[Bug 751484] compositor: refactor in order to have alpha sources blended over non alpha ones

GStreamer (GNOME Bugzilla) bugzilla at gnome.org
Thu Jun 25 09:21:26 PDT 2015


https://bugzilla.gnome.org/show_bug.cgi?id=751484

--- Comment #1 from Jean-Michel Hautbois (jmleo) <jean-michel.hautbois at veo-labs.com> ---
Example pipeline :

gst-launch-1.0 -evv videotestsrc is-live=true !
'video/x-raw,format=NV12,width=1280,height=720' ! \
compositor name=mux ! 'video/x-raw,format=NV12,width=1280,height=720' !
fakesink \
videotestsrc is-live=true ! 'video/x-raw,format=ARGB,width=320,height=240' !
mux.

The objective is to avoid videconversion from NV12 to ARGB or ARGB to NV12.
Right now, it is not working, as downstream has no alpha and one of sinks has.

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