticket/9192#comment:8>
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