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• 句法
• 规范
• 浏览器兼容性
• 相关话题

firCount 特性为 RTCRtpStreamStats dictionary indicates the number of Full Intra Request ( FIR ) packets have been sent by the receiver to the sender. This is a measure of how often the stream falls behind and has to skip frames in order to catch up.

句法

var firCount = RTCRtpStreamStats.firCount;
					

值

An integer value indicating how many FIR packets have been received by the sender during the current connection. This value is available only on receivers for video tracks.

The receiver sends a FIR packet to the sender any time it falls bahind or loses packets and cannot decode the incoming stream any longer because of the lost data. This tells the sender to send a full frame instead of a delta frame, so that the receiver can catch up.

The higher firCount is, the more often frames were dropped, which may be an indication that the media's bit rate is too high for the available bandwidth, or that the receiving device is overburdened and is therefore unable to process the incoming data.

规范

规范	状态	注释
Identifiers for WebRTC's Statistics API The definition of 'RTCInboundRtpStreamStats: firCount' in that specification.	候选推荐	初始定义。
Identifiers for WebRTC's Statistics API The definition of 'RTCOutboundRtpStreamStats: firCount' in that specification.	候选推荐	初始定义。

浏览器兼容性

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. 更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
firCount	Chrome No	Edge No	Firefox 55	IE No	Opera No	Safari ?	WebView Android No	Chrome Android No	Firefox Android 55	Opera Android No	Safari iOS ?	Samsung Internet Android No

图例

完整支持

完整支持

不支持

不支持

兼容性未知 ?

兼容性未知

元数据

• 最后修改： Jan 26, 2020

相关话题

1. WebRTC API
2. RTCRtpStreamStats
3. 特性

   1. codecId
   2. firCount
   3. kind
   4. nackCount
   5. pliCount
   6. qpSum
   7. sliCount
   8. ssrc
   9. trackId
   10. transportId
4. Related pages for WebRTC

   1. MediaDevices.getUserMedia()
   2. Navigator.mediaDevices
   3. RTCCertificate
   4. RTCDTMFSender
   5. RTCDTMFToneChangeEvent
   6. RTCDataChannel
   7. RTCDataChannelEvent
   8. RTCDtlsTransport
   9. RTCErrorEvent
   10. RTCIceCandidate
   11. RTCIceTransport
   12. RTCPeerConnection
   13. RTCPeerConnectionIceErrorEvent
   14. RTCPeerConnectionIceEvent
   15. RTCRtpReceiver
   16. RTCRtpSender
   17. RTCRtpTransceiver
   18. RTCSctpTransport
   19. RTCSessionDescription
   20. RTCStatsEvent
   21. RTCStatsReport
   22. RTCTrackEvent