well, I know this is a very old thread.But I just learn some related information, so I'd like to post here. If disturbing, I am sorry.
When you open a DVD disc, usually you will find two folders there: AUDIO_TS and VIDEO_TS. AUDIO_TS folder is generally empty because it is used primarily for DVD-Audio. While VIDEO_TS folder contains files with BUP, VOB, and IFO extension. All of them play respective important roles so that a DVD player can recognize them and play DVD smoothly.
Source from
http://www.videoconverterfactory.com...converter.html
VOB (Video OBjects): VOB is the container format in DVD-Video media, which contains digital video & audio, subtitles, DVD menus and navigation contents multiplexed together into a stream form.
IFO (InFOrmation): IFO file is an important document to control the VOB file playback process.
BUP (BackUP): The BUP file is exactly the same as the IFO file, which is a backup of the IFO file.
Then how about convert VOB, you can check the above source
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