Opus is a totally open, royalty-free, highly versatile audio codec. Opus is unmatched for interactive speech and music transmission over the Internet, but is also intended for storage and streaming applications. It is standardized by the Internet Engineering Task Force (IETF) as RFC 6716 which incorporated technology from Skype’s SILK codec and Xiph.Org’s CELT codec.
Opus can handle a wide range of audio applications, including Voice over IP, videoconferencing, in-game chat, and even remote live music performances. It can scale from low bitrate narrowband speech to very high quality stereo music. Supported features are:
You can read the full specification, including the reference implementation, in RFC 6716. An up-to-date implementation of the Opus standard is also available from the downloads page.
This Opus 1.2.1 minor release fixes a relatively rare issue where the 1.2 encoder would wrongly assume a signal to be bandlimited to 12 kHz and not encode frequencies between 12 and 20 kHz. This only happens on a few clips, but it is good to update to avoid a potential loss of quality.
There are no other changes compared to 1.2. Please report any problems.
Source code: opus-1.2.1.tar.gz
This Opus 1.2 major release brings many quality improvements, new features, and bug fixes. You can read all the details in this release demo page. Changes since 1.1.x include:
--enable-update-draft)There are no known regressions compared to the latest stable release (1.1.5). Please report any problems.
Source code: opus-1.2.tar.gz
Opus 1.2-rc1 is the first release candidate of the upcoming Opus 1.2 release. If no issues are found with it, it will soon become 1.2-final, so we encourage everyone to give it a try. Changes compared to 1.2-beta include:
Source code: opus-1.2-rc1.tar.gz
This is the first release of libopusenc, a library that provides an easy way to encode Ogg Opus files.
Source code: libopusenc-0.1.tar.gz