Opus is a lossy audio compression format developed by the Internet Engineering Task Force (IETF) designed to be suitable for interactive real-time applications over the Internet,a including music as well as speech, yet it is also very competitive for use as a storage and playback format, being a class leader at around 64 kbps and also at 96 kbps. As an open format standardised through Request for Comments (RFC) 6716,c a high quality reference implementation is provided under the 3-clause BSD licensea which compiles and runs on the vast majority of general purpose and embedded (fixed point) processors. Many Software patents which cover Opus are licensed under royalty-free terms.b Opus is also a Mandatory To Implement (MTI) codec for the upcoming WebRTC (Web Real Time Communication) specification of the World Wide Web Consortium (W3C).