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MacEtVideo
VideoHelp
Forum Mac-Video
 
Navigation commands
By Jérôme Cabanis
English Translation by Annette Appleton
For myDVDEdit version 1.0
Last updated: Mar 24 Mar 2009, 21:10

Index du Forum -> Documentations/Tutoriels

 

This documentation describes the different navigation commands that can be used in a DVD.

You'll learn the different types of navigation commands, how they work and when they can be used.

The Domains

One essential notion to understand about a DVD, is the notion of domain.
There are four types:

• First Play
• VMG Menu
• VTS Menu
• VTS

Although First Play and VMG Menu domains are unique, there are as many different VTS Menus and VTS domains as there are VTS files.

It isn't always possible to go from one domain to another. An extreme example of this, is that it is impossible to go directly from a VTS x to a VTS y. One is forced to go via a PGC in the VMG Menu.

Jump and Call Commands

These are used to go from one domain to another.

In my instructions:

x represents a PGC number.
n represents a VTS number.
entry represents a type of PGC entry (root, subpicture, audio, angle ou chapter).
tt is a title number (a DVD title).
vtstt is the number of the VTSTitle (a VTS title).
ch is a chapter number.


Navigation from First Play

 

 
 Jump VMG Menu title
 Jump VMG Menu Pgc x
 Jump VTS Menu n, Menu entry
 Jump Title tt

 





Navigation from VMG Menu

 
 Jump VMG Menu title
 Jump VMG Menu Pgc x
 Jump VTS Menu n, Menu entry
 Jump Title tt
 Jump First Play

 





Navigation from VTS MENU

 
 Jump VMG Menu title
 Jump VMG Menu Pgc x
 Jump First Play
 Jump VTSTitle vtstt
 Jump VTSTitle vtstt, Chapter ch
 Jump VTS Menu entry

 





Navigation from VTS

 
 Call First Play
 Call VMG Menu title
 Call VMG Menu Pgc x
 Call VTS Menu entry
 Jump VTSTitle vtstt
 Jump VTSTitle vtstt, Chapter ch

 





Link Commands

Link Commands are used to navigate to another element in the current domain.
Permitted Link commands depend on the domain as well as on the location of the command. Therefore a command can be in Pre-commands, Post-commands, Cell Commands or in a button, and depending on its location this dictates whether or not a type of Link is possible.

Since First Play has only one PGC, with no Cell possible, there is therefore no Link command available for this domain.

When navigation is towards a PGC, Pre-commands are executed, however, when navigation is to a Cell, a Program or Chapter, this occurs instantly without first executing Pre-commands.

 

Link Pgc x
Navigation towards another PGC in the current domain. This can be used everywhere (except in First Play, of course).

Link Prgm x
Displays the specified Program in the current PGC.

Link Cell x
Displays the specified Cell in the current PGC.

Link Chapter x
Displays the specified Chapter in the current PGC. Since only title's PGC can have Chapters, this Link command can only be used in VTS.

Link TopCell
This Link restarts the display of the current Cell. It can only be used in a Cell Command or a button.

Link NextCell
Displays the next Cell in the current PGC. It can only be used in a Cell Command or a button.

Link PrevCell
Displays the previous Cell in the current PGC. It can only be used in a Cell Command or a button.

Link TopPrgm
This Link restarts the display of the current Program. This can only be used in a Cell Command or a button.

Link NextPrgm
Displays the next Program in the current PGC. It can only be used in a Cell Command or a button.

Link PrevPrgm
Displays the previous Program in the current PGC. It can only be used in a Cell Command or a button.

Link TopPgc
This Link restarts the current PGC. It can only be used in a Cell Command or a button.

Link PrevPgc
Navigation to the PGC marked as being the previous one to the current PGC (see the PGC Information tab). This can only be used in a Cell Command or a button, of a title PGC in a VTS domain.

Link NextPgc
This Link connects to the PGC that comes after the current one. (see the PGC Information tab). It can only be used in Cell Command or a button, from a title PGC in a VTS domain.

Link GoUpPgc
This Link connects to the PGC that is assigned to the GoUp of the current one. (see the PGC Information tab). It can only be used in Cell commands or a button.

Link TailPgc
This Link connects to the Post-commands of the current PGC. It can only be used in a Cell command or a button.

 

The Resume Command

Normally, Resume is part of the Link commands, but I thought it best to discuss it separately because it is so specific.

It permits the video to play from the same position that it was stopped by a Call or by pressing the Menu button on the user's remote control

The destination is not limited to the current domain.
It can only be used in the VMG Menu domain or in the VTS Menu domain.

 

The Goto Command

The Goto command allows you to jump to a specific line in the current PGC. This command can only be used in the Pre-commands or Post-commands.

One question that comes up a lot is: Why can't you use a Goto command in the Cell commands?
It's a common mistake to believe that the Cell commands are the same as the Pre-commands and the Post-commands, and that when the DVD player has finished executing a Cell command, it goes straight to the next one. This is not so. In fact, you can only attribute a single line of Cell commands to a Cell, and only one. You should think of the Cell commands as being more like the Button commands, in that they are unique and non-sequential. The Cell Command tab merely proposes a list of possible commands for the Cells, without having a specific link between each command.

 

The Break Command

The Break command allows you to interrupt the execution of commands. It is equivalent to a Goto at the end of all commands. It can only be used in Pre-commands and Post-commands.

 

The Exit Command

The Exit command interrupts the playing of the DVD.

 


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