[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 #24 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
Yeah, that would be some kind of "last". However that's non-trivial to
implement :) You would have to drop input buffers (in live mode only!) until
all streams had at least one buffer, and from that point start outputting. In
non-live mode you can block until all pads have buffers, and then just take the
highest start timestamp of all pads.

Feel free to add that on top of my patch

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