[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 #6 from Nicolas Dufresne (stormer) <nicolas.dufresne at collabora.co.uk> ---
(In reply to Philippe Renon from comment #5)
> This issue might be related (or not) to this one :
> https://bugzilla.gnome.org/show_bug.cgi?id=749517

Not entirely. This is about having the ability to choose the first frame
behaviour.

- Produce first frame on deadline (background/silence if nothing came in)
- Produce first frame only when at least one pad has data
- Produce first frame only when all pad have data

And because there is 3 decent uses cases for each, I think this is worth an
enumeration to select the first-frame mode.

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