[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
-------------------------------------+------------------------------------
             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            |
-------------------------------------+------------------------------------

Comment (by pdr0):

 Replying to [comment:8 karl-police]:

 > What does -r do? And why exactly 25?

 -r as an input option (before the -i) sets the input framerate  . An image
 sequence can be any framerate . I randomly chose 25. Choose the framerate
 you want for the speed of the animation. -vf fps will duplicate or drop
 frames to achieved the desired output fps, based on the input framerate .
 It does not make sense that -vf fps should cause that artifact

--
Ticket URL: <https://trac.ffmpeg.org/ticket/8861#comment:10>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker