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

[FFmpeg]

#8509: Converting 8 bit ARGB to Prores 4444 using prores_ks produces alpha channel
that is not 100%
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             Reporter:  bford      |                    Owner:
                 Type:  defect     |                   Status:  new
             Priority:  normal     |                Component:  avcodec
              Version:  4.2        |               Resolution:
             Keywords:  prores_ks  |               Blocked By:
             Blocking:             |  Reproduced by developer:  0
Analyzed by developer:  0          |
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Changes (by bford):

 * Attachment "Prores444.mov" added.

 Resulting output with alpha=254

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