Javascript 使用MP4box.js和onSegment回调不会被调用

基本问题：在浏览器中显示H264实时流

解决方案：让我们把它转换成片断化的mp4，然后通过websocket（或XHR）逐块加载到MSE中

听起来太容易了。但是我想用纯JS在客户端执行分段

所以我试着用。在自述页面上，它写道：它有一个演示：“一个在飞行中执行碎片分割的玩家”

这就是我需要的东西

但是，根本不调用应为MSE提供反馈的onSegment回调：

var ws;      //for websocket
var mp4box;  //for fragmentation


function startVideo() {
  mp4box = MP4Box.createFile();

  mp4box.onError = function(e) {
    console.log("mp4box failed to parse data.");
  };

  mp4box.onMoovStart = function () {
    console.log("Starting to receive File Information");
  };

  mp4box.onReady = function(info) {
    console.log(info.mime);

    mp4box.onSegment = function (id, user, buffer, sampleNum) {
      console.log("Received segment on track "+id+" for object "+user+" with a length of "+buffer.byteLength+",sampleNum="+sampleNum);
    }

    var options = { nbSamples: 1000 };
    mp4box.setSegmentOptions(info.tracks[0].id, null, options); // I don't need user object this time
    var initSegs = mp4box.initializeSegmentation();
    mp4box.start();
  };

  ws = new WebSocket("ws://a_websocket_server_which_serves_h264_file");
  ws.binaryType = "arraybuffer";
  ws.onmessage = function (event) {
    event.data.fileStart = 0; //tried also with event.data.byteOffset, but resulted error.
    var nextBufferStart = mp4box.appendBuffer(event.data);
    mp4box.flush(); //tried commenting out - unclear documentation!
  };
} 


window.onload = function() {
  startVideo();
}

现在，将其放入HTML文件将导致JavaScript控制台：

Starting to receive File Information
video/mp4; codecs="avc1.4d4028"; profiles="isom,iso2,avc1,iso6,mp41"

但之后什么也没发生为什么不在这里调用onSegment？（websocket服务器提供的h264文件可以在VLC中播放-但是它不是碎片化的）

问题是以错误的方式使用nextBufferStart

这应该是正确的：

var nextBufferStart = 0;
...
ws.onmessage = function (event) {
    event.data.fileStart = nextBufferStart;
    nextBufferStart = mp4box.appendBuffer(event.data);
    mp4box.flush();
};