Opus

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Not to be confused with the Opus-CBCS BBS software.
File Format
Name Opus
Ontology

Opus is a lossy audio compression format designed by the Internet Engineering Task Force (IETF) for applications requiring high-quality, low-delay audio transmission (e.g. telephony or network music performance). It incorporates technology from Skype's SILK codec and Xiph.org's CELT codec.

Opus-coded audio is usually found inside an Ogg container (where it carries the extension .opus) or in a WebM container.

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Information

Software

The Opus Codec downloads page contains opus-tools (encode / inspect / decode) .opus files and opusfile, an API for developers.

foobar2000 can play back and encode Opus files (with the Free Encoder Pack

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