[Bug 791202] aggregator: need gst_aggregator_pad_set_nowait() for sparse streams

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=791202

--- Comment #11 from Tim-Philipp Müller <t.i.m at zen.co.uk> ---
I could see a use case where one might want to wait "just a little" just to
give the scheduler enough time to push through some data.

Example: textoverlay waiting for subtitles on the text pad (let's ignore that
we will usually get gap events there). If we have a playback pipeline that's
paused and just move the slider in the movie player we ideally want to see the
subtitles if they're available and produce in time. In a playback situation it
wouldn't matter because if they're not put on top of this frame they'll be
there for the next, but for a snapshotting pipeline or a player in paused state
one might get better results if one could wait on the text pad just a little.
(How much that should be I don't know.)

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