The test case for Xv has some more info on this. It seems to suggest using a .ogg file and provides a link to a recommended sample file :
http://fedoraproject.org/wiki/QA:Testcase_radeon_xvideo (Xv test plan)
http://www.redhat.com/v/magazine/ogg/NET_MAN.ogg (file)
http://fedoraproject.org/wiki/QA:Testcase_radeon_xvideo (Xv test plan)
http://www.redhat.com/v/magazine/ogg/NET_MAN.ogg (file)
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