12 Facts About MPEG-1

MPEG-1 is a standard for lossy compression of video and audio.

In July 1990, before the first draft of the MPEG-1 standard had even been written, work began on a second standard, MPEG-2, intended to extend MPEG-1 technology to provide full broadcast-quality video at high bitrates and support for interlaced video.

The near-complete draft of the MPEG-1 standard was publicly available as ISO CD 11172 by December 6,1991.

MPEG-1 Systems specifies the logical layout and methods used to store the encoded audio, video, and other data into a standard bitstream, and to maintain synchronization between the different contents.

MPEG-1 videos are most commonly seen using Source Input Format resolution: 352×240,352×288, or 320×240.

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MPEG-1 has a unique frame type not found in later video standards.

MPEG-1 operates on video in a series of 8×8 blocks for quantization.

MPEG-1 video uses a motion vector precision of one half of one pixel, or half-pel.

MPEG-1 actually uses two separate quantization matrices, one for intra-blocks and one for inter-block so quantization of different block types can be done independently, and so, more effectively.

Several steps in the encoding of MPEG-1 video are lossless, meaning they will be reversed upon decoding, to produce exactly the same values.

MPEG-1 Audio utilizes psychoacoustics to significantly reduce the data rate required by an audio stream.

MPEG-1 Audio Layer I is a simplified version of MPEG-1 Audio Layer II.