ffv1dec: check that global parameters do not change in version 0/1
Such changes are neither allowed nor supported Found-by: ami_stuff Bug-Id: CVE-2013-7020 CC: libav-stable@libav.org Signed-off-by: Anton Khirnov <anton@khirnov.net> (cherry picked from commit da7d839a ) Signed-off-by: Anton Khirnov <anton@khirnov.net>
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67134ad3
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