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一次播放多个 YouTube 的最佳方式是什么？我希望它们在毫秒内同步，因此不受缓冲问题或不同长度的广告的影响。

更新1：

如果我能得到以下问题的答案，我认为我的问题将得到充分回答：

当视频能够播放时，如何使用 YouTube 的 javascript API 进行检测（视频已充分缓冲以能够播放/广告未播放/视频未因任何其他原因停止）？

更新2：

YouTube 同步的基本思想是由SwigView完成的。唯一缺少的是让视频更精确地同步，而 SwigView 在实现方面做得并不好。

我开始怀疑当前的 API 是否可行，我正在寻找替代方法。

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1 回答 1

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通过定期测量和调整两个播放器之间的时间差，可以在 0.2 秒或更好的误差范围内同步两个 YouTube iFrame API 播放器。例如，通过将播放器的播放速度加倍或减半并在 X/2 毫秒后将其设置回正常速度，可以非常准确地调整 X 毫秒的时间差。可以从常规 API 曲目中添加用于用户交互（停止、播放、暂停）的助手。它们还包括广告，因为它们会暂停播放器。

代码澄清：

脚本.js

// the players
var player1;
var player2;

// the rules
var syncThreshold=0.2; // seconds, threshold for an acceptable time difference to prevent non-stop syncing
var jumpThreshold=2; // seconds, threshold for a time difference that should be corrected by a rough jump
var jumpDeadTime=500; // milliseconds, a dead time in which we don't sync after a jump

// timeouts and intervals
var timeSyncInterval;
var syncActionTimeout=undefined;

// The YouTube API calls this once it's ready
function onYouTubeIframeAPIReady() {
  player1 = new YT.Player('somediv1', {
    videoId: 'zkv-_LqTeQA',
    events: {
      onReady: syncTime,
      onStateChange: syncStateChange
    }
  });
  player2 = new YT.Player('somediv2', {
    videoId: 'zkv-_LqTeQA'
  });
}

// the syncing magic
function syncTime(){
  // making sure the syncing interval has not been set already for some reason
  clearInterval(timeSyncInterval);
  // setting a 1s interval in which we check it the players are in sync and correct in necessary
  timeSyncInterval = setInterval(function () {
    // if the timeout is already set, we are already trying to sync the players, so we don't have to do it again
    if(syncActionTimeout==undefined){
      // measure the time difference and calculate the duration of the sync-action
      var time1=player1.getCurrentTime();
      var time2=player2.getCurrentTime();
      var timeDifference=time2-time1;
      var timeDifferenceAmount=Math.abs(timeDifference);
      var syncActionDuration=1000*timeDifferenceAmount/2;

      if(timeDifferenceAmount>jumpThreshold){
        // the players are too far apart, we have to jump
        console.log("Players are "+timeDifferenceAmount+" apart, Jumping.");
        player2.seekTo(player1.getCurrentTime());
        // we give the player a short moment to start the playback after the jump
        syncActionTimeout=setTimeout(function () {
          syncActionTimeout=undefined;
        },jumpDeadTime);
      }else if(timeDifference>syncThreshold){
        // player 2 is a bit ahead of player 1, slowing player 2 down
        console.log("Player 2 is "+timeDifference+"s ahead of player 1. Syncing.");
        player2.setPlaybackRate(0.5);
        // setting a timeout that fires precisely when both players are sync
        syncActionTimeout=setTimeout(function () {
          // the players should be sync now, so we can go back to normal speed
          player2.setPlaybackRate(1);
          syncActionTimeout=undefined;
        },syncActionDuration);
      }else if(timeDifference<-syncThreshold){
        console.log("Player 1 is "+(-timeDifference)+"s ahead of player 2. Syncing.");
        // player 1 is bit ahead of player 2, slowing player 2 down
        player2.setPlaybackRate(2);
        // setting a timeout that fires precisely when both players are sync
        syncActionTimeout=setTimeout(function () {
          // the players should be sync now, so we can go back to normal speed
          player2.setPlaybackRate(1);
          // undefining the timeout to indicate that we're done syncing
          syncActionTimeout=undefined;
        },syncActionDuration);
      }
    }
  },1000);
}

// a little helper to deal with the user
function syncStateChange(e){
  if(e.data==YT.PlayerState.PLAYING){
    player2.seekTo(player1.getCurrentTime());
    player2.playVideo();
  }else if(e.data==YT.PlayerState.PAUSED){
    player2.seekTo(player1.getCurrentTime());
    player2.pauseVideo();
  }
}

索引.html

<!DOCTYPE html>
<html>
<head>
        <title>Sync Two Youtube Videos</title>
        <meta name="viewport" content="width=device-width, initial-scale=1.0" />
        <!-- CDN -->
        <script type="text/javascript" src="//www.google.com/jsapi"></script>
        <script type="text/javascript" src="https://apis.google.com/js/client.js?onload=onJSClientLoad"></script>

    <script src="https://www.youtube.com/iframe_api"></script>
    <!-- HOSTED -->
        <script src="script.js"></script>
</head>
<body>
  <div id="somediv1"></div>
  <div id="somediv2"></div>
</body>
</html>
于 2016-07-05T18:32:47.373 回答