The nackCount property of the RTCRtpStreamStats 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.
var nackCount = RTCRtpStreamStats.nackCount;
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.
Note: This value is only available on the receiver.
| Specification | Status | Comment |
|---|---|---|
| Identifiers for WebRTC's Statistics API The definition of 'RTCRtpStreamStats.nackCount' in that specification. | Candidate Recommendation | Initial definition. |
| Desktop | ||||||
|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | |
| Basic support | No | ? | 55 | No | No | ? |
| Mobile | |||||||
|---|---|---|---|---|---|---|---|
| Android webview | Chrome for Android | Edge Mobile | Firefox for Android | Opera for Android | iOS Safari | Samsung Internet | |
| Basic support | No | No | ? | 55 | No | ? | ? |
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https://developer.mozilla.org/en-US/docs/Web/API/RTCRtpStreamStats/nackCount