[FFmpeg-trac] #7902(undetermined:new): GIF transparent frames overlapping

[FFmpeg]

#7902: GIF transparent frames overlapping
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             Reporter:  kolopo       |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  git-master   |               Resolution:
             Keywords:  gif alpha    |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------

Comment (by byteslice):

 Removing the first frame check, which unconditionally sets the first
 frame's disposal method to combine, in gif_image_write_image
 (libavcodec/gif.c) appears to fix the issue. I am unsure why this check
 was introduced; is removing it a bad idea?

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Ticket URL: <https://trac.ffmpeg.org/ticket/7902#comment:7>
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