[FFmpeg-trac] #5431(avformat:new): ffmpeg's native WebP muxer always sets ALPHA_FLAG to be true in VP8X chunk

[FFmpeg]

#5431: ffmpeg's native WebP muxer always sets ALPHA_FLAG to be true in VP8X chunk
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             Reporter:  triune      |                    Owner:
                 Type:  defect      |                   Status:  new
             Priority:  normal      |                Component:  avformat
              Version:  git-master  |               Resolution:
             Keywords:  mkv         |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
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Changes (by cehoyos):

 * keywords:   => mkv
 * priority:  important => normal
 * component:  undetermined => avformat


Comment:

 Is a specific input file necessary to reproduce the issue or is it
 reproducible with {{{-f lavfi -i color}}}?
 Please provide an (as simple as possible) command line together with the
 complete, uncut console output to make this a valid ticket.

 Note that the quote you put in the description would indicate that it is
 correct to set the flag if you don't know in advance if a transparent
 frame may appear later.

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Ticket URL: <https://trac.ffmpeg.org/ticket/5431#comment:1>
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