opus: opus (Audio Codec) opus: opus: Opus is a totally open, royalty-free, highly versatile audio codec. opus: It is standardized by the Internet Engineering Task Force (IETF) opus: as RFC 6716 which incorporated technology from Skype's SILK codec opus: and Xiph.Org's CELT codec. opus: opus: Project site: https://opus-codec.org/ opus: opus: opus: