Opus downloads

Even though Opus is now standardized by the IETF, this Opus implementation will keep improving in the future. Of course, all future versions will still be fully compliant with the Opus IETF specification.
See the development page for the latest development information.

Development binary builds

In addition to support in Firefox, Mozilla provides binary builds of Opus utilities.

• opus-tools 0.1.9
  • Source
  • Windows
  • OS X
• opusfile 0.7
  • Source
  • Windows

Opus-tools provides command-line utilities to encode, inspect, and decode .opus files.
Opusfile provides application developers with a high-level API for decoding and seeking in .opus files. DLLs for the required libraries libogg 1.3.2, libopus 1.1.1 and openssl, are also included in the binary package.

Source code (stable release)

• libopus 1.1.3

  Jul 15, 2016

  This Opus 1.1.3 release focuses mainly on optimizations and bug fixes. Changes include:

  • Neon optimizations improving performance on ARMv7 and ARMv8 by up to 15%
  • Fixes some issues with 16-bit platforms (e.g. TI C55x)
  • Fixes to comfort noise generation (CNG)
  • Documenting that PLC packets can also be 2 bytes
  • Includes experimental ambisonics work (–enable-ambisonics)

  None of the bugs that were fixed were regressions over previous releases.

  Source code: opus-1.1.3.tar.gz

Source code (development releases)

• libopus 1.2-alpha

  Nov 3, 2016

  This Opus 1.2-alpha alpha release of the upcoming Opus 1.2 brings many quality improvements, new features, and bug fixes, including:

  • 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-04 (the mono downmix and the folding fixes need –enable-update-draft)
  • Many bug fixes, including integer overflows discovered through fuzzing (no security implications)

  Please test it and and report any problems. There are no known regressions compared to the latest stable release (1.1.3), but given the large number of changes, it’s possible some bugs have slipped through.

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

  ---

• libopus 1.1.1 RC

  Oct 28, 2015

  This is a release candidate for the upcoming 1.1.1 version. This release includes further ARM optimizations.

  Source code: opus-1.1.1-rc.tar.gz

  ---

See the news archive for all releases