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DVD-Video Disc Structure

DVD-Video titles consist of a hierarchical structure as illustrated below. A DVD-Video disc is divided into Video Title Sets (or titles). As a minimum there will be one Video Manager (VMG) and one VTS. A disc containing a movie plus documentary about the making of the movie is likely to be divided into two titles. A disc containing six episodes of a TV programme would be divided into six titles. However in both cases it is possible to have only one title per disc.

Each Video Title Set Information (VTSI) comprises control data and Video Objects (VOB's) for both menus (if present) and titles (stills and video). Each VOB (the fundamental file element of the disc) comprises video, audio, subpictures and navigation data. When a VOB is played the player not only plays the video sequentially but obeys the navigation instructions for displaying menus, getting user selections etc.

Each VOB comprises individual cells linked together by Program Chains (PGCs), which provide the necessary interactivity using a simple programming language developed for DVD-Video. PGCs are used to control the playing of video, audio and subtitles in VOBs, to display menus and input and obey user commands. There are three types of PGC: sequential play, random play and shuffle play. Individual cells may be used by more than one PGC, which can define different sequences through the video content, for example to implement seamless branching. PGCs allow a command set for simple programming including mathematical and logical operators, conditional branching, countdown timer etc. There are 16 general registers for more complex programming and 24 system registers.

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