Link
https://w3c.github.io/media-capabilities/#dictdef-audioconfigurationProperties
bitrate
bitrate:number
The bitrate member represents the number of average bitrate of the audio track.
The bitrate is the number of bits used to encode a second of the audio track.
Link
https://w3c.github.io/media-capabilities/#dom-audioconfiguration-bitratechannels
channels:string
The channels member represents the audio channels used by the audio track.
channels is only applicable to the decoding types media-source, file, and webrtc
and the encoding type webrtc.
