[Bug 739695] assrender poorly handles transparency

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=739695
  GStreamer | gst-plugins-bad | git

--- Comment #1 from Andreas Frisch <fraxinas at opendreambox.org> 2014-11-06 09:40:17 UTC ---
so i went through and wrote the raw data into files at different spots and it
turns out that the bitmaps get rendered correctly and the alpha channels breaks
once gst_video_overlay_composition_blend is called in
gst_ass_render_chain_video()

it doesn't make a difference whether the overlay rectangle was created with
GST_VIDEO_OVERLAY_FORMAT_FLAG_PREMULTIPLIED_ALPHA or
GST_VIDEO_OVERLAY_FORMAT_FLAG_NONE

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