[FFmpeg-trac] #163(undetermined:open): png output creates artifacts or blank image with x11grab input

[FFmpeg]

#163: png output creates artifacts or blank image with x11grab input
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Reporter:  llogan        |       Owner:
    Type:  defect        |      Status:  open
Priority:  minor         |   Component:  undetermined
 Version:  git-master    |  Resolution:
Keywords:  x11grab, png  |  Blocked By:
Blocking:                |  Reproduced:  1
Analyzed:  0             |
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Comment (by reimar):

 FFmpeg captures with alpha channel, though RGB32 for X does not usually
 include alpha but instead has a constant 0.
 That constant 0 ends up as "fully transparent" in the png.
 If you remove the alpha channel (e.g. in GIMP decompose as RGB and then
 compose again) you will see the image is there.
 -pix_fmt rgb24 is of course a better way to get the same effect.

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/163#comment:3>
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