[Bug 764363] videoaggregator: Setting aspect ratio crops the frame

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=764363

--- Comment #2 from Thibault Saunier <tsaunier at gnome.org> ---
(In reply to Matthew Waters (ystreet00) from comment #1)
> And that works for me with default master.  autovideosink chooses
> glimagesink here (as no Xv ports for xvimagesink) which only takes RGBA. 
> Forcing ximagesink exhibits the problem.
> 
> compositor's negotiation needs fixing to prefer formats with alpha.

It used to prefer formats with alpha only if some sinkpads had an alpha channel
which was the correct behaviour.

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