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• 句法
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

pliCount 特性为 RTCRtpStreamStats dictionary states the number of times the stream's receiving end sent a Picture Loss Indication ( PLI ) packet to the sender. A PLI packet indicates that some amount of encoded video data has been lost for one or more frames.

句法

var pliCount = RTCRtpStreamStats.pliCount;
					

值

An integer value indicating the number of times a PLI packet was sent by the stream's receiver to the sender.

A PLI message is used by video decoders (running on the receiving end of the stream) to notify the encoder (the sender) that an undefined amount of coded video data, which may span frame boundaries, has been lost.

This may trigger the sender to send a full frame in order to allow the receiver to re-synchronize, since lost data may be an irrecoverable situation for decoding media. However, the primary purpose of this message is to allow the sender to consider techniques to mitigate network performance issues. This is often achieved by methods such as increasing the compression, lowering resolution, or finding other ways to reduce the bit rate of the stream.

注意： This value is only available on the receiver, and only for video media.

规范

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

另请参阅

• RFC 4585: 6.3.1 : Definition of "PLI messages" in the document Extended RTP Profile for Real-time Transport Control Protocol (RTCP)-Based Feedback (RTP/AVPF) .

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