[Bug 774945] multiudpsink, dynudpsink, v4l2sink: Block in preroll_wait on unlock

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=774945

--- Comment #1 from Olivier Crête <olivier.crete at ocrete.ca> ---
Created attachment 340624
  --> https://bugzilla.gnome.org/attachment.cgi?id=340624&action=edit
v4l2sink: Block in preroll_wait on unlock

The correct behaviour of anything stuck in the ->render() function
between ->unlock() and ->unlock_stop() is to call
gst_base_sink_wait_preroll() and only return an error if this returns an
error, otherwise, it must continue where it left off!

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