IOS allocation problems with MPMoviePlayerViewController - memory-management

Question

in my ipad app in viewDidLoad i set up a video in the first view so to have an intro.
In allocation tool i see that allocated memory grow till 120MB when running the video, ok i dont care, but after the video finish i would like that memory to go to 0 again BUT stick to 120MB, what am i doing wrong ?
- (void)viewDidLoad{
NSString *url = [[NSBundle mainBundle]
pathForResource:#"sfed"
ofType:#"mp4"];
playerViewController = [[MPMoviePlayerViewController alloc]
initWithContentURL:[NSURL fileURLWithPath:url]];
[[NSNotificationCenter defaultCenter]
addObserver:self
selector:#selector(movieFinishedCallback:)
name:MPMoviePlayerPlaybackDidFinishNotification
object:[playerViewController moviePlayer]];
[videoview addSubview:playerViewController.view];
MPMoviePlayerController *player = [playerViewController moviePlayer];
player.view.frame = CGRectMake(1024, 748, 0, 0);
[player setControlStyle:MPMovieControlStyleNone];
[player play];
}
- (void) movieFinishedCallback:(NSNotification*) aNotification {
MPMoviePlayerController *player = [aNotification object];
[[NSNotificationCenter defaultCenter]
removeObserver:self
name:MPMoviePlayerPlaybackDidFinishNotification
object:player];
[player stop];
[player release];
[UIView beginAnimations:nil context:nil];
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
[UIView setAnimationDuration:1];
[videoview setAlpha:0];
[UIView commitAnimations];
[videoview release];
}