I got this crash report in Virtualdubmod when trying to convert wmv to avi (XviD) in 2-pass. I had no problems with a single pass conversion. I never had a 2-pass conversion (wmv or other) crash before. Using current XviD version. I use regular script I always use to import wmv into Virtualdubmod:

Directshowsource("C:\filename.wmv", audio=false, fps=29.97)