RFC 6716: Definition of the Opus Audio Codec

Publisher

IETF / RFC Editor

URL

https://www.rfc-editor.org/rfc/rfc6716.html

Published

2012-09-01

Updated

unknown

Accessed

2026-09-24

HTTP status

200

License

IETF Trust Legal Provisions (BCP 78); IETF text may be excerpted with attribution; short excerpts and locators only

Source notes citing this source

• Opus defines five audio bandwidths: narrowband (8 kHz), medium-band (12 kHz), wideband (16 kHz), super-wideband (24 kHz) and fullband (48 kHz). The figures are effective sample rates. in context
• Opus supports bitrates from 6 kbit/s to 510 kbit/s. in context
• Opus encodes frames of 2.5, 5, 10, 20, 40 or 60 ms and can combine frames into packets of up to 120 ms. in context
• The primary normative part of RFC 6716 is the reference source code in Appendix A, and only its decoder portion is normative. in context
• Opus runs in three modes: SILK-only for low-bitrate speech, Hybrid (SILK plus CELT) for medium-bitrate speech, and CELT-only for music and low-delay use. in context

Cite this source record

APA

WarmTransfer. (2012, September 1). RFC 6716: Definition of the Opus Audio Codec. WarmTransfer. https://warmtransfer.net/knowledge/sources/rfc-6716-opus

BibTeX

@misc{warmtransfer-rfc-6716-opus,
  title  = {RFC 6716: Definition of the Opus Audio Codec},
  author = {{WarmTransfer}},
  year   = {2012},
  url    = {https://warmtransfer.net/knowledge/sources/rfc-6716-opus},
  note   = {IETF / RFC Editor, accessed 2026-09-24}
}