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Musepack

An open-source lossy audio codec, specifically optimized for transparent compression of stereo audio at bitrates of 160–180 (manual set allows bitrates up to 320) kbit/s.

Musepack or MPC is an open-source lossy audio codec, specifically optimized for transparent compression of stereo audio at bitrates of 160–180 (manual set allows bitrates up to 320) kbit/s. It was formerly known as MPEGplus, MPEG+, or MP+.

Development of MPC was initiated in 1997 by Andree Buschmann and later assumed by Frank Klemm, and as of 2004 is maintained by the Musepack Development Team (MDT) with assistance from Buschmann and Klemm. Encoders and decoders are available for Microsoft Windows, Linux and Mac OS X, and plugins for several third-party media players available from the Musepack website, licensed under the GNU Lesser General Public License (LGPL) or BSD licenses, and an extensive list of programs supporting the format.

Musepack was developed using the MP2 codec as a starting point, but many features have since been added, including:

  • subband selectable M/S encoding (as in AAC)
  • Huffman coding (as in MP3 and AAC, but more efficient). Since SV8 the bitstream is compressed by highly optimized canonical Huffman tables that yield 2% smaller files and faster decoding
  • noise substitution techniques (as in ATSC A-52 and MPEG-4 AAC V2)
  • pure variable bitrate between 0 and 1300 kbit/s (when needed)

The psychoacoustic model of MPC is based on MPEG ISO model 2, but is extended by CVD (clear voice detection). The quantization algorithm of the MPC encoder performs spectral shaping of the noise, called adaptive noise shaping (ANS), in order to overcome the low-frequency resolution of the polyphase quadrature filter bands.

MPC uses the APEv2 tag metadata container.

Musepack is mainly optimized for transparent encoding at the "--standard" preset (175-185 kbit/s). Very few optimizations have been made at lower bitrates (like 128 kbit/s). Nevertheless, various listening tests have been conducted in which Musepack has performed well at both lower and higher bitrates.

Features

  • Container-independent format. An SV8 MPC is a container file for a Musepack stream. Raw stream encoding is possible.
  • Packetized stream allows muxing into audio and video containers (e.g. MKA/MKV, NUT).
  • Sample-accurate, fast seeking independent of file length.
  • Sample-accurate cutting. Application included in download package (mpccut) allows losslessly cutting stream segments based on selected start/end samples.
  • Chapters. Chapter editor (mpcchap) included, for embedding chapters into MPC files.
  • No internal clipping.
  • Streamable.

Key Terms

aac
bitrates
definition
kbit
manual set allows
mpc
musepack
open source lossy audio codec
transparent compression stereo audio
usage

Additional Resources

No ressources found.

Acronymn

MPC

Synonymns

Musepack
(none found)

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Sources & Credits

Last modified on April 30 2020
Content adapted from Wikipedia
No credits found.
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