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videoaggregator: allow selecting an alpha output from non-alpha inputs

Matthew Waters requested to merge ystreet/gst-plugins-base:videoaggregator-alpha-caps-output into master

e.g. if we have:

video-x/raw,format=I420 ! compositor ! video/x-raw,format=BGRA

This will currently produce a warning as the alpha-ness of the chosen 'best' format (I420) will be different from the value restricted by the downstream caps filter.

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