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

[GStreamer (GNOME Bugzilla)]

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

--- Comment #11 from Haihua Hu <jared.hu at nxp.com> ---
(In reply to Matthew Waters (ystreet00) from comment #8)
> (In reply to Haihua Hu from comment #7)
> > (In reply to Matthew Waters (ystreet00) from comment #6)
> > Maybe we can do something like that when width and height is fixed, we do
> > not update it, otherwise update it with our best width and height.
> 
> That is literally the entire point of gst_structue_fixate_nearest_int() ;)

I notice there is a description of the videoaggregator specification on
https://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-bad-libs/html/GstVideoAggregator.html

Description

VideoAggregator can accept AYUV, ARGB and BGRA video streams. For each of the
requested sink pads it will compare the incoming geometry and framerate to
define the output parameters. Indeed output video frames will have the geometry
of the biggest incoming video stream and the framerate of the fastest incoming
one.

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