pbutils: handle more H.264 profiles and levels.
Recognize H.264 Level 5.2, as exposed by modern 2160p30+ streams, i.e. commonly known as 4K. Also add initial support for handling Annex.G (SVC) profiles. https://bugzilla.gnome.org/show_bug.cgi?id=732269 Signed-off-by: Gwenole Beauchesne <firstname.lastname@example.org>
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