Opus
Opus is a totally open, royalty-free, highly versatile audio codec. Opus is unmatched for interactive speech and music transmission over the Internet, but also intended for storage and streaming applications.
Features
- Low Latency
- Royalty free
Tags
- FOSS
- ietf
Opus News & Activities
Recent News
- POX published news article about Opus
Opus 1.5: Major update to open source audio codec introduces Machine Learning enhancementsOpus, the open-source audio codec known for its versatility, has released a major update with versi...
- Danilo_Venom published news article about Opus
Opus 1.4 Update: Improved Build System Support and FEC TuningOpus 1.4, the latest version of the open-source, royalty-free versatile audio codec, is now availab...
Recent activities
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Audio
What is Opus?
Opus is a totally open, royalty-free, highly versatile audio codec. Opus is unmatched for interactive speech and music transmission over the Internet, but 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 bit-rate narrowband speech to very high quality stereo music. Supported features are:
Bit-rates 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 bit-rate (CBR) and variable bit-rate (VBR) Audio bandwidth from narrowband to full-band 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.
Opus information
Developed by
IETF codec working groupLicensing
Open Source and Free product.Written in
Alternatives
5 alternatives listedSupported Languages
- English
AlternativeTo Category
Audio & MusicGitHub repository
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- 722 Forks
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Comments and Reviews
Opus is incredibly versatile and its introduction was a leap in audio encoding.
Its multi-mode/configuration capabilities allow it to equally-well support low and high bitrate/data scenarios, as well as low and high latency scenarios. Various encoding options give incredible versatility and customizability to the user to their needs.
The compression ratio is leaps better than previous and proprietary codecs.
When you do audio encoding your best choices are FLAC for lossless and Opus for lossy (but inaudably lossy by your choice).
Opus is amazing for everything, but APPLE, because they don't want to support it..
The best codec for podcasts or any other speech-heavy content.
Seems to be very promising. First tests were really good. Nice compression, and excellent quality. Looking forward to it.