Cordova Media Plugin media.getDuration

I am using ionic to build a stream audio player (spotify like) and trying to build the player using cordova media plugin.

I tried to follow the instruction in Cordova media plugin page to get duration, but it showing a different result.

The audio file (.ogg) that I upload has 4:18, but in my android, it only has 3:17. Is there something wrong with the code?

here is my getDuration Method

var self = this;
var counter = 0;
var timerDur = $interval(function() {
counter = counter + 100;
if (counter > 2000)

{ $interval.cancel(timerDur); }

var dur = self.media.getDuration();
if (dur > 0) {
$interval.cancel(timerDur);
//document.getElementById('audio_duration').innerHTML = (dur) + " sec";
self.duration = dur * 1000;
}}, 100);