[FFmpeg-trac] #10918(avfilter:new): "palettegen" predefined must-have colors (new option "preset")

[FFmpeg]

#10918: "palettegen" predefined must-have colors (new option "preset")
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             Reporter:               |                     Type:
  MasterQuestionable                 |  enhancement
               Status:  new          |                 Priority:  normal
            Component:  avfilter     |                  Version:
                                     |  unspecified
             Keywords:  palettegen   |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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 It would be desirable to assert certain must-have colors in advance.
         E.g. "`preset=#F00 #010203`" alike.
         .
         Which should not exceed "[https://ffmpeg.org/ffmpeg-
 filters.html#palettegen max_colors]".
         And the ordering in generated palette should be readapted.
         (according to frequency of occurrence (descending), presumably?)

         See also:
 https://trac.ffmpeg.org/query?reporter=MasterQuestionable&time=2024-03-20&col=id&col=type&col=summary&col=component&col=keywords&col=reporter&col=status&col=resolution&col=time&col=changetime&order=changetime&desc=1
         (my recent posts on "palettegen"/"paletteuse")
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Ticket URL: <https://trac.ffmpeg.org/ticket/10918>
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