Use mmal_queue_timedwait instead of mmal_queue_wait to avoid deadlocks if due
to some unexpected reason no mmal buffer is available for a picture to be
locked. This makes the mmal plugins more robust against mmal internal
failures.
Signed-off-by: Julian Scheel <julian@jusst.de>
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>