AVplayer currentTime() display wrong duration after seek flac online streaming song

Question

Created Nov ’20

Replies 5

Boosts 0

Views 3.0k

Participants 3

So I try to play online streaming song with format song is flac.

The problem is when I seek song duration the player always end the song at wrong duration like this (video demo on this post):

https://stackoverflow.com/questions/64640693/avplayer-currenttime-display-wrong-duration-after-seek-flac-online-streaming-s

Even though it can be fix by add AVURLAssetPreferPreciseDurationAndTimingKey = true at AVURLAsset options is the any other way to fix this? Because using AVURLAssetPreferPreciseDurationAndTimingKey cause load the song take too long time especially when the connection is poor

Source Code sample:
https://github.com/cendolinside123/sample-musicplayeR

tested on iOS: 13.1.2

Boost

Answer 1

jan272 OP

Nov ’20

my code to handle seek process:
MusicPlayer.swift

Code Block 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

Code Block @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

0

Answer 2

Media Engineer OP

Apple

Nov ’20

My understanding is that AVURLAssetPreferPreciseDurationAndTimingKey is exactly the correct solution for this sort of problem. The reason it is optional is that it carries performance tradeoffs, as you have discovered.

0

Answer 3

jan272 OP

Nov ’20

this is the log of progress time and duration of song :

log progress time and duration

observer that I use to update the duration and progress time:

Code Block 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
            }
            
        }
}

0

Answer 4

jan272 OP

Nov ’20

Update:

this issue happend when play audio file with flac format

0

Answer 5

yaoguai OP

Sep ’24

hi , Is there any progress on this issue?

0