[FFmpeg-trac] #10920(avfilter:closed): "paletteuse" keeps unused colors for PNG unnecessarily

[FFmpeg]

#10920: "paletteuse" keeps unused colors for PNG unnecessarily
-------------------------------------+-------------------------------------
             Reporter:               |                    Owner:  (none)
  MasterQuestionable                 |
                 Type:  enhancement  |                   Status:  closed
             Priority:  normal       |                Component:  avfilter
              Version:  unspecified  |               Resolution:  invalid
             Keywords:  paletteuse   |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------

Old description:

> Unsure for other formats.
>         But for PNG, it's unnecessary.
>
>         Tested with !`-lavfi "paletteuse=dither=none"`.
>
>         See also:
> https://trac.ffmpeg.org/query?reporter=MasterQuestionable&time=2024-03-20&summary=~palette&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")

New description:



--
Comment (by MasterQuestionable):

 ͏    Have you tried !`zopflipng`?
 ͏    The palette can be smaller than 256. (and the difference is not
 dummy)
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/10920#comment:3>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker