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1.获取会话id和hid
curl -X POST -H "Content-Type: application/json" -d '{"janus": "list_sessions", "transaction": "123", "admin_secret": "janusoverlord"}' http://localhost:7088/admin
curl -X POST -H "Content-Type: application/json" -d '{"janus": "list_sessions", "transaction": "123", "admin_secret": "janusoverlord"}' http://localhost:7088/admin

2.启动janus抓包和停止抓包，抓取rtp明文
curl -X POST -H "Content-Type: application/json" -d '{"janus": "start_pcap", "folder": "/tmp", "filename": "my-test2pcap-dump.pcap", "transaction": "123", "admin_secret": "janusoverlord"}' http://localhost:7088/admin/sessionId/handleId
curl -X POST -H "Content-Type: application/json" -d '{"janus": "stop_pcap", "transaction": "123", "admin_secret": "janusoverlord"}' http://localhost:7088/admin/sessionId/handleId