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SVCD

SVCD, (Super Video Compact Disc abbreviation) is a digital format for video storage on standard compact discs. SVCD was intended as a successor to VCD, and alternative of DVD video. SVCD falls the location between both in terms of techincal capability and image quality.

SVCDs are autthed SVCDs are authored (or "burned") using the CD-ROM mode 2/XA format, allowing roughly 800 megabytes of data to be stored on one 80 minute CD (versus 700 megabytes when using mode 1). One CD can hold a minimum of 35 minutes of full quality SVCD-format video and audio. No maximum length is mandated by the specification. However, the video bit rate, and therefore quality, must be reduced in order to accommodate longer videos.

SVCD Container

Video

Codec: MPEG-2
Resolution: 480x480 for NTSC, and 480x576 for PAL
Aspect Ratio: 4:3 / 16:9.
Bit rate: Up to 2,600 kilo bits.
Rate control: Constant or variable bit rate.

Audio

Codec: MPEG-1 Audio Layer II
Frequency: 44,100 Hz
Bitrate: from 32 to 384 kilobits per seconds
Rate control: Constant and variable bit rate

As with most compact disc-based video formats, SVCD audio is incompatible with the DVD-Video standard due to the difference in frequency; DVDs require 48 kHz, whereas SVCDs use 44.1 kHz. Variable bit rate encoding, while not supported by the MPEG-1 Audio Layer II standard, is part of the SVCD specification. However, variable bit rate audio is not consistently supported by standalone players, and thus the format is rarely used.

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