[Bug 741263] videodecoder: implement caps query

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=741263
  GStreamer | gst-plugins-base | unspecified

--- Comment #15 from Sebastian Dröge (slomo) <slomo at coaxion.net> 2014-12-16 14:55:37 UTC ---
Indeed. Parsers use a different acceptcaps for that, which is only checking for
intersection instead of subset. But that will break if the decoder requires a
specific codec profile, and upstream provides none in the caps. For example.

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