RTCOutboundRtpStreamStats: nackCount property
  The nackCount property of the
  RTCOutboundRtpStreamStats dictionary is a numeric value indicating the
  number of times the RTCRtpSender described by this object received a
  NACK packet from the remote receiver.
  A NACK (Negative
  ACKnowledgement, also called "Generic NACK") packet is used by the
  RTCRtpReceiver to inform the sender that one or more RTP
  packets it sent were lost in transport.
Value
An integer value indicating how many times the sender received a NACK packet from the receiver, indicating the loss of one or more packets.
Specifications
No specification found
No specification data found for api.RTCOutboundRtpStreamStats.nackCount.
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