[FFmpeg-trac] #8861(avfilter:new): Creating GIF with full transparent background from PNGs with semi-transparent pixels, somehow causes this outline

[FFmpeg]

#8861: Creating GIF with full transparent background from PNGs with semi-
transparent pixels, somehow causes this outline
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             Reporter:  karl-police  |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:  avfilter
              Version:  git-master   |               Resolution:
             Keywords:  paletteuse   |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by cehoyos):

 Replying to [comment:12 karl-police]:

 > but why are there these artifacts?
 Because of a known bug in the gif encoder that is not related to the
 behaviour of the `paletteuse` option `dither`.

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Ticket URL: <https://trac.ffmpeg.org/ticket/8861#comment:14>
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