When Was the Opus Audio Format Standardized?

This article provides a direct overview of the standardization timeline for the Opus audio codec by the Internet Engineering Task Force (IETF). It details the specific year the format was officially recognized, the Request for Comments (RFC) document associated with it, and the collaborative effort that led to its creation.

The Opus audio format was officially standardized by the IETF in 2012.

The standardization process concluded in September 2012 with the publication of RFC 6716. This milestone marked the official adoption of Opus as an open, royalty-free, and highly versatile audio coding format designed for interactive speech and music transmission over the internet.

The Path to Standardization

The development of Opus was a collaborative effort that merged two distinct audio technologies to create a single, superior codec:

• SILK: Developed by Skype, this codec was optimized for human speech and low-bitrate voice communication.
• CELT: Developed by the Xiph.Org Foundation, this codec was designed for high-fidelity music and ultra-low latency.

In 2010, the IETF formed the codec working group to merge these two technologies. The resulting codec, Opus, seamlessly transitions between SILK and CELT (or combines both) depending on the audio content and network bandwidth.

By achieving official IETF standardization in 2012, Opus became the primary recommended audio codec for WebRTC (Web Real-Time Communication) applications, solidifying its place as the industry standard for VoIP, game chat, and online streaming.