cmp=<0-2000>
Sets the comparison function for full pel motion estimation

subcmp=<0-2000>
Sets the comparison function for sub pel motion estimation

mbd=<0-2> (also see *cmp, qpel)
Macroblock decision algorithm (high quality mode), encode each macro block in all modes and choose the best.
This is slow but results in better quality and file size. When mbd is set to 1 or 2, the value of mbcmp is
ignored when comparing macroblocks (the mbcmp value is still used in other places though, in particular the
motion search algorithms). If any comparison setting (precmp, subcmp, cmp, or mbcmp) is nonzero, however, a
slower but better half-pel motion search will be used, regardless of what mbd is set to