[FFmpeg-trac] #8509(avcodec:new): Converting 8 bit ARGB to Prores 4444 using prores_ks produces alpha channel that is not 100% opaque

[FFmpeg]

#8509: Converting 8 bit ARGB to Prores 4444 using prores_ks produces alpha channel
that is not 100% opaque
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             Reporter:  bford       |                    Owner:
                 Type:  defect      |                   Status:  new
             Priority:  normal      |                Component:  avcodec
              Version:  git-master  |               Resolution:
             Keywords:  prores      |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
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Comment (by cehoyos):

 Replying to [ticket:8509 bford]:

 > Using QTRLE for an output codec works fine; all alpha channel values are
 correct.
 Does `-vf format=argb` help?

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Ticket URL: <https://trac.ffmpeg.org/ticket/8509#comment:4>
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