Sun Microsystems 2.1 manual Media Stream Manager

luminance A matrix, block, or single sample representing a monochrome representation of the signal. Luminance is related to the primary colors in the manner defined in the bit stream. The symbol for luminance is Y. Luminance is distinguished from chrominance.

Media Stream Manager

(MSM) An RPC-based API that provides users with a means of interacting with a media server without coming close to the details of media file storage and the scheduling and delivery of media streams. The MSM supports VCR-like operations such as play-a-title and fast-forward, and video-editing functions such as insert-a-title-in-a-playlist. The MSM is described in detail in the Sun MediaCenter Server Programmer’s Guide.

MPEG Moving Picture Experts Group. MPEG-1 and MPEG-2 are international standards for the compression used in the conversion of analog to digital video, including both video and audio data. With MPEG-1, the ratio of the storage size of compressed to uncompressed digital video is 1:100. MPEG-2 extends MPEG-1 standards; it is intended to meet the needs of television broadcast studios. MPEG-2 approximately doubles the compression available in MPEG-1.

NTSC National Technical Standards Committee. An analog video-format standard used in the United States, Canada, Japan, and Mexico. The NTSC format specifies 525 scan lines and a frame rate of 30 frames/sec. NTSC, PAL, and SECAM are the three video formats used throughout the world.

PAL Phase Alternation Line. An analog video-format standard used mostly in Western Europe. The PAL format specifies 625 scan lines and a frame rate of 25 frames/sec. PAL, NTSC, and SECAM are the three video formats used throughout the world.

pixel picture element

playlist In the Media Stream Manager (MSM), a list of titles to be played, annotated with a relative time at which the title should be played.

play position In a Media Stream Manager (MSM) environment, the current position within a playlist from which isochronous data is being delivered.

SECAM Sequential Couleur A Memoire. An analog video-format standard used in France, Russia, and Eastern Europe. As with the PAL format, SECAM specifies 625 scan lines and a frame rate of 25 frames/sec. However, SECAM encodes video information differently from PAL encoding. SECAM, NTSC, and PAL are the three video formats used throughout the world.

session A period of interaction with a server delimited by the Media Stream Manager (MSM) functions msmServerOpen() and msmServerClose().

stream The representation of the delivery of an isochronous bit stream to a destination.

Glossary-2Sun MediaCenter Server Administrator’s Guide • December 1997