let interval = CMTime(value: 1, timescale: 1)
self.audioPlayer?.addPeriodicTimeObserver(forInterval: interval, queue: DispatchQueue.main, using: { (progressTime) in

let secondsProgress = CMTimeGetSeconds(progressTime)

    let secondsStringProgress = String(format: "%02d", Int((secondsProgress.truncatingRemainder(dividingBy: 60))))
    let minuitesStringProgress = String(format: "%02d", Int(secondsProgress) / 60)
    //self.countDownLabel.text = "(minuitesStringProgress):(secondsStringProgress)"

    if let duration = self.audioPlayer?.currentItem!.asset.duration {

        let secondsDuration = CMTimeGetSeconds(duration)

            let secondsStringDuration = String(format: "%02d", Int((secondsDuration.truncatingRemainder(dividingBy: 60))))
            let minuitesStringDuration = String(format: "%02d", Int(secondsDuration) / 60)

                let secondsString = String(format: "%02d", Int(secondsStringDuration)! - Int(secondsStringProgress)!)
                let minuitesString = String(format: "%02d", Int(minuitesStringDuration)! - Int(minuitesStringProgress)!)

            self.countDownLabel.isHidden = false
            self.countDownLabel.text = "(minuitesString):(secondsString)"

        self.horizontalSlider.value = Float(secondsProgress / secondsDuration)
        self.circleSlider.value = Float(secondsProgress / secondsDuration)

    }
})