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

[GStreamer (GNOME Bugzilla)]

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

--- Comment #6 from Matthew Waters (ystreet00) <ystreet00 at gmail.com> ---
(In reply to Haihua Hu from comment #5)
> (In reply to Matthew Waters (ystreet00) from comment #4)
> 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

Because best_width/height will contain some combination of the input frames and
blanket overriding them will cause video/x-raw,width=320,height=240 to be set
on the output src pad which does not intersect with downstream's
video/x-raw(ANY),width=800,height=600 and thus will fail to negotate.

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

The glvideomixer implementation of GstGLMixerClass::set_caps() at
https://cgit.freedesktop.org/gstreamer/gst-plugins-bad/tree/ext/gl/gstglvideomixer.c#n870

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