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.
Syntax
var nackCount = RTCRtpStreamStats.nackCount;
Value
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.
Specifications
| Specification | Status | Comment |
| Identifiers for WebRTC's Statistics APIThe definition of 'RTCInboundRtpStreamStats: nackCount' in that specification. | Candidate Recommendation | Initial definition. |
| Identifiers for WebRTC's Statistics APIThe definition of 'RTCOutboundRtpStreamStats: nackCount' in that specification. | Candidate Recommendation | Initial definition. |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Update compatibility data on GitHub
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
nackCount
|
Chrome
No support No |
Edge
No support No |
Firefox
Full support 55 |
IE
No support No |
Opera
No support No |
Safari
? |
WebView Android
No support No |
Chrome Android
No support No |
Firefox Android
Full support 55 |
Opera Android
No support No |
Safari iOS
? |
Samsung Internet Android
No support No |
Legend
- Full support
- Full support
- No support
- No support
- Compatibility unknown
- Compatibility unknown
RTCRtpStreamStats.nackCount by Mozilla Contributors is licensed under CC-BY-SA 2.5.
