function syncPlaylist(seconds) {
    var durationSecondSelectors = document.querySelectorAll('.amplitude-duration-seconds[data-amplitude-playlist="' + _config2.default.active_playlist + '"]');

    for (var i = 0; i < durationSecondSelectors.length; i++) {
      var songIndex = durationSecondSelectors[i].getAttribute("data-amplitude-song-index");

      if (songIndex == null) {
        durationSecondSelectors[i].innerHTML = seconds;
      }
    }
  }
Syncs the playlist duration seconds for the audio.

@param {Integer} seconds - The duration seconds for the audio.