ok i did several movies from dvd to avi and when i play them normal they are fine , if i fast forward them the sync goes way out any help for this , or is it from the way i did it

smartripper 2.41
dvdx2.0
video codec divx pro 5.02 (1 pass quality based) quantize 4.0 - 8.7
audio codec acm mpeg layer 3 192kbit/s
resolution size 696x480
ntsc 23.98