[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 projectsymphony):

 Replying to [comment:47 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.

 Oh interesting, thanks for explaining what cehoyos meant, one would expect
 steps to reproduce to be provided when making claims...

 Anyway, I have filed a bug with Apple about this, rdar://22499505, at
 least something productive can come out of this.

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Ticket URL: <https://trac.ffmpeg.org/ticket/4746#comment:49>
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