# Opus Codec Opus is a totally open, royalty-free, highly versatile audio 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 Opus has the low algorithmic delay (26.5 ms by default) necessary for use as part of a real-time communication link, networked music performances, and live lip sync; by trading-off quality or bitrate, the delay can be reduced down to 5 ms --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://gia-duong-duc-minh.gitbook.io/notes/computer/opus-codec.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.