In Ubuntu 15.04 with default catalyst 15.3 not working XVBA and VAAPI.
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There seems to be an internal xvba-vaapi conversion beginning from Catalyst 14.12, so it appears as supporting vaapi for applications. This means that after installing fglrx acceleration should just work without requiring anything else. You can check the state by typing "vainfo" into a terminal. I think the xvba package can still be used optionally, as some programs may want to talk through the old xvba interface. It's kept for backwards compatibility, but no longer a requirement.