I use cut-edit function of CloneDVD2 to get a chapter from a title, the output vob files seems to have some error. Some applications like "TMPGEnc Xprsee" can not handle correctly. But I use CloneDVD2 directly to get a title, the output vob files are ok. I use VobEdit to view vob files. Left is a vob file of an entire title by CloneDVD2. Right is a vob file of a chapter from a title by CloneDVD2. I find the vob file of a chapter be added a 8k VOB marked VOBID:1, actual video part marked VOBID:2. I use VobEdit to cut the VOBID:1 part, then get an only VOBID:2 part vob file. "TMPGEnc Xprsee" handle the file correctly. I think the 8k VOB marked VOBID:1 is unnecessary.