[Bug 770225] multiqueue: High CPU usage with multiple audio tracks in playbin3

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=770225

--- Comment #5 from Edward Hervey <bilboed at bilboed.com> ---
After digging deeper, moving the computation out of the loop still results in
very high CPU usage (playing a 8 video/8 audio file, results in 212% cpu usage
of which only 1% is video decoding).

The culprit seems to be an insane amount of futex usage.

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