Opus is a totally open, royalty-free, highly versatile audio codec. Opus is unmatched for interactive speech and music transmission over the Internet, but is also intended for storage and streaming applications. 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.
Technology
Opus can handle a wide range of audio applications, including Voice over IP, videoconferencing, in-game chat, and even remote live music performances. It can scale from low bitrate narrowband speech to very high quality stereo music. Supported features are:
Bitrates from 6 kb/s to 510 kb/s
Sampling rates from 8 kHz (narrowband) to 48 kHz (fullband)
Frame sizes from 2.5 ms to 60 ms
Support for both constant bitrate (CBR) and variable bitrate (VBR)
Audio bandwidth from narrowband to fullband
Support for speech and music
Support for mono and stereo
Support for up to 255 channels (multistream frames)
Dynamically adjustable bitrate, audio bandwidth, and frame size
Good loss robustness and packet loss concealment (PLC)
Floating point and fixed-point implementation
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Recent Releases
1.5.213 Apr 2024 22:45
minor feature:
Opus 1.5.2 several build that were discovered since
The 1.5 release. It also a misalignment in the AVX2 code
That could cause crashes under Windows.. Source code: opus-1.5.2.tar.gz
SHA256: 65c1d2f78b9f2fb20082c38cbe47c951ad5839345876e46941612ee87f9a7ce1
1.5.105 Mar 2024 18:45
minor feature:
Opus 1.5 is the first release to make extended use of ML in the encoder and
decoder. You can read all the details in this release demo page.
In summary, major changes since 1.4 include: In addition to the improvements above, this release includes many minor.
Opus 1.5.1 the meson build that was broken in 1.5.. Source code: opus-1.5.1.tar.gz
SHA256: b84610959b8d417b611aa12a22565e0a3732097c6389d19098d844543e340f85
1.402 Feb 2024 14:15
minor feature:
This Opus 1.4 major release brings the following improvements and fixes:
Improved tuning of the Opus in-band FEC (LBRR). See the issue for details
Added a OPUS_SET_INBAND_FEC(2) option that turns on FEC, but does not force SILK mode (FEC will be disabled in CELT mode)
Improved tuning and various fixes to DTX
Added Meson support, improved CMake support In addition to the improvements above, this release includes many minor bug fixes.
Additionally, we have begun experiments on upcoming neural packet loss concealment and deep redundancy (DRED) features. Although not included in this release, you can see two IETF drafts describing the proposed extension and redundancy mechanisms. The code is also available on this development branch.
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