TABLE OF CONTENTS MPEG-1 audio and video compression was developed for storing and distributing digital audio and video. Features include random access, fast forward, and reverse playback. MPEG-1 is used as the basis for the original video CDs (VCD).
The channel bandwidth and image resolution were set by the available media at the time (CDs). The goal was playback of digital audio and video using a standard compact disc with a bit rate of 1.416 Mbps (1.15 Mbps of this is for video).
MPEG-1 is an ISO standard (ISO/IEC 11172), and consists of six parts:
| system | ISO/IEC 11172-1 |
| video | ISO/IEC 11172-2 |
| audio | ISO/IEC 11172-3 |
| low bit rate audio | ISO/IEC 13818-3 |
| conformance testing | ISO/IEC 11172-4 |
| simulation software | ISO/IEC 11172-5 |
The bitstreams implicitly define the decompression algorithms. The compression algorithms are up to the individual manufacturers, allowing a proprietary advantage to be obtained within the scope of an international standard.
JPEG (ISO/IEC 10918) was designed for still continuous-tone grayscale and color images. It doesn't handle bi-level (black and white) images efficiently, and pseudo-color images have to be expanded into the unmapped color representation prior to processing. JPEG images may be of any resolution and color space, with both lossy and lossless algorithms available.
Since JPEG is such a general purpose standard, it has many features and capabilities. By adjusting the various parameters, compressed image size can be traded against reconstructed image quality over a wide range. Image quality ranges from "browsing" (100:1 compression ratio) to "indistinguishable from the source" (about 3:1...
