[Bug 783753] splitmux: Drop allocation queries

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=783753

--- Comment #4 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
The problem here is that at any point in time, upstream can send an ALLOCATION
(or any other serialized) query. This ends up in the queue inside splitmuxsink,
which has to run empty for the query to be forwarded. However splitmuxsink has
various parts in the code that wait for new buffers to be put into the queue
before it proceeds, which then will wait forever (upstream waiting for
allocation query, so no new buffers vs. downstream/splitmuxsink waiting for new
buffers by upstream before consuming the current ones in the queue).

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