# Opus codec registration ## Description The Opus audio codec, specified in [RFC 6716](https://www.rfc-editor.org/rfc/rfc6716). ## Codec ID ```ts 'opus' ``` ## `EncodedPacket` data The packet's data must be an Opus packet as described in Section 3 of [RFC 6716](https://www.rfc-editor.org/rfc/rfc6716). ## `EncodedPacket` type The packet's type is always `'key'`. ## `AudioDecoderConfig` codec string ```ts 'opus' ``` ## `AudioDecoderConfig` description If present, `description` must be an Identification Header as defined in Section 5.1 of [RFC 7845](https://www.rfc-editor.org/rfc/rfc7845).