MPEG-1 is a standard for lossy compression of video and audio. It is designed to compress VHS-quality raw digital video and CD audio down to about 1.5 Mbit/s (26:1 and 6:1 compression ratios respectively)[2] without excessive quality loss, making video CDs, digital cable/satellite TV and digital audio broadcasting (DAB) practical.[3][4]

Quick facts: Filename extension, Internet media type,...
Moving Picture Experts Group Phase 1 (MPEG-1)
Filename extension
.dat, .mpg, .mpeg, .mp1, .mp2, .mp3, .m1v, .m1a, .m2a, .mpa, .mpv
Internet media type
audio/mpeg, video/mpeg
Developed byMPEG (part of ISO/IEC JTC 1)
Initial release6 December 1991; 30 years ago (1991-12-06)[1]
Latest release
ISO/IEC TR 11172-5:1998
October 1998; 24 years ago (1998-10)
Type of formataudio, video, container
Extended fromJPEG, H.261
Extended toMPEG-2
StandardISO/IEC 11172
Open format?Yes
Free format?Yes
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Today, MPEG-1 has become the most widely compatible lossy audio/video format in the world, and is used in a large number of products and technologies. Perhaps the best-known part of the MPEG-1 standard is the first version of the MP3 audio format it introduced.

The MPEG-1 standard is published as ISO/IEC 11172 – Information technology—Coding of moving pictures and associated audio for digital storage media at up to about 1.5 Mbit/s.

The standard consists of the following five Parts:[5][6][7][8][9]

  1. Systems (storage and synchronization of video, audio, and other data together)
  2. Video (compressed video content)
  3. Audio (compressed audio content)
  4. Conformance testing (testing the correctness of implementations of the standard)
  5. Reference software (example software showing how to encode and decode according to the standard)