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 0.1.10
  (Opus 1.2)
  • Source
  • Windows
  • OS X (older)
• opusfile 0.9
  • 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 1.2.1

  Jun 26, 2017

  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

Source code (development releases)

• libopus 1.3-rc

  Jun 1, 2018

  This Opus 1.3-rc release candidate of the upcoming Opus 1.3 includes:

  • Making it possible to use SILK down to bitrates around 5 kb/s
  • Using wideband encoding down to 9 kb/s
  • Improving security (including a new –enable-hardening option)
  • Minor quality improvement on tones
  • Improving Ambisonics support (still experimental)
  • Minor bug fixes

  Again, we’re providing experimental Windows binaries built with 1.3-rc and the upcoming opus-tools and libopusenc.

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

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• libopusenc 0.1.1

  Nov 13, 2017

  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

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• opusfile 0.9

  Aug 3, 2017

  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

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• opus-tools 0.1.9

  Jun 12, 2014

  This release adds support for 32-bit floating point WAV output and fixes a number of minor issues.

  Source code: opus-tools-0.1.9.tar.gz

See the news archive for all releases