[Bug 749966] videoaggregator: add wait-sinks property to wait for inputs before creating output frames

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=749966

--- Comment #4 from Nicolas Dufresne (stormer) <nicolas.dufresne at collabora.co.uk> ---
(In reply to Sebastian Dröge (slomo) from comment #3)
> I think this should be a per-sinkpad property in GstAggregator, it's not
> only useful for video.

That clash with my idea that it would be nice if the aggregator could start
when the first chunk of data arrive, instead of producing background meanwhile.

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