Question about MV/Log Files

[Chu]

Hello all, quick question. I'm about 12 hours into the first pass of a 2 pass encode of a movie. Well, the movie needed to be cropped, and I now realize the cropping is a couple pixels off.

The question is this. Under divx 3/4, this really wouldn't be a big issue since the divx.log file mostly stores scene information that wouldn't really be effected by a 2x384 and a 1x512 bar of black.

The problem is, I have no clue what is going into the MV file. I know it is some sort of motion, but is it key to how the B-Frame algorithm generates frames (i.e. 2 pixels matters because it would screw up the macroblocks), or is it something else that this 2 pixel bar wouldn't effect?

If this 2 pixel bar will screw up the MV file enough that it is ununusable, what happens if I do a second pass with the 'Use MV file' option unchecked?

Thanks in advance,

-Chu

[Acaila]

Two pixels can make a lot of difference, because something that might have been a macroblock by itself before could now be divided into parts of two macroblocks. And since motion vectors are based on the location of each macroblock, it will probably screw up everything.

But if like you said you disable the MV usage on the second pass the problem might not be visible since the motion vectors are now calculated anew.