在github上搜到说可以用node-rtsp-stream来转码视频流，
根据https://www.npmjs.com/package...上写的，
我npm install node-rtsp-stream以后，在node上执行

Stream = require('node-rtsp-stream');
stream = new Stream({
    name: 'name',
    streamUrl: 'rtsp://184.72.239.149/vod/mp4:BigBuckBunny_115k.mov',
    wsPort: 9999
});

之后在js里写的

client = new Websocket('ws://localhost:9999');
player = new jsmpeg(client, {
    canvas: canvas // Canvas should be a canvas DOM element
});

我不明白Websocket里这个地址是什么地址？，求大神