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.
An integer value indicating how many times the sender received a NACK packet from the receiver, indicating the loss of one or more packets.
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