node-rtsp-stream +jsmpeg 低延迟视频推流显示方案

需要ffmpeg，node环境
需要node启动websocket ，前台使用jsmpeg直接接收显示
服务端代码如下，可在electron中写 一体化

const Stream = require('node-rtsp-stream');
import express from 'express';
const app = express();
// let router = express.Router();
// 设置rtsp视频流
// const rtsp_url = 'rtsp://192.168.1.10:554/stream1'
const rtsp_url = 'rtsp://admin:hiwei713@192.168.1.65:554/h264/ch33/main/av_stream'
var streams = {}

app.all('*', function (req, res, next) {
  res.header("Access-Control-Allow-Origin", req.headers.origin);
  // res.header("Access-Control-Allow-Origin", '*');
  res.header("Access-Control-Allow-Headers", "Content-Type,Content-Length, Authorization, Accept,X-Requested-With");
  res.header("Access-Control-Allow-Methods", "PUT,POST,GET,DELETE,OPTIONS");
  res.header("Access-Control-Allow-Credentials", "true");
  res.header("X-Powered-By", ' 3.2.1')
  if (req.method === "OPTIONS") res.send(200);/*让options请求快速返回*/
  else next();
});
//开启一路新视频
function setNew(id, rtsp) {
  var size= '1920*1080'
  return streams[id] = new Stream({
    name: 'sockets',
    // streamUrl: 'rtsp://admin:hiwei713@192.168.1.65:554/h264/ch33/main/av_stream',
    streamUrl: rtsp ? rtsp : rtsp_url,
    wsPort: `998${id}`,
    ffmpegOptions: { // 选项ffmpeg标志
      '-stats': '', // 没有必要值的选项使用空字符串
      '-r': 30, // 具有必需值的选项指定键后面的值<br>　　　　
      '-s': size,
      '-b:v': '4000k'
    }
  })
}
// 关闭一路
function closeS(id) {
  if (streams[id]) {
    streams[id].wsServer.close()
    streams[id].mpeg1Muxer.stream.kill()
    streams[id] = null
  }
}
app.get('/open', (req, res) => {
  if (!streams[req.query.id]) {
    streams[req.query.id] =
      setNew(req.query.id, req.query.rtsp ? req.query.rtsp : 'rtsp://admin:hiwei713@192.168.1.65:554/h264/ch33/main/av_stream')
  }
  res.send("123");
});

app.get('/close', (req, res) => {
  //关闭已经开启的websocket

  if (req.query.id == 'all') {
    // streams
    for (let i = 1; i < 8; i++) {
      console.log(streams[i])
      if (streams[i]) {
        closeS(i)
      }
    }
  } else {
    closeS(req.query.id)
  }
  console.log('关闭')
  res.send("关闭成功");
});



app.listen(1111, function () {
  console.log('启动')

})

可实时开启关闭websocket
前台使用JSMpeg 加载websocket链接就好，延迟可做到500ms，也是我试验了rtsp转flv，rtmp 延迟最低的方式