[Bug 726107] Drain pipeline to support adaptive streaming scenarios and partially fix gpu resource leaks

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=726107
  GStreamer | gst-omx | git

--- Comment #14 from Nicolas Dufresne <nicolas.dufresne at collabora.co.uk> 2014-03-25 17:49:05 UTC ---
The reason I'd prefer we make a blocker of it, is that I have the same issue in
v4l2 decoder (and many buffer pools that cannot detach from it's buffers).
Obviously we can probably improve overall support of drain query and just make
it work. Let's try and talk about that on IRC soon and not do our own little
thing in the corner.

The basic idea is that, the query should stop as soon as there is a stream pool
change. E.g. a encoder will have two pools, when it receive the drain query, it
should drain anything related to it's input pool but there is no point in
forwarding. Though as said, drain was not designed to do that, and being a
query is just a non-sense to me.

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