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132 Everything You Ever Wanted to Know About DVD<br />
CD/DVD-ROM driver upgrade from your system manufacturer before<br />
turning DMA on. If the drive disappears, reboot in safe mode, uncheck<br />
DMA, and reboot again. You may have to tell Windows to restore the<br />
registry settings from its last registry backup.<br />
• If you get an error about unavailable overlay surface, reduce the display<br />
resolution or number of colors (right-click the desktop and<br />
choose the Settings tab).<br />
• Try turning off programs that are running in the background. (In Windows,<br />
close or exit applets in the system tray—the icons in the lower<br />
right corner. In Mac OS, turn off AppleTalk, file sharing, and virtual<br />
memory.)<br />
• Allocate more memory to the Apple DVD Player.<br />
• If you are using a SCSI DVD-ROM drive, make sure that the it’s the first<br />
or last device in the SCSI chain. If it’s the last device, make sure it’s terminated.<br />
• Reinstall the Windows bus mastering drivers. (Delete them from the<br />
device manager and let Windows ask for the original disc.)<br />
• Bad video when connecting to a TV could be from too long a cable or<br />
from interference or a ground loop. See “Why Is the Audio or Video<br />
Bad?” in <strong>Chapter</strong> 3.<br />
Can I Stream DVD over a Network or the Internet?<br />
Short answer: Not if the disc is copy protected.<br />
With a fast enough network (100 Mbps or better, with good performance<br />
and low traffic) and a high-performance server, it’s possible to stream<br />
DVD-Video from a server to client stations. If the source on the server is a<br />
DVD-ROM drive (or jukebox), then more than one user simultaneously<br />
accessing the same disc will cause breaks in the video unless the server<br />
has a fast DVD-ROM drive and a very good caching system designed for<br />
streaming video.<br />
A big problem is that CSS-encrypted movies (see “What Are the Copy<br />
Protection Issues?” in <strong>Chapter</strong> 1) can’t be remotely sourced because of<br />
security issues. The CSS license does not allow decrypted video to be sent<br />
over an accessible bus or network, so the decoder has to be on the remote<br />
PC. If the decoder has a secure channel to perform authentication with the<br />
drive on the server, then it’s possible to stream encrypted video over a network<br />
to be decrypted and decoded remotely. (But so far almost no<br />
decoders can do this.)
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