的script.js

Question

一次播放多个YouTube的最佳方式是什么？我希望它们在毫秒级内同步，因此不会受到缓冲问题或不同长度广告的影响。

更新1：

如果我能回答以下问题，我认为我的问题会得到充分回答：

当视频能够播放时，如何使用YouTube的javascript API进行检测（视频已经足够缓冲以便播放/广告不播放/视频不会因任何其他原因而暂停）？

更新2：

YouTube同步的基本理念已由SwigView完成。唯一缺少的是视频可以更准确地同步，而SwigView没有很好地实现。

我开始怀疑使用当前的API甚至是可能的，我正在寻找替代方法。

Answer 1

通过定期测量和调整两个玩家之间的时差，可以在0.2秒或更好的容差范围内同步两个YouTube iFrame API播放器。例如，通过将一个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，可以非常精确地完成对X毫秒的时间差的调整。可以从常规API指令库中添加用于用户交互（停止，播放，暂停）的助手。他们还会报道广告，因为他们会暂停播放。

澄清的代码：

的script.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();
  }
}

的index.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>

同步多个YouTube视频

1 个答案:

的script.js

的index.html