The nackCount property of the RTCInboundRtpStreamStats dictionary is a numeric value indicating the number of times the receiver sent a NACK packet to the sender.
A NACK (Negative ACKnowledgement, also called "Generic NACK") packet tells the sender that one or more of the RTP packets it sent were lost in transport.
An integer value indicating how many times the receiver sent a NACK packet to the sender after detecting that one or more packets were lost during transport.
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https://developer.mozilla.org/en-US/docs/Web/API/RTCInboundRtpStreamStats/nackCount