AVPlayer plays on simulator but doesn't on a real device - objective-c

Question

I'm implementing a basic audio player in order to play remote audio files. Files are in format mp3.
The code I wrote is working fine on the simulator but doesn't work on a real device. However the same url I use within my app works fine if I load it by using safari (on the same real device) so I'm not really getting the missing point.
Below is my code:
self.musicPlayer = [AVPlayer playerWithURL:[NSURL URLWithString:urlTrack]];
[self.musicPlayer play];
something extremely easy. The music player property is defined as
#property (nonatomic, retain) AVPlayer *musicPlayer;
I also tried using an AVPlayerItem but the result is the same. Here is the code I have used
AVPlayerItem *playerItem = [AVPlayerItem playerItemWithURL:[NSURL URLWithString:urlTrack]];
self.musicPlayer = [AVPlayer playerWithPlayerItem:playerItem];
[self.musicPlayer play];
Finally I tried to use the code below
self.musicPlayer = [AVPlayer playerWithURL:[NSURL URLWithString:urlTrack]];
NSLog(#"Player created:%d",self.musicPlayer.status);
[self.musicPlayer addObserver:self forKeyPath:#"status" options:0 context:nil];
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
NSLog(#"Player created:%d",self.musicPlayer.status);
if (object == self.musicPlayer && [keyPath isEqualToString:#"status"]) {
if (self.musicPlayer.status == AVPlayerStatusReadyToPlay) {
[self.musicPlayer play];
} else if (self.musicPlayer.status == AVPlayerStatusFailed) {
// something went wrong
}
}
}
When the method observeValueForKeyPath is invoked the player status is 1 and the play is exectuted but still not sound.
I tried several files like:
http://www.nimh.nih.gov/audio/neurogenesis.mp3
http://www.robtowns.com/music/blind_willie.mp3
Any idea?
Tnx

Answer 1

Check the spelling of your filename. The device is case-sensitive, the simulator is not...
Also, check if your ringer is off, you won't hear any sound when it's off. To prevent that, use
NSError *_error = nil;
[[AVAudioSession sharedInstance] setCategory: AVAudioSessionCategoryPlayback error: &_error];
right before where you init the player

Answer 2

i have tried all the things but did not work, the only think that work for me AVAudioSession to playBack
here is the code i used
private var audioPlayer: AVAudioPlayer!
guard let path = Bundle.main.path(forResource: name, ofType: "mp3") else {
print("can not find path")
return
}
let url = URL(fileURLWithPath: path)
do {
try AVAudioSession.sharedInstance().setCategory(.playback)
audioPlayer = try AVAudioPlayer(contentsOf: url)
} catch {
print("some thing went wrong: \(error)")
}
audioPlayer!.prepareToPlay()
audioPlayer!.play()
please do not ignore the line in the above code
try AVAudioSession.sharedInstance().setCategory(.playback)