[FFmpeg-trac] #9179(avformat:open): webp muxer fails to write out loop count

[FFmpeg]

#9179: webp muxer fails to write out loop count
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             Reporter:  octop        |                    Owner:
                 Type:  defect       |                   Status:  open
             Priority:  important    |                Component:  avformat
              Version:  git-master   |               Resolution:
             Keywords:  webp         |               Blocked By:
  regression                         |
             Blocking:               |  Reproduced by developer:  1
Analyzed by developer:  0            |
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Comment (by mkver):

 The reason for this is that with the newer version only one packet ever
 reaches the muxer, so the check for frame_count > 1 kicks in and ensures
 that the loop counter won't be written.

 With both the old and the new version there is a massive memleak because
 the encoder is apparently never properly closed; with the old version
 there are also memleaks that would appear if zero-sized packets reach the
 muxer (this is the kind of memleak that my patch was about).

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Ticket URL: <https://trac.ffmpeg.org/ticket/9179#comment:3>
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