Rivergate Software Inc. - makers of DVDAfterEdit

Definitions for a few terms we use in the industry.

Entry PGC

A VMG or VTSM PGC defined as an "entry PGC" means that navigation will arrive at this PGC first when entering the PGC's respective menu domain unless instructed otherwise. This is most important when defining which PGC navigation is directed to when the remote "menu" or "title menu" (aka "top menu") keys are activated.

First Play PGC

This PGC informs the player how to start playing a disc. Commands can be used to set GPRM's, get information about the setup of the player, and direct navigation.

PGC

(Program Chain) The basic object or building block in DVD structure. PGC's can contain instructions and/or video and audio. Menus and tracks are PGC's, and "dummy PGC's" are usually menus used to hold commands without video and audio assets. Think of a PGC as a container.

VMG

(Video Manager) The upper-most level or "domain" of DVD structure; it contains various attributes of a disc that can affect playback, as well as contain menu and dummy PGC's.

VTS

(Video Title Set) Usually holds a DVD's program material, and can be comprised of multiple PGC's. DVD's can have multiple VTS's, much like the tracks of an audio CD. The VTS domain is below or under that of the VMG in regards to the DVD logical structure.

VTSM

(Video Title Set Menu) Each VTS has a dedicated menu area - its own VTSM domain, which can contain multiple menu PGC's. These menus can only control the VTS PGC's in the same VTS domain as the menu. So for example, VTSM 1 can control a track in VTS 1, but not in VTS 2.