Apple DVD Studio Pro 4 - Manual (Page 74)

Audio files created by the embedded AIFF encoder use the original filename with an
added “.aiff” extension.
Encoding Video for Multi-Angle Tracks
DVD Studio Pro supports multi-angle and mixed-angle video. With multi-angle video, a
track can contain up to eight alternate video streams that last the entire length of the
main stream (for a total of nine video streams per track). With mixed-angle video, the
alternate streams do not last the entire length of the main stream, so you can have
alternate streams in only those locations where they are needed, saving disc space. In
either case, the viewer can switch among angles using the Angle button on the remote
control.
Because different MPEG encoders can produce slightly different GOP structures, you
should use the same encoder for all streams.
Note: Switching angles while playing a DVD affects only the video playback. The audio
remains on the currently selected stream.
Considerations for Mixed-Angle Tracks
Mixed-angle tracks provide the possibility of interesting playback scenarios. The illustration
below shows a track that has two sections with three alternate angles, with playback set
to angle 3.
Angle
1
2
3
4
Mixed-angle track with stream 3 playing
There are some additional considerations when creating a mixed-angle track:
• Within a track, you can use markers to define multiple sections to use additional angles,
but each section must have the same number of streams. For example, you cannot
have one section early in the track with two alternate streams and a section later in
the track with three alternate streams—both sections must have either two or three
streams.
• Each alternate angle section can be a different length, but all streams within a section
must be the same length. For example, you can have one mixed-angle section early in
the track that is 10 seconds long and a second mixed-angle section that is 20 seconds
long. All alternate streams in the first mixed-angle section must be 10 seconds long;
all alternate streams in the second mixed-angle section must be 20 seconds long.
74 Chapter 4 Preparing Video Assets