[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 #1 from Frédéric Sureau <frederic.sureau at vodalys.com> ---
Here is the pipeline I use for testing:

GST_DEBUG=videoaggregator:7 gst-launch-1.0 -ev compositor wait-sinks=none
name=comp sink_1::alpha=0.5 sink_1::xpos=50 sink_1::ypos=50 ! fakesink
silent=false  videotestsrc pattern=snow timestamp-offset=3000000000 !
"video/x-raw,format=AYUV,width=640,height=480,framerate=(fraction)30/1" !
queue2 ! comp.   videotestsrc pattern=smpte timestamp-offset=2000000000 !
"video/x-raw,format=AYUV,width=800,height=600,framerate=(fraction)10/1" !
queue2 ! comp.

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