Chrome 理解webrtc转储

e5nszbig  于 2022-12-06  发布在  Go
关注(0)|答案(3)|浏览(208)

我从chrome://webrtc-internals下载了转储文件
现在,我想从这些数据中获得意义,并绘制一些图表,以显示信息包丢失和转储中包含的其他内容
我只能在chrome://webrtc-internals中看到图表,但我想自己做这些事情,并在过程中更好地理解日志。
每个字段表示什么
到现在为止我只能理解这是一个垃圾场。
帮帮我好吗

l2osamch

l2osamch1#

The value arrays that you see under under each log item are the value that is gathered for that item for that second. So, for values[0] is the log information gathered for that category for the first second. So, match the ssrc with the one provided in the SDPs to get each ssrc's log information for each second.
Explained further:
This shows that there is no packet lost for ssrc 1814250626 and shows that there was zero packet loss for each second for the log period.

"ssrc_1814250626-packetsLost": {
     "startTime": "2014-05-11T21:26:06.360Z",
     "endTime": "2014-05-11T21:26:19.362Z",
     "values": "[0,0,0,0,0,0,0,0,0,0,0,0,0,0]"
    },

We can compare the ssrc value against the SDPs that are exchanged to get who and what media type each source represents.

"time": "5/11/2014 4:26:05 PM",
     "type": "createOfferOnSuccess",
     "value": "type: offer, sdp: v=0\r\no=- 140296487447716144 2 IN IP4 127.0.0.1\r\ns=-\r\nt=0 0\r\na=group:BUNDLE audio video\r\na=msid-semantic: WMS yGvpzuQVRTY2AmSWclrFlBZctrOijzNQkLnN\r\nm=audio 1 RTP/SAVPF 111 103 104 0 8 126\r\nc=IN IP4 0.0.0.0\r\na=rtcp:1 IN IP4 0.0.0.0\r\na=ice-ufrag:Xv9/Bx9tAWEOh1pE\r\na=ice-pwd:e7rRuOyKLk1bKUcZ1S+tDw7r\r\na=ice-options:google-ice\r\na=fingerprint:sha-256 B4:1F:B0:32:31:60:0F:E1:EC:6D:0E:65:1D:F8:F6:F1:0C:FE:D9:46:41:37:8A:7A:21:AC:39:7A:12:0E:12:99\r\na=setup:actpass\r\na=mid:audio\r\na=extmap:1 urn:ietf:params:rtp-hdrext:ssrc-audio-level\r\na=sendrecv\r\na=rtcp-mux\r\na=crypto:1 AES_CM_128_HMAC_SHA1_80 inline:gl34DLHmuMoKoaUWhYJpDJUFkZagn1cedT1x6nQh\r\na=rtpmap:111 opus/48000/2\r\na=fmtp:111 minptime=10\r\na=rtpmap:103 ISAC/16000\r\na=rtpmap:104 ISAC/32000\r\na=rtpmap:0 PCMU/8000\r\na=rtpmap:8 PCMA/8000\r\na=rtpmap:126 telephone-event/8000\r\na=maxptime:60\r\na=ssrc:1814250626 cname:aIdRfz6vBYDbJiEF\r\na=ssrc:1814250626 msid:yGvpzuQVRTY2AmSWclrFlBZctrOijzNQkLnN fad6fe24-b006-4a57-80d6-c603416f32b5\r\na=ssrc:1814250626 mslabel:yGvpzuQVRTY2AmSWclrFlBZctrOijzNQkLnN\r\na=ssrc:1814250626 label:fad6fe24-b006-4a57-80d6-c603416f32b5\r\nm=video 1 RTP/SAVPF 100 116 117\r\nc=IN IP4 0.0.0.0\r\na=rtcp:1 IN IP4 0.0.0.0\r\na=ice-ufrag:Xv9/Bx9tAWEOh1pE\r\na=ice-pwd:e7rRuOyKLk1bKUcZ1S+tDw7r\r\na=ice-options:google-ice\r\na=fingerprint:sha-256 B4:1F:B0:32:31:60:0F:E1:EC:6D:0E:65:1D:F8:F6:F1:0C:FE:D9:46:41:37:8A:7A:21:AC:39:7A:12:0E:12:99\r\na=setup:actpass\r\na=mid:video\r\na=extmap:2 urn:ietf:params:rtp-hdrext:toffset\r\na=extmap:3 http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time\r\na=sendrecv\r\na=rtcp-mux\r\na=crypto:1 AES_CM_128_HMAC_SHA1_80 inline:gl34DLHmuMoKoaUWhYJpDJUFkZagn1cedT1x6nQh\r\na=rtpmap:100 VP8/90000\r\na=rtcp-fb:100 ccm fir\r\na=rtcp-fb:100 nack\r\na=rtcp-fb:100 nack pli\r\na=rtcp-fb:100 goog-remb\r\na=rtpmap:116 red/90000\r\na=rtpmap:117 ulpfec/90000\r\na=ssrc:477546681 cname:aIdRfz6vBYDbJiEF\r\na=ssrc:477546681 msid:yGvpzuQVRTY2AmSWclrFlBZctrOijzNQkLnN 6d5c1c40-6921-40d2-ba53-f413afb76ad1\r\na=ssrc:477546681 mslabel:yGvpzuQVRTY2AmSWclrFlBZctrOijzNQkLnN\r\na=ssrc:477546681 label:6d5c1c40-6921-40d2-ba53-f413afb76ad1\r\n"
    }

We can see from above that since it is an createOfferOnSuccess event, then we know that it is the local parties SDP. Following this we can see that local Audio is ssrc:1814250626 and local video is ssrc:477546681 . So, to get the stats on the local video, just grab each value array that begins with ssrc_477546681 . It also gives you the log start time and end time in that same json object.
If they value stays the same in the value array (numerous of the same value):

"ssrc_477546681-googFrameHeightInput": {
     "startTime": "2014-05-11T21:26:06.360Z",
     "endTime": "2014-05-11T21:26:19.362Z",
     "values": "[480,480,480,480,480,480,480,480,480,480,480,480,480,480]"
    },

Then you can bet it did not change for each second during the log period.

iswrvxsc

iswrvxsc2#

将转储导入此工具以获得一些有用的交互式图形:
https://fippo.github.io/webrtc-dump-importer/
编辑:固定url

qq24tv8q

qq24tv8q3#

为了更好地分析数据,你可以使用谷歌webrtc团队的testRTC工具。一个简单的演示,如何分析数据在这个链接:https://testrtc.com/docs/analyze-webrtc-dump/

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