User Guide

Glossary 315
BUP file Backup copy of the IFO file on a DVD-Video disc.
button Graphic object on a DVD menu that links to a video clip or another menu. When a
viewer selects and activates the button, the DVD player displays the linked material.
In DVD menus, a highlight indicates which button is selected—the viewer uses the remote
control to move the highlight to the desired button and presses ENTER to display the linked
clip or menu. In VCD menus there is no highlight; the viewer selects a button by pressing its
button number on the remote control.
byte Unit of data containing eight bits. Digital data storage is usually measured in bytes,
whereas digital data rates are usually measured in bits (per second). See also KB, MB, GB.
capturing Process of recording video or images onto digital media such as a hard disk or
DVD.
CBR encoding (Constant Bit-Rate Encoding) Method of encoding MPEG video streams by
allocating the same number of bits to every second of video, regardless of its complexity.
Redundant data is added to the stream when there is little action, and greater compression
is applied (resulting in lower quality) as the video complexity increases. Compare with VBR
encoding.
CD (Compact Disc) Optical disc storage format developed by Philips and Sony, originally for
digital audio only. The CD format was extended to include computer files (CD-ROM) and
video (VCD).
cDVD Low-cost DVD format developed by Sonic. DVD-Video files are recorded on a CD-R or
CD-RW disc and played back using a PC-based DVD player.
cDVD is not part of the formal DVD specification and only a very few set-top DVD players
can play cDVD discs (though this number may increase in the future). Most set-top players
(those that can read a CD-R/RW disc) look for audio or VCD data and, when they fail to find
it, either do nothing or eject the disc.
CD-R (Recordable Compact Disc) Compact discs that can be recorded once.
CD-RW (Rewritable Compact Disc) Compact discs can be recorded and erased up to 1,000
times.