MPEG-1

File Format
Name	MPEG-1
Ontology	Electronic File Formats Video MPEG MPEG-1
Extension(s)	.mpg, .mpeg, .mp1, .mp2, .mp3, .m1v, .m1a, .m2a, .mpa, .mpv
MIME Type(s)	audio/mpeg, video/mpeg
LoCFDD	fdd000035, fdd000012
PRONOM	x-fmt/385, fmt/649
Released	1992

MPEG-1 is a video and audio compressed stream standard which is part of the MPEG group of standards. It can be used in a variety of containers, resulting in various file types including the popular MP3 audio format (which is based on Layer 3 of MPEG-1, and also Layer 3 of MPEG-2).

The later MPEG-2 standard is an extension of MPEG-1.

The ISO/IEC-11172 group of standards, published between 1993 and 1998, give the details of the specifications.

This standard is old enough that any patents that may have encumbered it in the past are now expired. US patents 4,472,747 and 5,214,678 are such possibly-related but expired patents. Since MP3 audio uses things from MPEG-2, there are still some unexpired patents relevant to that.

Formats

There are separate articles for these formats:

• MP3
• MPEG Audio Layer I (MP1)
• MPEG Audio Layer II (MP2)
• MPEG Elementary Stream
• MPEG Program Stream
• Packetized Elementary Stream

Programming code, libraries, and tools

• ISO code to implement MPEG-1

Software

• Konvertor

Links

• Wikipedia article
• MPEG official website
• Official page on MPEG-1
• Forthcoming changes to MPEG-1 and MPEG-2 variants in next PRONOM/DROID signature release
• MPEG Headers Quick Reference (in DVD-Video Information)