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Opus

A royalty free audio codec developed by the Xiph.Org Foundation. It supercedes their prior Speex and Vorbis codecs, previously recommended separately for human speech and for general audio, with a single unified codec. Opus tends to exhibit both high audio quality and low enough algorithmic latency to be usable in real time communication applications.

In video, this codec is most commonly used with the VP9 or AV1 codecs.

When used on its own, an Opus audio file usually has the .opus extension.

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