Navigation Control Data (Windows Embedded CE 6.0)
1/6/2010
The audio and video data on a DVD-Video disc is interleaved with various kinds of navigation control data.
This data may be instructions that tell the player to do something, for example move to some particular place on the disc, or they may be information-only markers informing the player that the content that follows has a higher parental management level than the previous content or that the chapter skip operation is disabled.
The player relays this information to an application, and it is the responsibility of the application to act on it. These navigation markers are part of what give DVD-Video its high level of user interactivity.
A DVD-player application must handle events that originate with the disc as well as events that originate with the user.