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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.

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Development binary builds

In addition to support in Firefox, Mozilla provides binary builds of Opus utilities.
Package Version Platform Download link Size
opus-tools 0.1.9 Windows opus-tools-0.1.9-win32.zip 403KiB
Mac OS X opus-tools-0.1.9-macos.tar.gz 399KiB
Source opus-tools-0.1.9.tar.gz 376KiB
Opus-tools provides command-line utilities to encode, inspect, and decode .opus files.
opusfile 0.7 Windows opusfile-0.7-win32.zip 1.6MiB
Source opusfile-0.7.tar.gz 452KiB
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

Latest stable release

libopus 1.1.2

Opus 1.1.2 includes:

  • Fixes encoder or decoder state reset, which would previously disable some run-time selected architecture-specific optimizations; and
  • Fixes hybrid mode discontinuous transmission (DTX) operation, where the comfort noise above 8 kHz was incorrectly estimated and could oscillate in time.
None of these bugs were regressions over previous releases.

Latest development releases

opusfile 0.7

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.

Changes since the v0.6 release:

  • Add API to access and preserve binary metadata.
  • Add support for R128_ALBUM_GAIN metadata tag.
  • Better seeking with continued packets and multiplexed streams.
  • Portability and build fixes.

This release is backward-compatible with the previous release but contains updates to conform with the latest IETF Ogg Opus draft, important performance enhancements, and bug fixes. We recommend all users upgrade.

opusfile 0.6

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.

Changes since the v0.5 release:

  • Fix bugs with comment handling
  • Fix build for BSD
  • Fix bugs handling invalid and non-opus streams

Some of these bugs kept basic functionality of the APIs from working at all, so we recommend all users upgrade.

Older/Historic Releases