Opus is a
lossy audio coding format developed by
Xiph and standardized by the
IETF, designed to efficiently code speech and general audio in a single format, while remaining
low-latency enough for real-time interactive communication and low-complexity enough for low end ARM3 processors. Opus replaces both
Vorbis and
Speex, and several blind listening tests have ranked it higher quality than any other standard audio format at any given bitrate, including
MP3,
AAC, and
HE-AAC.