[Bug 639763] [dvbsuboverlay] Green borders around subtitles

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=639763
  GStreamer | gst-plugins-bad | git

--- Comment #2 from Raimo Järvi <raimo.jarvi at gmail.com> 2011-03-16 22:40:25 UTC ---
Apparently this is caused by using the average alpha value for all pixels in
the 2x2 block, instead of using each pixel's own alpha value. Background color
is transparent green, hence the green tint if there are both transparent and
opaque pixels in the block.

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