Apple DVD Studio Pro 4 - Manual (Page 408)

You can also start the Simulator from a specific story entry.
To simulate a story entry
Do one of the following:
µ
Select the story entry in the Story Editor, then choose File > Simulate Story Entry, or press
Command-Option-0 (zero).
µ
Control-click the story entry, then choose Simulate Story entry from the shortcut menu.
Once the story starts playing, you can use the Simulator’s controls to choose the streams
to view (angle, audio, and subtitle).
See Simulating Your Project for information on using the Simulator.
Adding Alternate Video Streams
One feature unique to the DVD medium is the viewer’s ability to switch between parallel
video streams with continuous audio. Only one video stream at a time can serve as the
active stream, but there can be as many as eight alternate streams, for a total of nine
“camera angles.” These can be different camera views, or angles, of the same subject, or
they can be any other video sources.
For example, a concert video could use different camera angles for the alternate video
streams, with cameras focusing on each musician. Stream V1, the main video stream,
could be an edited version of all angles while streams V2 to V9 could be unedited versions
of each musician. This would allow the viewer to choose whether to see the whole concert
or focus on a specific aspect of it.
In another example, the V1 stream could contain the normal view of a business
presentation, including the presenter, and the presentation’s slides could be displayed
up close on the V2 stream.
Multi-Angle and Mixed-Angle Tracks
DVD Studio Pro allows you to create either multi-angle or mixed-angle tracks. With a
multi-angle track, the alternate video streams are the same length as the main stream. A
mixed-angle track uses partial alternate video streams.
Authoring with multi-angle video is an exciting capability of the DVD medium, though
there are some disadvantages, the main one being that multi-angle video streams consume
a great deal of disc space. A DVD capable of holding 120 minutes of video has its play
time reduced to 60 minutes if there are two video angles (120 divided by 2), and to
13.3 minutes if there are 9 video angles.
408 Chapter 17 Creating and Editing Tracks