[Bug 746808] Queue with min-threshold stalls dynamic pipeline

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=746808

--- Comment #7 from Tim-Philipp Müller <t.i.m at zen.co.uk> ---
It sounds like what you want is basically a 'backbuffer'. When you start
recording, you want to include data from a few seconds before the record button
was hit.

http://people.freedesktop.org/~tpm/code/test-backlog-recording-h264.c

Implements that using a different approach: it uses a leaky queue with a pad
block. While the pad is blocked, old buffers are getting dropped. The same
should happen to any allocation query in that case.

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