avcodec/mpegvideo: use predefined M_PI
M_PI is defined in math.h, or in avutil/mathematics.h for compatibility hacks. This uses this value instead of an ad-hoc floating literal. Reviewed-by: NMichael Niedermayer <michael@niedermayer.cc> Signed-off-by: NGanesh Ajjanagadde <gajjanagadde@gmail.com>
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