Question

   if (mPlayerItem){
    [mPlayerItem removeObserver:self forKeyPath:kStatusKey];

    [[NSNotificationCenter defaultCenter] removeObserver:self
                                                    name:AVPlayerItemDidPlayToEndTimeNotification
                                                  object:mPlayerItem];
}

//create AVPlayerItem
NSURL *url = [self getUrlWithROAudio:audioFile];

mPlayerItem = [AVPlayerItem playerItemWithURL:url];
[mPlayerItem    addObserver:self
                forKeyPath:kStatusKey
                options:NSKeyValueObservingOptionInitial | NSKeyValueObservingOptionNew
                context:nil];

[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(playerItemDidReachEnd:)
                                             name:AVPlayerItemDidPlayToEndTimeNotification
                                           object:mPlayerItem];

when i create a new AVPlayerItem , i will check if last one is exist, and removeObserver
but i got
-[AVPlayerItem removeObserver:forKeyPath:]: message sent to deallocated instance

anyone know why?

Answer 1

At some point, the object pointed to by mPlayerItem is being released, but mPlayerItem is not being set to nil. Look for places where you may be under-retaining or over-releasing your player instances.