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38 Everything You Ever Wanted to Know About DVD<br />
The Disc Says Dolby Digital. Why Do I Get<br />
Two-Channel Surround Audio?<br />
Some discs (many from Columbia TriStar) have two-channel Dolby Surround<br />
audio (or plain stereo) on track one and 5.1-channel audio on track<br />
two. Because some studios create separate sound mixes optimized for<br />
Dolby Surround or stereo, they feel the default track should match the<br />
majority of sound systems in use. Unless you specifically select the<br />
5.1-channel track (using the audio button on the remote or the onscreen<br />
menu), the player will play the default two-channel track. (Some players<br />
have a feature to automatically select the first 5.1 track.) Dolby Digital doesn’t<br />
necessarily mean 5.1 channels. (Refer to “Do All Videos Use Dolby Digital<br />
(AC-3)? Do They All Have 5.1 Channels?” and see <strong>Chapter</strong> 3’s “What<br />
Are the Audio Details?”)<br />
Why Doesn’t the Repeat A—B Feature Work on Some Discs?<br />
Almost all features of DVDs, such as search, pause, and scan, can be disabled<br />
by the disc, which can prevent the player from backing up and<br />
repeating a segment. If the player uses a time search to repeat a segment,<br />
a disc with fancy nonsequential title organization may also block the repeat<br />
feature. In many cases, the authors don’t even realize they have prevented<br />
the use of this feature.<br />
What’s the Difference Between First-, Second-,<br />
and Third-Generation DVDs?<br />
This question has no absolute answer, because you’ll get a different<br />
response from everyone you ask. The terms second generation, third generation,<br />
and so on refer both to DVD-Video players and DVD-ROM drives.<br />
In general, they simply mean newer versions of DVD playback devices. The<br />
terms haven’t been used (yet) to refer to DVD products that can record, play<br />
video games, and so on.<br />
According to some people, second-generation DVD players came out in<br />
the fall of 1997, and third-generation players were released at the beginning<br />
of 1998. According to others, the second generation of DVDs will be HD<br />
players (see <strong>Chapter</strong> 2’s “Will High-Definition DVDs or 720p DVDs Make<br />
Current Players and Discs Obsolete?”) that won’t come out until 2003 or so.<br />
Many conflicting variations occur between these extremes, including the<br />
viewpoint that DTS-compatible players, Divx players, progressive-scan
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