[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 #8 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
(In reply to Sebastian Dröge (slomo) from comment #7)

> I still think a per-pad configuration makes more sense for this. Usually
> from the application side you know which pads will have data when, which are
> important to wait for and which not.

Also for the "global settings" (produce when one pad has data), you're
completely dependent on your OS's scheduler what the frames contain. And it
might have interesting effects in video/audioaggregator, if due to scheduler
jitter we produce gaps. E.g.

> stream 1:
>   [0, 1] [0, 2] [0, 3]
> stream 2:
> [0, 1]     [0, 2]   [0, 3]

Here you would with the "produce when one pad has data" setting produce lots of
gaps in the stream.

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