Audio file not working on device but it is working on simulator

Question

I am playing audio in iphone app but problem is that it works fine on simulator but it is not working on device here is my code it just closes the app when this code runs.

         NSString*thePath=[[NSBundle mainBundle] pathForResource:fileName ofType:@"MP3"];
    NSURL*url=[NSURL fileURLWithPath:thePath];



    //NSURL *url = [NSURL URLWithString:@"http://celeritas-solutions.com/pah_brd_v1/productivo/1.mp3"];
    mp = [[MPMoviePlayerViewController alloc] initWithContentURL:url];
    [[mp moviePlayer] prepareToPlay];
    [[mp moviePlayer] setUseApplicationAudioSession:NO];
    [[mp moviePlayer] setShouldAutoplay:YES];
    [[mp moviePlayer] setControlStyle:2];
    [[mp moviePlayer] setRepeatMode:MPMovieRepeatModeOne];
    [self presentMoviePlayerViewControllerAnimated:mp];

Here is the video code this also works on simulator but not on iphone

         NSString*thePath=[[NSBundle mainBundle] pathForResource:fileName ofType:@"MP4"];
    NSURL*url=[NSURL fileURLWithPath:thePath];
    //NSURL *url = [NSURL URLWithString:@"http://celeritas-solutions.com/pah_brd_v1/productivo/1.mp4"];
    mp = [[MPMoviePlayerViewController alloc] initWithContentURL:url];
    [[mp moviePlayer] prepareToPlay];
    [[mp moviePlayer] setUseApplicationAudioSession:NO];
    [[mp moviePlayer] setShouldAutoplay:YES];
    [[mp moviePlayer] setControlStyle:2];
    [[mp moviePlayer] setRepeatMode:MPMovieRepeatModeOne];
    [self presentMoviePlayerViewControllerAnimated:mp];

Answer 1

try this code...

NSString *path = [[NSBundle mainBundle] pathForResource:fileName ofType:@"mp3"];
AVAudioPlayer* theAudio=[[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:path] error:NULL];
theAudio.delegate=self;
[theAudio play];

first check the file is stored in your project folder or not and also that variable is not nil.

Also Check Out this Link play-mp3-files-with-iphone-sdk

And this tutorial how-to-play-audio-and-video-in-iphone

UPDATE:

MPMoviePlayerViewController *Mpplayer =[[MPMoviePlayerViewController alloc] initWithContentURL: [url standardizedURL]];
Mpplayer.moviePlayer.movieSourceType = MPMovieSourceTypeUnknown;  
[self presentModalViewController:Mpplayer animated:YES];
[[Mpplayer moviePlayer] play];

Answer 2

First add AVFoundation.framework and add below code.

in .h file

#import <AVFoundation/AVFoundation.h>

and .m file

 [[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];