The VMG is kept in the files VIDEO_TS.IFO/ BUP/ VOB, while titleset nn ( nn ∊ 01. VM jump commands in the VMG can directly address menus and titles in any titleset, while those in titlesets can only address menus and titles within the same titleset or the VMG.Titlesets can contain both menus and titles, while the VMG can only contain menus.There can be one or more titleset domains (VTS), and there will also always be a video manager (VMG) domain. Menus and titles in DVD-Video are grouped into domains. IFO files with the same name, meant to be kept on a physically separate area of the disc, to provide some robustness in the event of physical damage. BUP (“backup”) files are copies of the corresponding. IFO (“info”) files contain information about the menu and title structure. VOB files contain the actual MPEG-format content, while the (much smaller). Inside the VIDEO_TS directory, you will see a bunch of files with names ending in. The latter will have nothing in it it is part of the structure of DVD-Audio discs, which never seemed to become very popular, details of which are not publicly-known. If you look at a DVD-Video disc on a PC, you will see a common directory structure: at the top level, a directory called VIDEO_TS, and probably also one called AUDIO_TS.
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