Opus Codec

libopus 1.6.1

Wed, 14 Jan 2026 00:00:00 -0600

Opus 1.6.1 fixes several minor issues that were discovered since the 1.6 release.

Source code: opus-1.6.1.tar.gz
SHA256: 6ffcb593207be92584df15b32466ed64bbec99109f007c82205f0194572411a1

libopusenc 0.3

Sat, 03 Jan 2026 00:00:00 -0600

This release fixes a number of issues:

Fix ope_encoder_drain() assertion failures
Fix use of uninitialized fields
Fix undefined behaviour in picture.c
Fix crash with WIN32_LEAN_AND_MEAN on 64-bit Windows
Fix various warnings under C23
Drop use of private __opus_check_* macros
Port update_version from bash to sh
Clean up documentation files

Source code: libopusenc-0.3.tar.gz
SHA256: f616d3aff9b2034547894ccb8ab56c36cf1a4acb0d922c5d7119f97bbe58642c

libopus 1.6

Mon, 15 Dec 2025 00:00:00 -0600

Opus 1.6 builds on the new ML-based features introduced in Opus 1.5. You can read all the details in this release demo page. In summary, major changes since version 1.5 include:

A new wideband-to-fullband bandwidth extension (BWE) module
Support for 96 kHz audio with Opus HD
Significant improvement to Deep Redundancy (DRED)
A new 24-bit encoder/decoder API
Fixed-point improvements

In addition to the improvements above, this release includes many minor bug fixes.

Source code: opus-1.6.tar.gz
SHA256: b7637334527201fdfd6dd6a02e67aceffb0e5e60155bbd89175647a80301c92c

libopus 1.5.2

Fri, 12 Apr 2024 00:00:00 -0500

Opus 1.5.2 fixes several build issues that were discovered since the 1.5 release. It also fixes a misalignment issue in the AVX2 code that could cause crashes under Windows.

Source code: opus-1.5.2.tar.gz
SHA256: 65c1d2f78b9f2fb20082c38cbe47c951ad5839345876e46941612ee87f9a7ce1

libopus 1.5.1

Mon, 04 Mar 2024 00:00:00 -0600

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:

Significant improvement to packet loss robustness using Deep Redundancy (DRED)
Improved packet loss concealment through Deep PLC
Low-bitrate speech quality enhancement down to 6 kb/s wideband
Improved x86 (AVX2) and Arm (Neon) optimizations
Support for 4th and 5th order ambisonics

In addition to the improvements above, this release includes many minor bug fixes. Opus 1.5.1 fixes the meson build that was broken in 1.5.

Source code: opus-1.5.1.tar.gz
SHA256: b84610959b8d417b611aa12a22565e0a3732097c6389d19098d844543e340f85

libopus 1.5

Mon, 04 Mar 2024 00:00:00 -0600

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:

Significant improvement to packet loss robustness using Deep Redundancy (DRED)
Improved packet loss concealment through Deep PLC
Low-bitrate speech quality enhancement down to 6 kb/s wideband
Improved x86 (AVX2) and Arm (Neon) optimizations
Support for 4th and 5th order ambisonics

In addition to the improvements above, this release includes many minor bug fixes.

Source code: opus-1.5.tar.gz
SHA256: d8230bbeb99e6d558645aaad25d79de8f4f28fdcc55f8af230050586d62c4f2c

libopus 1.4

Thu, 20 Apr 2023 00:00:00 -0500

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.

Source code: opus-1.4.tar.gz

opusfile 0.12

Sat, 27 Jun 2020 00:00:00 -0500

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 v0.11 release:

Fix stack overflow buffering out-of-sequence streams.
Fix possible divide-by-zero.
Fix issues with seeking in the win32 backend.
Fix an issue where the seek algorithm could be confused by stream data changing between reads.
Clean up compiler and scan-build warnings.
Avoid use of the deprecated ftime() function which has Y2038 problems.
Remove undefined behaviour memcpy(NULL) in op_read_native().
Visual Studio project files updated for libogg 1.3.4 library name change.
Various build systems updates.
Various integration and testing environment improvements.

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

Note that because of the removal of certificate store hooks in openssl 1.1.1 and later, there are unfortunately no supported versions of that library which can be used with the code in opusurl to validate https responses against the system certificate store on Windows. Using the system default access to the certificate store on other platforms works fine.

Source code: opusfile-0.12.tar.gz, opusfile-0.12.zip.

SHA-256 checksums:

118d8601c12dd6a44f52423e68ca9083cc9f2bfe72da7a8c1acb22a80ae3550b  opusfile-0.12.tar.gz
7f44575596b78d7787c1865b9653e2a71546ff1ae77d87c53ab16dcc7af295ba  opusfile-0.12.zip

No Windows build is available for this release. Developers should integrate the source code directly into their applications.

Programming documentation is available in tree and online.

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

libopus 1.3.1

Fri, 12 Apr 2019 00:00:00 -0500

This Opus 1.3.1 minor release fixes an issue with the analysis on files with digital silence (all zeros), especially on x87 builds (mostly affects 32-bit builds). It also includes two new features:

A new OPUS_GET_IN_DTX query to know if the encoder is in DTX mode (last frame was either a comfort noise frame or not encoded at all)
A new (and still experimental) CMake-based build system that is eventually meant to replace the VS2015 build system (the autotools one will stay).

Source code: opus-1.3.1.tar.gz
Win32 binaries: opus-tools-0.2-opus-1.3.1.zip

libopus 1.3

Thu, 18 Oct 2018 00:00:00 -0500

This Opus 1.3 major release again brings quality improvements, new features, and bug fixes. You can read all the details in this release demo page. Changes since 1.2.x include:

Improvements to the VAD and speech/music classification using an RNN
Support for ambisonics coding using channel mapping families 2 and 3
Improvements to stereo speech coding at low bitrate
Using wideband encoding down to 9 kb/s
Making it possible to use SILK down to bitrates around 5 kb/s
Minor quality improvement on tones
Enabling the spec fixes in RFC 8251 by default
Security/hardening improvements

Notable bug fixes include:

Fixes to the CELT PLC
Bandwidth detection fixes

Source code: opus-1.3.tar.gz
Win32 binaries: opus-tools-0.2-opus-1.3.zip