[FFmpeg-trac] #5622(undetermined:new): Image overlay with straight alpha

FFmpeg trac at avcodec.org
Wed Jun 8 17:23:42 CEST 2016

#5622: Image overlay with straight alpha
             Reporter:  jb_alvarado  |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
              Version:  unspecified  |  undetermined
             Keywords:               |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0

Comment (by jb_alvarado):

 I am not 100% sure if this is a straight alpha, but when I render this
 png's I have an option "Pre-Divide by Alpha", normally this option is off.
 If I turn it on, the overlay in ffmpeg is good, without boarder.
 The Problem is, that I mostly don't know, if somebody turn this option on,
 or not. So it would be nice to have an option in ffmpeg to fix this.

Ticket URL: <https://trac.ffmpeg.org/ticket/5622#comment:1>
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