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

[FFmpeg]

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

 * status:  closed => reopened
 * resolution:  fixed =>


Comment:

 Replying to [comment:36 cehoyos]:
 > This issue was fixed, if you want to report another issue, please open a
 new ticket.

 The issue is *not* fixed, converting this sample with {{{ffmpeg -i
 proresalphablock.mov -pix_fmt yuv420p output.mov}}} produces a file which
 differs from the one played with the reference decoder (quicktime).

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Ticket URL: <https://trac.ffmpeg.org/ticket/4746#comment:40>
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