Hi. I had this problem, ad I cannot understand if it's a random occurrence and/or if it can be solved. I was ripping a movie for backup purposes. The problem is that the ripping was incomplete: the #1 VOB file was 6 kb long, and the movie was missing the first 22' of time. Strangely, the ripped part was OK and I managed to extract the audio (with VOBEdit, DVD2AVI didn't work because it tried to get the whole movie's sound and the first part of the WAV file was blank) and to 'merge' it in-sync with the video part, after uncompressing it AC3 --> WAV with HeadAC3he).
But the movie missed the first 22'. What did I do wrong? Can I prevent this? Maybe I have to try to repeat the ripping process untill all the VOBs are extracted fully?