Apple DVD Studio Pro 4 - Manual (Page 503)

SPRM 2 value with the stream
selected and display on SPRM 2 value with the stream
selected and display off
Stream number
92 28 29
93 29 30
94 30 31
95 31 32
Similar to SPRM 1, this information is useful to determine the last subtitle stream selected
by the viewer. If you have a menu for subtitle selection, you can use this information to
highlight the corresponding button for the correct subtitle.
SPRM 3: Current Angle Number
Similar to SPRM 1, the DVD specification allows for up to nine multi-angle MPEG video
streams. This SPRM lists the current stream being played or the last one selected by the
viewer.
The value range for this SPRM is 1 through 9, where 1 is the first stream and 9 is the last
stream (the value does not start at 0 as with SPRMs 1 and 2). If there is only one angle,
the default value is 1.
Knowing which multi-angle stream was last selected or played is very useful when
determining which button to highlight when jumping to a menu where multi-angle
streams are selected. This is especially important if the viewer is allowed to change the
multi-angle stream while viewing the movie.
SPRM 4: Current Playing Title Number
Each track, story, and slideshow element in your project is a title. You can have up to 99
titles in your project. All of these are assigned numbers based on their order in the Outline
tab’s By VTS display. SPRM 4 shows the number for the currently playing element.
If your project does not have stories, the VTS number shown in the Outline tab’s By VTS
display matches the SPRM 4 value. Because stories are not placed in their own VTS,
including them in your project affects the SPRM 4 values. For example, you could have
a project with two tracks, with Track 1 in VTS 1 including 2 stories (Story 1 and Story 2)
and Track 2 in VTS 2. The SPRM 4 values for this project are:
• Track 1 = 1
• Story 1 = 2
• Story 2 = 3
• Track 2 = 4
503 Chapter 20 Creating Scripts