[FFmpeg-trac] #4609(avformat:new): webp muxer seeks backwards

[FFmpeg]

#4609: webp muxer seeks backwards
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             Reporter:  ronag       |                     Type:  defect
               Status:  new         |                 Priority:  normal
            Component:  avformat    |                  Version:  git-master
             Keywords:  webp muxer  |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
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 The webp muxer needs to seek backwards.

 Currently when e.g. outputting to a pipe the output will be corrupt.

 ffmpeg -i file.png -f webp - > test.webp

 Should probably throw an error at least?

 Though, I believe it should be possible to implement the muxer in such a
 way that it doesn't write to output until the header has all required
 information.

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Ticket URL: <https://trac.ffmpeg.org/ticket/4609>
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