Opus is a totally open, royalty-free audio codec that can be used for all audio applications, from music streaming and storage to high-quality video-conferencing and VoIP. Six years after its standardization by the IETF, Opus is now included in all major browsers and mobile operating systems. It has been adopted for a wide range of applications, and is the default WebRTC codec.
This release brings quality improvements to both speech and music compression, while remaining fully compatible with RFC 6716. Here’s a few of the upgrades that users and implementers will care about the most.
Opus 1.3 includes a brand new speech/music detector. It is based on a recurrent neural network and is both simpler and more reliable than the detector that has been used since version 1.1. The new detector should improve the Opus performance on mixed content encoding, especially at bitrates below 48 kb/s.
There are also many improvements for speech encoding at lower bitrates, both for mono and stereo. The demo contains many more details, as well as some audio samples. This new release also includes a cool new feature: ambisonics support. Ambisonics can be used to encode 3D audio soundtracks for VR and 360 videos.
You can read all the details of The Release of Opus 1.3.