Sun Microsystems 2.1 manual Glossary

Glossary

This glossary contains general, multimedia-related terms, as well as terms specific to the Sun MediaCenter product. Words and phrases in the latter category are indicated as such.

access control list A list of users and the associated operations they are allowed to perform. An access control list is a feature of the Media Stream Manager (MSM).

analog video Video based on a continuous electrical signal. Distinguished from digital video, which is based on the periodic sampling of discrete components of a signal.

B-frameA highly compressed bi-directional frame used in MPEG encoding. B-frames allow MPEG files to be played in reverse and play a role in MPEG’s higher compression than other video compression schemes.

chrominance A matrix, block, or single sample representing one of the two color difference signals related to the primary colors in the manner defined in the bit stream. The symbols for chrominance are Cr and Cb. Chrominance is distinguished from luminance.

CIF Standard for resolution based on the throughput speed of compact disc drives. At CD-drive throughput (1.15 MB/sec.), a true-color (24 bits/pixel) video clip playing at 30 frames/sec. has a resolution size of 352 by 240 pixels. Resolution effects image size, as the image appears on a video display.

composite An analog video signal composed of both luminance and chrominance.

component A matrix, block, or single sample from one of three matrices (luminance and two chrominance) that make up a picture.

content package Required input format for the Sun MediaCenter server. A content package contains one Table of Contents (TOC) file, plus index and data files that make up a movie. The smc_tar utility installs a content package so that it is accessible to MSM clients, through the TOC file. See Chapter 2 “Preparing and Loading Content,” for details on content packages.

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