[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):

 By the way, could you also test with "-pix_fmt yuv444p10le -profile 4444"?
 I suspect some of your software may misbehave (even crash) if we use a
 profile for alpha content, but don't have encode it.

 The After Effect situation is unfortunate, but I fear it will be more
 difficult to solve. Maybe try adding "-alpha_bits N" with N being 0/8/16?

 Thank you.

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Ticket URL: <https://trac.ffmpeg.org/ticket/3846#comment:11>
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