[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

Frédéric Sureau (sfred) <frederic.sureau at veo-labs.com> changed:

           What    |Removed                     |Added
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                 CC|                            |frederic.sureau at veo-labs.co
                   |                            |m

--- Comment #23 from Frédéric Sureau (sfred) <frederic.sureau at veo-labs.com> ---
(In reply to Sebastian Dröge (slomo) from comment #21)
> Frédéric, Philippe, does this also solve your problem?

No, my use case is to encode and store the composite of 2 live sources.
So what I need is to wait for all sinks and start outputting at the last
timestamp. For example, using compositor, I have 2 streams starting
respectively at 300ms and 400ms. The output stream should start at 400ms to
avoid having black frames or incomplete composition.

Maybe it could correspond to a 4th option
GST_AGGREGATOR_START_TIME_SELECTION_LAST ?

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