[Bug 787820] glvideomixer: need update output geo after src caps reconfigure

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=787820

--- Comment #5 from Haihua Hu <jared.hu at nxp.com> ---
(In reply to Matthew Waters (ystreet00) from comment #4)
> (In reply to Haihua Hu from comment #3)
> > You mean which compositor element?
> 
> https://cgit.freedesktop.org/gstreamer/gst-plugins-bad/tree/gst/compositor

BTW， why it will failed on this：
videotestsrc ! video/x-raw,width=320,height=240 ! glvideomixer !
video/x-raw(ANY),width=800,height=600 ! fakesink

And I didn't find GstGLMixerClass::set_caps() implementation, do you mean
negotiated_caps

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