https://developer.mozilla.org/en-US/docs/Web/API/RTCInboundRtpStreamStats/qpSum
RTCInboundRtpStreamStats: qpSum property - Web APIs | MDN
The qpSum property of the RTCInboundRtpStreamStats dictionary indicates the sum of the Quantization Parameter (QP) values for every frame sent or received on...
web apispropertymdn