Opus Codec

libopus 1.3-beta

Thu, 21 Dec 2017 00:00:00 -0800

This Opus 1.3-beta beta release of the upcoming Opus 1.3 includes:

Enabling by default the spec fixes in RFC 8251
Improvements to the VAD and speech/music classification using an RNN
Improvements to stereo speech coding at low bitrate
Added support for ambisonics projection using mapping 3 (disabled by default)
Fixes to the CELT PLC

Additionally, as a way to test the upcoming update to opus-tools, we’re providing Windows binaries built with 1.3-beta. These binaries are based on libopusenc, which means opusenc is finally able to make use of the Opus delayed-decision feature to make better speech/music transitions.

Source code: opus-1.3-beta.tar.gz
Win32 binaries (experimental): opus-tools-test1.zip

libopusenc 0.1.1

Mon, 13 Nov 2017 00:00:00 -0800

This release fixes a few bugs in libopusenc 0.1, including the sample-accurate handling at the end of files. It also fixes crashes in a few use cases.

Source code: libopusenc-0.1.1.tar.gz

opusfile 0.9

Thu, 03 Aug 2017 00:00:00 -0700

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

opusfile depends on libopus and libogg. The included opusurl library for http(s) access depends on

opusfile and openssl.

Changes since the v0.8 release:

Fix an invalid free with tag handling.
Improve handling of corrupt streams.
Improve performance on streams with many chain segments.
Improve TLS host validation.
Align op_raw_total to work better with op_raw_seek.
Documentation and build improvements.

This release is backward-compatible with the previous release. We recommend all users upgrade.

The library is functional, but there are likely issues we didn’t find in our own testing. Please give feedback in #opus on irc.freenode.net or at opus@xiph.org.

Programming documentation is available in tree and online.

Source code: opusfile-0.9.tar.gz, opusfile-0.9.zip Windows build: opusfile-v0.9-win32.zip

libopus 1.2.1

Mon, 26 Jun 2017 00:00:00 -0700

This Opus 1.2.1 minor release fixes a relatively rare issue where the 1.2 encoder would wrongly assume a signal to be bandlimited to 12 kHz and not encode frequencies between 12 and 20 kHz. This only happens on a few clips, but it is good to update to avoid a potential loss of quality.

There are no other changes compared to 1.2. Please report any problems.

Source code: opus-1.2.1.tar.gz

libopus 1.2

Tue, 20 Jun 2017 00:00:00 -0700

This Opus 1.2 major release brings many quality improvements, new features, and bug fixes. You can read all the details in this release demo page. Changes since 1.1.x include:

Speech quality improvements especially in the 12-20 kbit/s range
Improved VBR encoding for hybrid mode
More aggressive use of wider speech bandwidth, including fullband speech starting at 14 kbit/s
Music quality improvements in the 32-48 kb/s range
Generic and SSE CELT optimizations
Support for directly encoding packets up to 120 ms
DTX support for CELT mode
SILK CBR improvements
Support for all of the fixes in draft-ietf-codec-opus-update-06 (the mono downmix and the folding fixes need --enable-update-draft)
Many bug fixes, including integer wrap-arounds discovered through fuzzing (no security implications)

There are no known regressions compared to the latest stable release (1.1.5). Please report any problems.

Source code: opus-1.2.tar.gz

libopus 1.2-rc1

Thu, 08 Jun 2017 00:00:00 -0700

Opus 1.2-rc1 is the first release candidate of the upcoming Opus 1.2 release. If no issues are found with it, it will soon become 1.2-final, so we encourage everyone to give it a try. Changes compared to 1.2-beta include:

Improves quality on files with powerful tones that cause MDCT leakage
Improves bit allocation on mode transitions (CELT to/from SILK/hybrid)
More ARM Neon optimizations
Fixes to the speech/music detection at the very beginning of files
Fixes to the unit tests (fixes illegal instructions and –disable-static)

Source code: opus-1.2-rc1.tar.gz

libopusenc 0.1

Wed, 24 May 2017 00:00:00 -0700

This is the first release of libopusenc, a library that provides an easy way to encode Ogg Opus files.

Source code: libopusenc-0.1.tar.gz

libopus 1.2-beta

Wed, 24 May 2017 00:00:00 -0700

This Opus 1.2-beta beta release of the upcoming Opus 1.2 fixes a bug in surround encoding causing very bad quality on signals beyond a certain amplitude. Thanks to Franziska Trojahn and others from HfT Leipzig for finding this issue through their listening test (the quality of the two bad files in the paper should now be similar to the others). Also included in this release are some more ARM Neon optimizations and some low-bitrate quality tuning.

Source code: opus-1.2-beta.tar.gz

libopus 1.1.5

Wed, 24 May 2017 00:00:00 -0700

This Opus 1.1.5 release backports the surround encoder bug fix from 1.2-beta. There are no other changes compared to 1.1.4.

Source code: opus-1.1.5.tar.gz

libopus 1.1.4

Fri, 20 Jan 2017 00:00:00 -0800

This Opus 1.1.4 release fixes a single bug. A specially-crafted Opus packet could cause an integer wrap-around in the SILK LSF stabilization code. This would cause an out-of-bounds read 256 bytes before a constant table. In most circumstances, the consequences are harmless and the result is simply noise in the audio.

This was reported as CVE-2017-0381. Contrary to that report, our own analysis shows that no remote code execution is possible. However, we are making this release as a precaution.

Source code: opus-1.1.4.tar.gz