Apple DVD Studio Pro 4 - Manual (Page 582)

It is the second layer’s direction that you have to choose. With the Parallel Track Path
(PTP) setting, the second layer is configured exactly like the first layer—it begins on the
inside and plays toward the outside. With the Opposite Track Path (OTP) setting, the
second layer begins on the outside edge and plays toward the inside.
Note: Double-layer discs require you to use the OTP setting.
With the PTP setting, the DVD player will need more time when switching between layers
because the laser must be repositioned from one end of the disc to the other. Using the
OTP setting minimizes the time needed to reposition the laser because the end of the
first layer is near the beginning of the second layer.
Important: When using the OTP setting, the first layer must be larger than the second
layer.
About Choosing a Dual-Layer Break Point
Several factors need to be taken into account when you choose where to place the
dual-layer break point:
• Break points must be on track markers: When you choose the break point, you get a list
of track markers to choose from. In some circumstances, you may need to place a
marker on a track just for this purpose. See
Setting the Dual-Layer Break Point for more
information.
Note: In some special cases, you can set your dual-layer break point in the DVD-ROM
area. See
Setting the Break Point with Large DVD-ROM Contents for more information.
• Break points need to be placed so that the first layer is mostly filled: A red laser dual-layer
disc can hold 7.95 binary gigabytes and a blue laser dual-layer disc can hold 27.94
binary gigabytes. (See
Making Sure Your Content Will Fit for information on disc sizes
and DVDs.) Each red laser disc layer can hold approximately 3.9 binary gigabytes, and
each blue laser disc layer can hold approximately 13.9 binary gigabytes. The closer your
project comes to filling the disc, the more critical it is that you get as much content as
possible on the first layer, and place the break point accordingly. Additionally, using
the OTP direction setting requires the first layer to be larger than the second layer. See
Manually Determining the Break Point Position for information on determining at which
track the first layer will be filled.
• Break points are best when they are not noticed: A layer switch that occurs during a tense
action-packed scene can disrupt the viewer’s attention. When possible, it is best to
place the break point in a scene with little action, or even better, at a scene transition,
such as a fade to black.
582 Chapter 22 Finishing a Project