MPMoviePlayerController垃圾邮件“收到的内存警告”

Question

I'm adding a MPMoviePlayerController as background view and while it plays I get spams of the log-message 'Received memory warning'. I don't now why, and maybe there is a workaround or a better solution.

Here is my code:

- (void)viewWillAppear:(BOOL)animated{
    [super viewWillAppear:animated];

    [[self navigationController]setNavigationBarHidden:YES animated:YES];

    [moviePlayer play];

}

- (void) viewDidDisappear:(BOOL)animated{
    [super viewDidDisappear:animated];

    [moviePlayer pause];

    [[NSNotificationCenter defaultCenter] removeObserver:self];
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.

    //self.view.backgroundColor = [UIColor appStyleLightOrangeColor];

    //Add Video playback
    NSBundle *bundle = [NSBundle mainBundle];
    NSString *moviePath = [bundle pathForResource:@"happy-female-friends-smartphon" ofType:@"m4v"];
    NSURL *movieURL = [NSURL fileURLWithPath:moviePath];

    moviePlayer = [[MPMoviePlayerController alloc] initWithContentURL:movieURL];
    moviePlayer.controlStyle = MPMovieControlStyleNone;
    moviePlayer.shouldAutoplay = YES;
    moviePlayer.repeatMode = MPMovieRepeatModeOne;
    moviePlayer.fullscreen =  YES;
    moviePlayer.movieSourceType = MPMovieSourceTypeFile;
    moviePlayer.scalingMode = MPMovieScalingModeAspectFill;
    //set the frame of movie player
    moviePlayer.view.frame = self.view.bounds;


    [self.view insertSubview:moviePlayer.view atIndex:0];


    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(appBecameActive)
                                                 name:UIApplicationDidBecomeActiveNotification
                                               object:nil];

    [self performSelector:@selector(animationCode) withObject:nil afterDelay:0.1f];
}

-(void)appBecameActive{
    [moviePlayer play];
}

Answer 1

The log says it all. You are receiving a printed warning that you are using too much memory and your app will shutdown if you do not free up space. You need to take immediate steps to lower your memory line, so don't just shrug off those warnings. Yeah, your app might not crash immediately, but it is often a sign of a much bigger problem in your code setup.

Run the Allocations Instrument in XCode to see where the bulk of your memory is being used. I'd first check the size of that m4v video also. You should be streaming the video if it is a significant size. Additionally, ensure that you are not leaking memory using the Leaks instrument. But once again, when you receive the didReceiveMemoryWarning callback, take immediate action. Either pick up the notification in the AppDelegate or subscribe to the UIApplicationDidReceiveMemoryWarningNotification and release items/viewControllers that can be recreated later.

Here's the Memory Management Guide if you want to consult.

Answer 2

Thannks first to @tdevoy for your advices.

I finally got rid of the warning. It was the file type! I had to convert it to .3gp and now it works much smoother and without warnings.

On strange thing is I even use now 4mb more memory than before. But everything works great..