my code to handle seek process:
MusicPlayer.swift
func seek(timeTo: Double) {
		
		let seekTime = CMTime(seconds: timeTo, preferredTimescale: 1)
		
		isPlaying = .Seek
		player.pause()
		player.seek(to: seekTime, toleranceBefore: .zero, toleranceAfter: .positiveInfinity, completionHandler: { [weak self] result in
				self?.presenter?.checkState_Seek(state: (self?.isPlaying)!)
		})
}
ViewController.Swift
@IBAction func seeking(_ sender: UISlider) {
		
		let second = Float((duration / 100)) * progressBar.value
		
		MusicPlayer.sharedInstance.seek(timeTo: Double(second))
}
Note: this issue happend only when seek on play streaming online with .flac format if I seek the song, it work normal if it seek on play streaming online with .mp3 and .m4a format
jan272
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this is the log of progress time and duration of song :
log progress time and duration - https://developer.apple.com/forums/content/attachment/685ef579-70d7-4864-9dd3-a9fdb7627d31
observer that I use to update the duration and progress time:
var timeObserver: Any?
override open func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
		if let item = object as? AVPlayerItem, let keyPath = key, item == playerItem {
						
						switch keyPath {
						case "duration":
								let duration = Double(item.duration.seconds)
								
								print("Update display Duration in second: \(duration)")
								
								controller?.doUpdateDuration(duration: duration)
								self.timeObserver = player.addPeriodicTimeObserver(forInterval: interval, queue: .main, using: { time in
										
										self.playerDelegate?.updateProgresTime(time: time.seconds)
								})
								
						default:
								break
						}
						
				}
}
Sorry, Is there any update of this issue? This issue happend when set option AVURLAssetPreferPreciseDurationAndTimingKey = true on AVURLAsset
Update:
this issue happend when play audio file with flac format