[Bug 774322] playbin3: can't disable audio/video via flags property

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=774322

Jan Schmidt <thaytan at noraisin.net> changed:

           What    |Removed                     |Added
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                 CC|                            |thaytan at noraisin.net

--- Comment #2 from Jan Schmidt <thaytan at noraisin.net> ---
The problem here is:

* Multiqueue is in sync-by-running-time mode, and hence using a 'high time' per
pad group to advance not-linked pads
* There is only 1 pad in each group (1 video, 1 audio)
* In that case, the group-high-time is set to the global mq high-time, to
follow behind any other groups
* the not-linked video pad gets the mq->high_time taken from the audio stream,
then goes to sleep
* per-group high time is only recomputed when a pad from the group has pushed
something, so after the single video pad goes to sleep, nothing will ever
recompute its high-time

My proposed patch keeps the group_high_time = NONE in such single-pad groups,
and uses that as a flag to check them against the global high time instead,
which is always recomputed.

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