[Bug 739754] v4l2bufferpool: Should validate that all memories are writeable before queueing back

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=739754
  GStreamer | gst-plugins-good | 1.4.3

--- Comment #2 from Nicolas Dufresne (stormer) <nicolas.dufresne at collabora.co.uk> 2014-11-07 02:28:58 UTC ---
Note that it reveals contention when running the test pipeline proposed here.
This is due to sub-optimal amount of buffers being allocated. The issues are
because the video sink don't account for their last-sample, something that
could be fixed in base class most likely. intervideosink internal also need an
extra buffer, though it does not really need 2 extra, as both last sample and
the internal buffer have same life time. These should be filed and fixed in
separate bugs imho.

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