6. Video Title Set (VTS)
A group of related video titles having similar display format (standard screen or wide screen) or aspect ratio comprises a video title set (VTS). A single VTS can hold up to 99 titles per VTS. There is practically no limit on the number of PGCs which can be defined per title. A DVD-compliant disc can have up to 99 video title sets. The number of video title sets designed for a project depends on many factors. If the project consists of a single movie title, or one large title with several related but shorter titles, one VTS is sufficient. Multiple video title sets allow more flexibility to organize an authoring project which includes several groups of titles whose contents have different display formats or aspect ratio or represent different topics to the audience.

Each title in a video title set can be a distinct piece of video and audio contents but shares the same root menu, audio language menu, subtitle menu, angle and chapter menu with other titles in the VTS. The root menu of the VTS which contains the currently active title is displayed when the "Menu" button on the user remote control is pressed. The video title set keeps track of the order and physical locations of each title within the VTS, so a title can be referred to as a relative title within the VTS, without reference to titles from other VTSes. This makes VTS-domain instructions simple and efficient to access a local VTS title.

A DVD-compliant Video Title Set is composed of the following files:

1. VTS_nn_0.IFO consists of control and playback information for the video title set nn (where nn is from 1 to 99). This file is required to be present on each VTS.

2. VTS_nn_0.VOB contains the contents required for the root menu and other predefined VTS menus of the video title set nn (where nn is from 1 to 99). This file is not required and may or may not be present (or have a zero file size) on a DVD-compliant disc. Data structures stored in this file belongs to the Video Title Set Menu (VTSM) domain.

3. VTS_nn_n.VOB contains the contents required for all titles present in the video title set nn (where nn is from 1 to 99, and n is from 1 to 9). At least one file VTS_nn_1.VOB is required in the VTS and each VTS_nn_n.VOB file can have a maximum file size of 1 GBytes. Contents stored in these files make up the program streams in the title domain.

4. VTS_nn_0.BUP is an identical copy of VTS_nn_0.IFO. If the DVD player cannot read information from the VTS_nn_0.IFO, it will attempt to get the required information from this backup file. This file is required to be present on a DVD-compliant disc.

Section 13 of the Unofficial DVD Specifications 2.2 Acrobat PDF ebook presents in details all required and optional structures in a Video Title Set. If you do not have a permanent Internet connection, this ebook can save you a lot of connection time by reading it off-line and it contains more information than presented on the web pages. Each DVD instruction is organized as a bookmark so you can get to the desired page of any of the 36 DVD commands with just a click. A DVD command generator is provided so you can generate 100%-compliant DVD commands from your desktop.

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