Twin Pass Encoding. to MV file or not MV file

[Master PooBaa]

Im using xmpeg4.5 with divx 5.02.
with twin pass encoding, what exactly does the MVbin file do? and whats the advantages/disadvantages of using it?

[Selur]

Okay, this should go in the divx section, but here u go:
It cotains some motion vetor data from the frist pass so they don't have to be collected in the second pass, which leads to a speed increase but could lower accuracy of the calculations which are done in second pass a bit.

Cu Selur