[Bug 749517] aggregator: won't start until all pads have a buffer

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=749517

--- Comment #4 from Philippe Renon <philippe_renon at yahoo.fr> ---
This is a minimalistic and testable version of the target pipeline:

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

videotestsrc ! video/x-raw, width=320, height=240, framerate=20/1 ! 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 goal is to overlay generated gfx (here some text) over a live video source
(here a videotstsrc). The gfx generator (here a textrender) consumes data
buffers and turns them into a video buffer.

To send pango text packets to the udpsrc use this command line :

echo -n '<span color="blue">Hello</span>' | nc -4u -w1 127.0.0.1 9000

As stated, the pipeline will not start (i.e. display the live source) until a
first packet is sent to the udpsrc.

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