[Bug 789462] Multi branched pipe freezes in case CPU overloaded

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=789462

--- Comment #3 from Mathieu Duponchelle <mduponchelle1 at gmail.com> ---
(In reply to Nicolas Dufresne (stormer) from comment #2)
> My impression is that we already address this in
> https://bugzilla.gnome.org/show_bug.cgi?id=789467
> 
> With adding QoS to the encoder. A leaky queue could also work, but may not
> drop the appropriate frames.

Hm maybe, what I observe here with videotestsrc is simply that the pipeline
fails to preroll with:

gst-launch-1.0 videotestsrc ! tee name=teebranch ! queue ! autovideosink
teebranch. ! queue ! x264enc ! fakesink

because the video sink branch prerolls then blocks, and the encoder branch
never pushes a buffer because its latency is superior to 1 second :)

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