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This could overflow and crash at least on 32 bit systems.
Reviewed-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit b737a2c5)

Conflicts:

	libavformat/mpc8.c
(cherry picked from commit 49dd89f9

)
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>