webrtc-internal
如何访问webrtc-internals
在有webrtc会话的时候，新打开一个tab，然后访问chrome://webrtc-internals/
词典
- BUNDLE: 在同一个socket连接上传多路流的技术
https://webrtcstandards.info/sdp-bundle/ - BWE: bandwidth estimate
- FIR: Full Intra Request
- NACK: Negative Acknowledgement
- PLI: Picture Loss Indication
- rtcp-mux: 在同一个socket连接上同时传输rtp和rtcp的技术
https://developer.mozilla.org/en-US/docs/Web/API/RTCConfiguration#RTCRtcpMuxPolicy_enum
示例媒体统计数据
Statistics RTCInboundRTPVideoStream_1417484896
kind video
firCount 0
pliCount 20
nackCount 26
[bytesReceived_in_bits/s] 86817.18910334124
packetsLost 66
framesReceived 3317
framesDecoded 3317
[framesDecoded/s] 14.985016070032664
keyFramesDecoded 56
framesDropped 0
lastPacketReceivedTimestamp 1.86209e+06
[codec] H264 (96, level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=640014)
frameWidth 320
frameHeight 240
framesPerSecond 15
参考文档
The Missing chrome://webrtc-internals Documentation
What do the Parameters in webrtc-internals Really Mean
这个文档讲了chrome可能因为cpu不足，或者带宽不足而降低帧率和编码分辨率，相关参数 googFrameRateInput, googCpuLimitedResolution ，googBandwidthLimitedResolution
这些个人在webrtc-internal中没有看到，有一些如果选legacy view能看到
How do you find the current active connection in webrtc-internals
这个文档讲连接，比如ICE，下面示例icecandidate事件中typ host代表这是一个local 地址，然后typ srflx对应STUN，typ relay对应TURN
sdpMid: video, sdpMLineIndex: 0, candidate: candidate:2747735740 1 udp 2122260223 192.168.75.1 60542 typ host generation 0 ufrag 307y network-id 2
ICE通过优先级控制使用哪个，TURN这种通过中继转发的被设为低优先级