The vob files are not correct. It's very difficult for you to know the exact length of a MPEG-2 file without parsing the whole of it. Some VOBs make it easy by having a continuous GOP timecode and PTS, but many VOBs don't have this.
There's also no one to navigate very accurately thru MPEG-2 files unless you have some sort of indexing like DVD2AVI does.
-Nic
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