4.11. Predefined VTS Menus
There are five predefined menus available in each language unit. The following menus are predefined PGCs which can be linked to by other PGCs from the First-Play, Video Manager domain, or from the title domain of the same VTS. Each menu can be designed as a still picture page or a video motion background. For complex menu navigation requirements, additional menu pages can be added as entry PGCs in the associated VTSM domain.

Root Menu - designed for top-level access to other menus in the VTS.
Chapter Menu - designed to access chapters within a movie title.
Angle Menu - designed to set up or select different versions of a movie title.
Audio - designed to set up or select the preferred audio language.
Subpicture - designed to set up or select the preferred subtitle language.

4.12. VTS Menus and Remote Control Operation

The above illustration shows the mapping of common remote control buttons to the appropriate pre-defined menus in the VMG and VTSM domain. JumpSS is the virtual command used to perform the required operation. In the VMG domain, JumpSS TitleMenu is used to dislay the title menu.

In the VTSM domain, JumpSS VTS 1:Root Menu is used to display the root menu of a specified VTS.

JumpSS VTS 1:Audio Menu is used to display the audio menu of a specified VTS.

JumpSS VTS 1:Angle Menu is used to display the angle menu of a specified VTS.

JumpSS VTS 1:Sub-picture Menu is used to display the sub-picture menu of a specified VTS.

JumpSS VTS 1:Chapter Menu is used to display the chapter menu of a specified VTS.

Most DVD players display a small symbol at the top left corner of the screen to indicate a prohibited operation if pressing the Menu key and the Root Menu of the current VTS is not present. Pressing Angle, Sub-picture, or Audio key on the remote control selects the next available video angle, language subtitle, or audio stream, respectively, if the corresponding angle menu, sub-picture menu, or audio menu is not present on the disc.