[Bug 761940] v4l2: deadlock when using dmabuf-import (zero-copy) between two V4L2 devices

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=761940

--- Comment #3 from Carlos Alberto Lopez Perez <clopez at igalia.com> ---
I have been debugging this, and I have observed that if I raise
GST_V4L2_MIN_BUFFERS from 2 to 8 I get video playback working for ~1 second and
then it deadlocks again.

After more debugging, I think that the deadlocks happens when the bufferpool is
full.

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