MPEG-1 Audio Layer II

MPEG-1 or MPEG-2 Audio Layer II
Filename extension	.mp2
Internet media type	audio/mpeg, audio/MPA
Initial release	6 December 1991
Latest release	ISO/IEC 13818-3:1998; April 1998
Type of format	Lossy audio
Contained by	MPEG-ES
Standard	ISO/IEC 11172-3, ISO/IEC 13818-3
Open format?	Yes
Free format?	Yes
Website	http://mpeg.chiariglione.org/standards/mpeg-1/audio.html

MPEG-1 Audio Layer II or MPEG-2 Audio Layer II (MP2, sometimes incorrectly called Musicam or MUSICAM)^[7] is a lossy audio compression format defined by ISO/IEC 11172-3 alongside MPEG-1 Audio Layer I and MPEG-1 Audio Layer III (MP3). While MP3 is much more popular for PC and Internet applications, MP2 remains a dominant standard for audio broadcasting.^[8]

^ M. Nilsson (November 2000). The audio/mpeg Media Type. Network Working Group. doi:10.17487/RFC3003. RFC 3003. Proposed Standard.
^ S. Casner; P. Hoschka (July 2003). MIME Type Registration of RTP Payload Formats. Network Working Group. doi:10.17487/RFC3555. RFC 3555. Proposed Standard. Obsoleted by RFC 4855, 4856. Updated by RFC 3625, 4629.
^ Patel K, Smith BC, Rowe LA (1993-09-01). "Performance of a software MPEG video decoder". Proceedings of the first ACM international conference on Multimedia - MULTIMEDIA '93. ACM Multimedia. New York City: Association for Computing Machinery. pp. 75–82. doi:10.1145/166266.166274. ISBN 978-0-89791-596-0. S2CID 3773268. Reference 3 in the paper is to Committee Draft of Standard ISO/IEC 11172, December 6, 1991.
^ "ISO/IEC 11172-3:1993 – Information technology — Coding of moving pictures and associated audio for digital storage media at up to about 1,5 Mbit/s — Part 3: Audio". ISO. 1993. Retrieved 2010-07-14.
^ "ISO/IEC 13818-3:1995 – Information technology — Generic coding of moving pictures and associated audio information — Part 3: Audio". ISO. 1995. Retrieved 2010-07-14.
^ MPEG-1 and MPEG-2 Layer II Audio Encoding (Partial draft). Sustainability of Digital Formats. Washington, D.C.: Library of Congress. 17 May 2012. Retrieved 1 December 2021.
^ "MPEG Audio FAQ Version 9". 1998. Retrieved 2010-08-22.
^ Techopedia (16 February 2015). "MPEG-1 Audio Layer II (MP2)". techopedia.com. Retrieved 2022-03-17.

[rfc3003-1] M. Nilsson (November 2000). The audio/mpeg Media Type. Network Working Group. doi:10.17487/RFC3003. RFC 3003. Proposed Standard.

[rfc3555-2] S. Casner; P. Hoschka (July 2003). MIME Type Registration of RTP Payload Formats. Network Working Group. doi:10.17487/RFC3555. RFC 3555. Proposed Standard. Obsoleted by RFC 4855, 4856. Updated by RFC 3625, 4629.

[11172-draft-cite-3] Patel K, Smith BC, Rowe LA (1993-09-01). "Performance of a software MPEG video decoder". Proceedings of the first ACM international conference on Multimedia - MULTIMEDIA '93. ACM Multimedia. New York City: Association for Computing Machinery. pp. 75–82. doi:10.1145/166266.166274. ISBN 978-0-89791-596-0. S2CID 3773268. Reference 3 in the paper is to Committee Draft of Standard ISO/IEC 11172, December 6, 1991.

[11172-3-4] "ISO/IEC 11172-3:1993 – Information technology — Coding of moving pictures and associated audio for digital storage media at up to about 1,5 Mbit/s — Part 3: Audio". ISO. 1993. Retrieved 2010-07-14.

[13818-3-5] "ISO/IEC 13818-3:1995 – Information technology — Generic coding of moving pictures and associated audio information — Part 3: Audio". ISO. 1995. Retrieved 2010-07-14.

[6] MPEG-1 and MPEG-2 Layer II Audio Encoding (Partial draft). Sustainability of Digital Formats. Washington, D.C.: Library of Congress. 17 May 2012. Retrieved 1 December 2021.

[mpegfaq-7] "MPEG Audio FAQ Version 9". 1998. Retrieved 2010-08-22.

[8] Techopedia (16 February 2015). "MPEG-1 Audio Layer II (MP2)". techopedia.com. Retrieved 2022-03-17.

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