[FFmpeg-trac] #4746(swscale:closed): prores alpha blending results in opaque rectangle

[FFmpeg]

#4746: prores alpha blending results in opaque rectangle
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             Reporter:               |                    Owner:
  projectsymphony                    |                   Status:  closed
                 Type:  defect       |                Component:  swscale
             Priority:  normal       |               Resolution:  fixed
              Version:  git-master   |               Blocked By:
             Keywords:  prores       |  Reproduced by developer:  1
  alpha                              |
             Blocking:               |
Analyzed by developer:  0            |
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Comment (by gjdfgh):

 Turns out QT's "export" function gets it wrong (like ffmpeg), while
 playback works.

 So if you compare ffplay and QT output, this bug report is still
 justified, but not if you compare ffmpeg and QT export.

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Ticket URL: <https://trac.ffmpeg.org/ticket/4746#comment:47>
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