Dvd Structure

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• VIDEO_TS.IFO VIDEO_TS.VOB VIDEO_TS.BUP: This is the information for the main menu, and the VMG (video manager) information file
• The main menu is in the vob file
• The bup file is a backup (copy) of the ifo file
• The IFO is very important for determining how to play the movie.
  • it contains pointers to all the data locations in the VOB or set of VOBs
  • the data in the VOB is resilient to scratches and stuff, so it's not so bad if that gets scratched up
  • but if you lose an IFO... you're toast.
• On the dvd is a collection of titles
• Each title has a menu, and the vob title set.

• Each title set has a main menu for the set and the ifo for the set
• VTS_01_0.IFO VTS_01_0.VOB VTS_01_0.BUP
• that's the menu and the info for the set
• Then, you get the data: VTS_01_[1-9].VOB
• each of those files is only a gig, but that's a filesystem limit
• in actuality, all the data is contiguous on the disc
• and you load it from the first sector of the first vob in the set and keep reading
• even further, everything from the first ifo in the set is contiguous on the disc.
• (you need to know that, since alot of info is given in sectors)
• in the vob set, it's split up in different ways
• but probably the best way to think of it is as a collection of VOBUs
• and then you can organize VOBUs into cells, cells into programs, ...
• each VOBU is a collection of packs
• a pack is 2048 bytes, the size of a sector on a DVD

MoinMoin 1.108, Copyright © 2000-2001 by Jürgen Hermann

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