[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 #11 from Josep Torra Valles <n770galaxy at gmail.com> 2014-03-25 17:37:45 UTC ---
First I've wanted to use testegl as a test bed for this approach as a first
step before introduce changes in the other sink elements.

My primary goal is be able to handle adaptive streaming scenarios in the RPI
with 1.4 GStreamer series and the RECLAIM event might not be available until
1.6, that's the reason why I wanted to explore with the current available tools
although it might not be the most perfect solution.

Right now there's multiple issues linked to this missing reclaim step.

And a GPU resource leak that I'm also investigating which is related to this
set of scenarios.

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