如何从socket.io>3ver发送blob视频。？

navigator.mediaDevices.getUserMedia({ video: true })
  .then(stream => {
    const mediaRecorder = new MediaRecorder(stream);
    const chunks = [];

    mediaRecorder.ondataavailable = e => {
      if (e.data.size > 0) {
        chunks.push(e.data);
      }
    };

    mediaRecorder.onstop = () => {
      const blob = new Blob(chunks, { type: 'video/webm' });
      // 将blob发送给后端
      socket.emit('video', blob);
    };

    // 开始录制
    mediaRecorder.start();

    // 一段时间后停止录制
    setTimeout(() => {
      mediaRecorder.stop();
    }, 5000);
  })
  .catch(error => {
    console.error('Error accessing media devices.', error);
  });

const io = require('socket.io')(server);

io.on('connection', socket => {
  socket.on('video', blob => {
    // 广播视频给其他客户端
    socket.broadcast.emit('video', blob);
  });
});

socket.on('video', blob => {
  const videoElement = document.getElementById('video');
  videoElement.src = URL.createObjectURL(blob);
});