Enable H.264 Level 5.1 in xvba-video VA API plugin. To enable
this a change must be made in ATI configuration database.

Important notice:
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It is require to enable H.264 Level 5.1 in the fglrx driver
(for the moment AMD Catalyst 12.6):

  aticonfig --set-pcs-u32=MCIL,HWUVD_H264Level51Support,1