[FFmpeg-trac] #3846(avcodec:new): The output video show a wrong alpha

[FFmpeg]

#3846: The output video show a wrong alpha
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             Reporter:  Noir89         |                    Owner:
                 Type:  defect         |                   Status:  new
             Priority:  normal         |                Component:  avcodec
              Version:  git-master     |               Resolution:
             Keywords:  ProRes, alpha  |               Blocked By:
             Blocking:                 |  Reproduced by developer:  0
Analyzed by developer:  0              |
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Comment (by kurosu):

 Does After Effect support alpha at all? A way to test this, if possible,
 would be to save with Final Cut Pro a sequence you know contains alpha in
 prores 4444 format, and try reopening it in After Effects. If this one
 works, please provide the prores file. Ideally, it would be the same
 sequence as we are debugging with.

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Ticket URL: <https://trac.ffmpeg.org/ticket/3846#comment:13>
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