Apple DVD Studio Pro 4 - Manual (Page 446)

Closed Caption Capabilities
Closed captions provide not only dialogue text but also descriptions of other sounds that
are part of a scene (such as a phone ringing or a dog barking). They are intended to
enhance the viewing experience for deaf and hearing-impaired viewers.
To view closed captions, you must have a suitable decoder—either built in to the television
or as a standalone device. When creating closed captions, you choose the text’s position
and, in some cases, its color—the font is controlled by the decoder.
Because a lot of computers do not have closed caption decoders, playing DVD titles on
them means you generally cannot count on being able to show any included closed
captions.
Due to their reliance on information contained in line 21 of the video signal, closed
captions, as supported by the DVD specification, apply to NTSC programs only.
See Adding Closed Captions to a DVD for details on importing a closed caption file.
Subtitle Stream Basics
There are several aspects of working with subtitle streams that apply whether you create
them in DVD Studio Pro or import them.
Working with Subtitles in DVD Studio Pro
Working with subtitles in DVD Studio Pro involves using the Track Editor, the Subtitle
Inspector, and the Viewer tab.
All subtitles, whether created with text entered in DVD Studio Pro, as individual imported
graphics files, or as a subtitle file containing multiple subtitles, are based on subtitle clips
in one of the 32 subtitle streams. In general, you work with the subtitle clips the same
way you work with audio clips in the Track Editor. You can drag the clips to change their
position and drag their edges to change their length.
The Subtitle Inspector provides the settings you use to configure each of the subtitle
clips. Even the subtitle clips you import as part of a subtitle file can have their settings
modified in the Subtitle Inspector.
The Viewer tab serves the Subtitle Editor function. When you double-click a subtitle clip
in the Track Editor, its playhead jumps to the subtitle clip’s start, with the subtitle appearing
over the track’s video. You can enter and position subtitle text directly in the Viewer tab.
It also contains the tools you use when you create subtitles configured for buttons over
video.
446 Chapter 19 Creating Subtitles