[Bug 758212] playbin adds the template caps on autoplug-query

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=758212

--- Comment #8 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
This breaks autoplugging in playbin if a video decoders outputs some raw video
format that the sink does not support. What happens is
1) sink accept-caps
2) __gst_video_element_proxy_getcaps()
3) __gst_video_element_proxy_caps() creates a filter caps that only contains
the width/height/par/framerate restrictions, not a format restriction
4) Downstreams gets a CAPS query with that filter, the sink answers with a
format that our decoder does not support
5) Intersecting with the source pad template caps yields EMPTY

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