May 26, 2018
IETF audio codec
Opus is a totally open, royalty-free, highly versatile audio codec. It is standardized by the Internet Engineering Task Force IETF as RFC 6716 which incorporated technology from Skype’s SILK codec and Xiph.Org’s CELT codec.
Opus is designed to handle a wide range of interactive audio applications, including Voice over IP, videoconferencing, in-game chat, and even live, distributed music performances. It scales from low bitrate narrowband speech at 6 kbit/s to very high quality stereo music at 510 kbit/s. Opus uses both Linear Prediction LP and the Modified Discrete Cosine Transform MDCT to achieve good compression of both speech and music.