Opus Encoder & Decoder SDK

AVBlocks provides a cross-platform Opus encoder SDK and Opus decoder SDK for C++, .NET (C#, VB, F#) and Python on Windows, macOS and Linux.

Opus is the modern, open audio codec built for the internet — excellent for both speech and music at low bitrates, with very low latency. It is the standard codec for WebRTC, voice chat and many streaming platforms.

Opus encoding

• Encode raw PCM to Opus.

• Optimize for speech or music; control bitrate, complexity and frame size.

• Mux into WebM / Matroska or pair Opus audio with VP9 / VP8 video.

Opus decoding

• Decode Opus to raw PCM.

• Read from WebM / Matroska and other containers.

• Feed decoded audio into your own processing or playback pipeline.

Typical uses

• VoIP and voice chat — low-latency, high-quality speech.

• WebRTC media pipelines — record, store and convert Opus.

• HTML5 audio — produce Opus in WebM for browsers.

• Transcode MP3 or AAC libraries to Opus to save bandwidth.

Get started

• Download the SDK

• Documentation

• Licensing

Part of the Audio SDK and Voice SDK. See also the AAC SDK and WebM / VP9 SDK.