[Bug 735450] vp8dec: Does not support alpha channel

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=735450
  GStreamer | gst-plugins-good | 1.2.4

Sebastian Dröge (slomo) <slomo> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |NEW

--- Comment #3 from Sebastian Dröge (slomo) <slomo at coaxion.net> 2014-08-28 09:15:05 UTC ---
Interesting... but not sure how to best support that in GStreamer. I guess we
could add the alpha VP8 in a meta, and then have vp8dec run two decoder
instances... but that seems rather ugly, although better than the other
alternatives :) I guess that would be the way to go.

1) Add the BlockAddition blocks to a custom VP8 specific meta in matroskademux
for VP8/VP9 video streams
2) Add support for those metas in vp8dec/vp9dec

Optionally:
3) Add support for that in vp8enc/vp9enc and matroskamux too



Seems like a lazy hack to support alpha without adding alpha support to the
codec itself.

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