Opus (codec)

Opus

Internet media type	audio/opus[1]
Developed by	Jean-Marc Valin, Koen Vos
Type of format	Audio
Contained by	Ogg
Extended from	SILK, CELT
Standard(s)	No, Internet Draft
Open format?	Yes
Website	opus-codec.org

Opus (originally Harmony^[2], also referred to internally as ietfcodec) is a low-delay wideband codec intended for applications such as VoIP that will eventually be royalty-free.^[3] Opus incorporates technology from the speech-oriented SILK codec and the low-latency CELT codec. Development for the codec is coordinated by the IETF.

Opus has been shown to have excellent quality,^[4] and at higher bit rates, it turns out to be competitive with codecs with much higher delay, such as HE-AAC and Vorbis.^[5]

External links

• Official website

References

1. ^ Network Working Group (July 4, 2011). "RTP Payload Format and File Storage Format for Opus Speech and Audio Codec". Opus codec. IETF. http://datatracker.ietf.org/doc/draft-spittka-payload-rtp-opus/. Retrieved October 26, 2011. 
2. ^ Vos, Koen (2010-10-15). "Harmony became Opus". ietfcodec Discussion Archive mailing list. http://www.ietf.org/mail-archive/web/codec/current/msg01852.html. Retrieved 2011-06-19. 
3. ^ Vos, Koen (July 23, 2011). "Skype Limited's Statement about IPR related to draft-ietf-codec-opus-07". IETF. http://datatracker.ietf.org/ipr/1602/. Retrieved October 26, 2011. 
4. ^ Raymond Chen et al. Opus Testing. IETF 80
5. ^ Maxwell, Greg (2011). "64kbit/sec stereo multiformat listening test - unofficial results page". Xiph.org Foundation. http://people.xiph.org/~greg/opus/ha2011/. Retrieved 2011-06-19. 

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