The MPEG standard MPEG-1, adopted in 1992, is an integrated standard for storing video and audio on a compact disc( CD) at a data rate of 1.5 Mbps. MPEG-1 operates at a resolution of 352 x 288 pixels and a refresh rate of 25 Hz, which corresponds to the European CIF representation format, Common Intermediate Format (CIF), and the SIF representation format, Source Input Format (SIF).
The resolution results from the quality requirement, which for MPEG-1 should correspond to the VHS system. Since television works with two fields that together form a frame, the vertical resolution is assumed to be that of a field. In the PAL television standard, 575 of the 625 lines are visible, giving 288 per field, and 352 pixels for the horizontal.
MPEG compression for video uses complex coding that exploits temporal and content image redundancies for data compression. With MPEG-1, video signals can be compressed so that they are transmitted at a resolution of 352 x 288 pixels and a frame rate of 25 frames per second, with data rates between 1.2 Mbps and 3 Mbps. This corresponds to a compression of about 20:1.
MPEG-1 is defined in the ISO/ IEC 11172 standard. In addition to video compression, MPEG-1 audio provides two audio channels for which bitstreams of 96 kbit/s, 128 kbit/s and 192 kbit/s are available, depending on the MPEG-1 variant.