Requantize MPEG-2 streams without recompressing. M2VRequantiser
accepts raw MPEG2 video data (not VOB) from standard input and
writes the recompressed frames to standard output.

Usage is :
	M2VRequantiser recompression_factor inputM2Vsize <input.m2v >output.m2v

WWW: https://launchpad.net/m2vrequantiser