Opus: Difference between revisions

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| caption = Opus Interactive Audio Codec
| caption = Opus Interactive Audio Codec
| maintainer = [http://xiph.org/ Xiph.Org Foundation]
| maintainer = [http://xiph.org/ Xiph.Org Foundation]
| stable_release = 1.0.1
| stable_release = 1.0.2
| preview_release = exp_analysis7
| preview_release = exp_analysis7
| operating_system = Windows, Mac OS/X, Linux/BSD
| operating_system = Windows, Mac OS/X, Linux/BSD

Revision as of 17:30, 14 December 2012

Opus
Official Opus logo

Opus Interactive Audio Codec
Developer(s) Xiph.Org Foundation
Release information
Initial release {{{released}}}
Stable release 1.0.2
Preview release exp_analysis7
Compatibility
Operating system Windows, Mac OS/X, Linux/BSD
Additional information
Use Encoder/Decoder
License 3-clause BSD license
Website opus-codec.org

Opus is a lossy audio compression format developed by the Internet Engineering Task Force (IETF) and made especially suitable for interactive real-time applications over the Internet[1]. As an open format standardised through Request for Comments (RFC) 6716, a reference implementation is provided under the 3-clause BSD license[1]. Many Software patents which cover Opus are licensed under royalty-free terms[2].

Opus incorporates technology from two codecs, the speech-oriented SILK codec and the low-latency CELT codec[3]. Opus can scale to high and low bitrates and can transition between a linear prediction codec at lower bitrates and a transform codec at higher bitrates, as well as a hybrid for a short overlap[3]. Opus has very low algorithmic delay compared to popular music formats such as MP3, Vorbis, and HE-AAC, and yet performs very competitively with them in terms of quality per bitrate. Also unlike these codecs, Opus does not require the definition of large codebooks for each individual file, making it also preferable for short clips of audio[3].

Caracteristics

Notes and references

  1. Opus Codec. Opus (Home page). Xiph.org Foundation. Retrieved September 21, 2012. [1]
  2. Opus FAQ. Opus (FAQ). Xiph.org Foundation. Retrieved September 21, 2012. [2]
  3. RFC6716. Mozilla Corporation, Skype Technologies S. A. Retrieved September 21, 2012.[3]