<div id="youtube_player" class="youtube-player" data-youtube-id="<?php echo get_youtube_id_from_url("url"); ?>"></div>
<script>
  // 2. This code loads the IFrame Player API code asynchronously.
  var tag = document.createElement('script');

  tag.src = "https://www.youtube.com/iframe_api";
  var firstScriptTag = document.getElementsByTagName('script')[0];
  firstScriptTag.parentNode.insertBefore(tag, firstScriptTag);

  // 3. This function creates an <iframe> (and YouTube player)
  //    after the API code downloads.
  var player;
  
  function onYouTubeIframeAPIReady() {
    var w = window.innerWidth || document.documentElement.clientWidth || document.body.clientWidth;
    var h = window.innerHeight || document.documentElement.clientHeight || document.body.clientHeight;
    if (w > 970) {
      w = 785;
      h = 400;
    }else{
      w = w;
      h = (w*9)/16;
    }
    var video_id = '';
    video_id = document.getElementById('youtube_player').getAttribute('data-youtube-id');
    player = new YT.Player('youtube_player', {
      height: h,
      width: w,
      videoId: video_id,
      events: {
        'onReady': onPlayerReady,
        'onStateChange': onPlayerStateChange
      }
    });
  }

  // 4. The API will call this function when the video player is ready.
  function onPlayerReady(event) {
    event.target.playVideo();
  }

  // 5. The API calls this function when the player's state changes.
  //    The function indicates that when playing a video (state=1),
  //    the player should play for six seconds and then stop.
  var done = false;
  function onPlayerStateChange(event) {
    if (event.data == YT.PlayerState.PLAYING && !done) {
      setTimeout(stopVideo, 6000);
      done = true;
    }
  }
  function stopVideo() {
    player.stopVideo();
  }
</script>