YouTube Player API: How to get duration of a loaded/cued video without playing it?

Question

I\'m not able to get the correct video duration/length (in seconds) of a loaded/cued video via the getDuration() method of the YouTube Player API; the same method, however,

Answer 1

Following these steps:
1. Get youtube video id
2. Use youtube API to get duration (ISO 8601 duration)
3. Convert ISO 8601 duration to time

Using Jquery:

// convert ISO 8601 duration
function covtime(youtube_time){
  array = youtube_time.match(/(\d+)(?=[MHS])/ig)||[]; 
    var formatted = array.map(function(item){
        if(item.length<2) return '0'+item;
        return item;
    }).join(':');
    return formatted;
}

// print video duration
$('iframe').each(function(i) {
    var ifr = $(this);
    var regExp = /^.*(youtu\.be\/|v\/|u\/\w\/|embed\/|watch\?v=|\&v=)([^#\&\?]*).*/;
    var match = ifr.attr('src').match(regExp);  // get youtube video id
    if (match && match[2].length == 11) {
        var youtubeUrl = "https://www.googleapis.com/youtube/v3/videos?id=" + match[2] 
        + "&key=AIzaSyDYwPzLevXauI-kTSVXTLroLyHEONuF9Rw&part=snippet,contentDetails";
        $.ajax({
            async: false,
            type: 'GET',
            url: youtubeUrl,
            success: function(data) {
              var youtube_time = data.items[0].contentDetails.duration;
              var duration = covtime(youtube_time); 
              if(ifr.next().is('.time')) {
                ifr.next().html(duration);
              }
            }
        });
    }
});