RTCOutboundRtpStreamStats: nackCount property

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since January 2020.

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

Specification
Identifiers for WebRTC's Statistics API
# dom-rtcoutboundrtpstreamstats-nackcount

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
nackCount in 'outbound-rtp' stats

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Full support
Full support