[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 #12 from Philippe Renon <philippe_renon at yahoo.fr> ---
I have this problematic use case:

compositor name=mixer sink_1::ypos=50 ! videoconvert ! timeoverlay
shaded-background=true auto-resize=false ! autovideosink

v4l2src ! mixer.

udpsrc port=9000 ! identity dump=false ! textrender halignment=left
line-alignment=left ! video/x-raw, width=320, height=120 ! videorate
drop-only=true ! video/x-raw, framerate=10/1 ! mixer.

The pipeline will not start until a 1st udp packet is sent to the udpsrc.
Once that packet is sent, the pipeline will complain about lots of too late
frames. After that it runs fine.

This issue was first declared in
https://bugzilla.gnome.org/show_bug.cgi?id=749517 (sorry to mention it
again...).
Again I am not entirely sure "my" issue is related to the issues discussed
here.
Don't hesitate to tell me to go away if it is not :)

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