[Bug 749966] New: 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

            Bug ID: 749966
           Summary: videoaggregator: add wait-sinks property to wait for
                    inputs before creating output frames
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: frederic.sureau at vodalys.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 304077
  --> https://bugzilla.gnome.org/attachment.cgi?id=304077&action=edit
videoaggregator: add wait-sinks property

Discussion started here :
http://lists.freedesktop.org/archives/gstreamer-devel/2015-May/052854.html

Currently, compositor outputs black frames until inputs are given.
Initialisation time in some elements (like v4l2src) makes first frames not
start at 0:00:00 which creates a sequential composition effect (black, then one
frame, then 2 frames, etc.)

A solution is to add a "wait-sinks" property to videoaggregator.
"none" (default) does not wait for sinks
"one" waits for at least one sink
"all" waits for all sinks

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