[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 #21 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
Frédéric, Philippe, does this also solve your problem?

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