iOS中的内存泄漏，AVPlayer从未释放

我使用了Apple文档中的AVPlayerDemo示例，并在其上面编写了自己的UI来播放从UITableViewController中选择的视频。现在，问题是我找不到的某个地方存在内存泄漏。问题是AVPlayer对象没有被取消分配，我猜这是因为每次按下后退按钮并选择要播放的新视频时，该应用程序消耗的总内存就会大幅增加，如下所示：

第一次播放视频时，内存使用量为36.6MB，现在是第二次：

Here it has jumped to 58.2MB, and keeps on increasing every time i go back and play the video again or a different video.

I have tried using Instruments with Leaks but haven't yet been able to figure out whats wrong with it.

Heres the whole Controller file code.

//EDIT

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

    if(_player.rate == 1.0){
        [_player pause];
    }

    [idleTimer invalidate];

    if(mTimeObserver){
        [_player removeTimeObserver:mTimeObserver];
        mTimeObserver = nil;
    }
    [_playerItem removeObserver:self forKeyPath:kStatusKeyT];
    [[NSNotificationCenter defaultCenter] removeObserver:self                                                 name:AVPlayerItemDidPlayToEndTimeNotification object:_playerItem];


    _player = nil;
    _playerItem = nil;
    idleTimer = nil;
    _tapGestureRecognizer = nil;
}

-(void) dealloc
{
    NSLog(@"DEALLOCING");
}