[FFmpeg-trac] #549(avfilter:open): Video filter overlay does not preserve alpha

[FFmpeg]

#549: Video filter overlay does not preserve alpha
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             Reporter:  ehsmeng      |                    Owner:
                 Type:  defect       |                   Status:  open
             Priority:  normal       |                Component:  avfilter
              Version:  git-master   |               Resolution:
             Keywords:  overlay      |               Blocked By:
  alpha png                          |  Reproduced by developer:  1
             Blocking:               |
Analyzed by developer:  1            |
-------------------------------------+-------------------------------------
Changes (by saste):

 * analyzed:  0 => 1
 * status:  new => open
 * reproduced:  0 => 1


Comment:

 Partially fixed by the addition of the rgb option in overlay.

 By setting rgb=1 alpha information is preserved, the problem that it still
 doesn't work with YUV input, so overlay by default won't preserve alpha,
 that's why I'm keeping the ticket open.

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Ticket URL: <http://ffmpeg.org/trac/ffmpeg/ticket/549#comment:1>
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