RTCRtpSendParameters.encodings

The RTCRtpSendParameters dictionary's encodings property is an RTCRtpEncodingParameters object providing configuration settings for the encoder being used for the RTCRtpSender's track.

An array of objects conforming to the RTCRtpEncodingParameters dictionary, each of which contains properties which provide settings and parameters that describe and configure the codec used for a single destination.

In a connection in which there's only one remote peer, the encodings array will have just one object in it, describing the encoding to use when transmitting to that peer. For each peer you add the RTCRtpSender to, another entry is added to encodings to describe its configuration.