The first version of CELT became available in 2009, and shortly thereafter Skype joined the IETF and asked to create a working group to develop a standardized “Internet Wideband Audio Codec”. Opus originally comes from two independent efforts: The SILK codec that Skype started developing in 2007, and the CELT codec from which was also under development in 2007. Beyond the new standard, Opus is interesting because of its technical claims, capability to provide high-quality real time audio encoding and decoding for a wide range of bit rates and sampling rates, and the fact that Opus is not only free, it's open sourced. Opus has seen a lot of press lately due to its receiving a newly IETF approved standard in RFC 6716. Opus is a relatively new audio codec that was created through a joint effort between several organizations based on two previously available codecs: SILK from Skype, and CELT from.
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