Xcode Playing a Downloaded Video from the Documents Directory
===

I'm trying to get my app to play a video file that's been downloaded to the documents directory. I know the file is getting downloaded, but I can't seem to get the file to play, here is my code:
   
    -(IBAction)play{
     
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *path = [documentsDirectory stringByAppendingPathComponent:@"%@/piggy.m4v"];
    
    NSURL *movieURL = [NSURL fileURLWithPath:path];

    
    _player = [[MPMoviePlayerController alloc] initWithContentURL:movieURL];
    [self.view addSubview:_player.view];

    _player.controlStyle = MPMovieControlStyleDefault;
    _player.shouldAutoplay = YES;
    
    
    [_player setFullscreen:YES animated:YES];
    
    
    [_player play];

    }