Older/Historic Releases

libopus 1.1-beta

This is a beta release for the upcoming 1.1 version. The improvements are listed in Monty's Opus 1.1-beta demo.

libopus 1.1-alpha

This is an alpha release for the upcoming 1.1 version. Compared to 1.0.2, it includes quality improvements, optimizations, bug fixes, as well as an experimental speech/music detector for mode decisions. All the fixes and improvements from 1.0.2 are also in this release. Quality improvements include unconstrained VBR, a bitrate boost for tonal frames, and improvements to tf estimation, transient detection and dynamic allocation.

opus-tools 0.1.6

This release includes many build fixes, especially for Windows, as well as some minor correctness improvements. The opusenc --uncoupled switch is no longer advertised because this debugging option was being mistaken for a quality enhancement.

An experiemental opusrtp tool is new in this release. It is not installed by default because it's of limited usefulness, mostly for debugging other RTP implementations. It can send an Opus file over RTP or record a packet stream to an Opus file, on POSIX systems.

opusfile 0.2

The opusfile library provides seeking, decode, and playback of Opus streams in the Ogg container (.opus files) including over http on posix systems.

This release accepts valid ssl certificates, and improves some build and packaging issues.

opus-tools 0.1.5

This release removes the confusing and ineffective '--speech' and '--music' options to opusenc, and improves build system support.

opusfile 0.1

This release provides a high-level decoding and seeking API for .opus files.

libopus 1.0.2

Opus 1.0.2 fixes an out-of-bounds read that could be triggered by a malicious Opus packet causing an integer wrap-around in the padding code. Considering that the packet would have to be at least 16 MB in size and that no out-of-bounds write is possible, the severity is very low. Other changes include fixes and improvements to the PLC and hybrid mode quality improvements. As usual, this release is fully compliant with the Opus specification.

libopus 1.0.1

This release includes minor updates (mostly related to the the build system) that did not make it to the final RFC. It is fully compliant with the Opus specification.

libopus 1.0.0

This release is identical to the final Opus reference implementation included in RFC6716.

libopus 1.0.1-RC3

This is a third release candidate for the upcoming 1.0.1 release. This release includes documentation fixes, portability improvements, and build file fixes, including a generic Makefile.unix.

libopus 1.0.1-RC2

This is a second release candidate for the upcoming 1.0.1 release. This release includes documentation fixes, and it should now be possible to build on Windows.

libopus 1.0.0-RC

This is a release candidate for the final 1.0 release. Other than the RFC number in the comments, this code is expected to be the same as the final RFC and 1.0 release.

libopus 1.0.1-RC

This is a release candidate for the upcoming 1.0.1 release. The release includes minor updates (mostly related to the build system) that did not make it to the upcoming RFC.

libopus 0.9.14

This version matches version -14 of the draft and fixes minor issues brought up before the upcoming IETF last call. There is no change to the bit-stream.

Libopus versions 0.9.11-0.9.13 were skipped to synchronize release and draft numbering.

opus-tools 0.1.4

This release fixes several resampling bugs and greatly increases resampler performance. It also provides working Unicode filename and tag support for Windows (Unicode worked for Mac and *nix previously).

opus-tools 0.1.3

This release adds proper multichannel WAV output from opusdec, disables the non-working '--stereo' and '--mono' mixdown switches, and uses linear predictive coding to generate padding on the final frame to reduce the risk of clicking with gapless playback.

opus-tools 0.1.2

Numerous small fixes including piped audio on Windows and clicking on resampled audio.

libopus 0.9.10

This version matches version -12 of the draft and fixes minor issues brought up before the upcoming IETF last call. There is no change to the bit-stream.

libopus 0.9.9

This version matches version -11 of the draft. The bit-stream has not changed, except for some corner cases that are unlikely to happen in the real world.

libopus 0.9.8

This version matches version -10 of the draft and fixes several glitches caused by mode switching and other corner cases. This required breaking the bit-stream for the SILK-only stereo and hybrid stereo modes. Fortunately, these modes are not often used, so few users should be affected. This release also implements a CBR mode for SILK mode. This release includes a much better test suite and has been extensively tested in multiple configurations. See the Jenkins build system and the resulting floating-point coverage and fixed-point coverage. Now that the analysis and documentation of the code has been completed, further changes to the bit-stream until the final freeze are unlikely.

libopus 0.9.6

This is a cleanup release for version -08 of the draft. The bit-stream remains tentatively frozen.

libopus 0.9.5

This is a cleanup release for version -07 of the draft. The bit-stream is tentatively frozen. It will not change unless a major issue is found or if for some reason the Working Group decides something needs to be change.

libopus 0.9.2

Opus libopus 0.9.2 adds support for glitchless switching between the voice and audio mode. Also, the encoder now defaults to a new "automatic" mode and bandwidth selection and attempts to select the optimal mode and bandwidth considering the bit-rate and voice content. Several bugs were also fixed and the codec and test tools should be more robust in general.

libopus 0.9.1

Opus libopus 0.9.1 fixes a few minor bugs that were found in version libopus 0.9.0. Unfortunately, this has required slight changes to the bit-stream, which is thus not compatible with libopus 0.9.0. This release adds support for forward error correction (FEC), which improves performance under packet loss.

Older releases