utvideoenc: use ff_generate_len()
19% faster smaller files this may also fix possible integer overflows due to previous 32bit useage Tested with libutvideo and our utvideo decoder, this patch does not change decoder output in the test Reviewed-by: NDerek Buitenhuis <derek.buitenhuis@gmail.com> Signed-off-by: NMichael Niedermayer <michaelni@gmx.at>
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