[Bug 757610] compositor: negotation failure when mixing alpha and non alpha branches

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=757610

--- Comment #4 from Philippe Renon <philippe_renon at yahoo.fr> ---
I have just reproduced the issue with gstreamer 1.6.3 on windows.

To reproduce the issue:

1/ Run this pipeline:

compositor name=mixer ! videoconvert ! autovideosink \
ksvideosrc ! queue ! mixer. \
udpsrc port=9000 ! textrender ! videorate drop-only=true ! video/x-raw,
framerate=10/1 ! queue ! mixer. 

It will start fine and show the ksvideosrc output.

2/ Send any udp message to localhost:9000.

You can use "Packet Sender" on windows or do the following on linux:

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

The pipeline will then fail with this error:

ERROR: from element /GstPipeline:pipeline0/GstTextRender:textrender0: GStreamer
error: negotiation problem.
Additional debug info:
../../../gst-plugins-base-1.6.3/ext/pango/gsttextrender.c(511):
gst_text_render_chain (): /GstPipeline:pipeline0/GstTextRender:textrender0


I attached a log (with GST_DEBUG=6) that shows the issue.

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