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libopus, opus, interactive, audio, codec, overview, technology, news, libopusenc,

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opus codec home downloads documentation presentations development comparison examples opus faq license contact opus interactive audio codec overview opus is a totally open royalty free highly versatile audio codec opus is unmatched for interactive speech and music transmission over the internet but is also intended for storage and streaming applications it is standardized by the internet engineering task force ietf as rfc 6716 which incorporated technology from skype s silk codec and xiph org s celt codec technology opus can handle a wide range of audio applications including voice over ip videoconferencing in game chat and even remote live music performances it can scale from low bitrate narrowband speech to very high quality stereo music supported features are bitrates from 6 kb s to 510 kb s sampling rates from 8 khz narrowband to 48 khz fullband frame sizes from 2 5 ms to 60 ms support for both constant bitrate cbr and variable bitrate vbr audio bandwidth from narrowband to fullband support for speech and music support for mono and stereo support for up to 255 channels multistream frames dynamically adjustable bitrate audio bandwidth and frame size good loss robustness and packet loss concealment plc floating point and fixed point implementation you can read the full specification including the reference implementation in rfc 6716 an up to date implementation of the opus standard is also available from the downloads page news libopus 1 6 1 jan 14 2026 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 jan 3 2026 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 dec 15 2025 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 apr 12 2024 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 see all news or subscribe via rss copyright 2011 2024 this website is licensed under a creative commons attribution 3 0 unported license