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

FFmpeg trac at avcodec.org
Tue Aug 4 22:22:29 CEST 2015

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

 * keywords:   => prores alpha
 * status:  new => closed
 * resolution:   => worksforme


 Replying to [comment:9 projectsymphony]:
 > It's a well known behaviour that when alpha is converted to an opaque
 format it is blended with black by default

 This is not how FFmpeg or avconv behave (or ever have) and such a
 behaviour would be a significant and unexpected change afaict. (And why
 should black be the default? See for example laraShadow_dl.flv.)

 I am closing this ticket because I neither see a bug nor do I think the
 bug tracker is the right place to discuss a significant change of
 behaviour: Imo, send a patch (or PoC) to the development mailing lists.

Ticket URL: <https://trac.ffmpeg.org/ticket/4746#comment:10>
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