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Opus Audio Codec Approved As New IETF Standard

Mozilla

Published on 12 September 2012 09:45 PM EDT
Written by Michael Larabel in Mozilla
7 Comments

The Internet Engineering Task Force (IETF) has approved of Opus as a new audio codec standard via RFC 6716.

Opus audio has been talked about before on Phoronix as an interesting open-source audio codec that effectively pairs Skype's SILC codec with the CELT codec from Xiph.Org. Mozilla, Skype, Google, Broadcom, and other organizations have been involved with the Opus development. Opus has many potential use-cases from VoIP software to online gaming and music streaming.

The news now is that the Internet Engineering Task Force has approved of Opus for becoming the next audio standard via RFC 6716. "This document defines the Opus interactive speech and audio codec. Opus is designed to handle a wide range of interactive audio applications, including Voice over IP, videoconferencing, in-game chat, and even live, distributed music performances. It scales from low bitrate narrowband speech at 6 kbit/s to very high quality stereo music at 510 kbit/s. Opus uses both Linear Prediction (LP) and the Modified Discrete Cosine Transform (MDCT) to achieve good compression of both speech and music."

Opus supports bit-rates from 6kb/s to 512kb/s, voice and music, mono and stereo, narrowband (8 kHZ) to full-band (48 kHz), and frame-sizes from 2.5ms to 60ms. The Opus audio codec is very versatile.

More information on the approval of Opus by IETF can be found from this Mozilla Hacks blog post.

About The Author
Michael Larabel is the principal author of Phoronix.com and founded the web-site in 2004 with a focus on enriching the Linux hardware experience and being the largest web-site devoted to Linux hardware reviews, particularly for products relevant to Linux gamers and enthusiasts but also commonly reviewing servers/workstations and embedded Linux devices. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics hardware drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated testing software. He can be followed via and or contacted via .
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