AVCaptureSession start memory warnings - objective-c

Question

each time I start a AVCaptureSession I receive a memory warning leading to crashes after time.
I'm starting the session asynchronously and the Instruments tool says the application consumes about 2 MB memory.
Do you have any idea how to overcome that issue? Are 2MB of allocated memory too much?
Thankx!
[iOS 4.3, ARC]
#autoreleasepool {
//Init capture session
session = [[AVCaptureSession alloc] init];
session.sessionPreset = AVCaptureSessionPresetPhoto;
//Resize container view
CGRect cameraContainerFrame = cameraContainerView.frame;
cameraContainerFrame.size = CGSizeMake(320, 426);
cameraContainerView.frame = cameraContainerFrame;
CALayer *viewLayer = [cameraContainerView layer];
[viewLayer setMasksToBounds:YES];
//Create preview layer
captureVideoPreviewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:session];
CGRect bounds = [cameraContainerView bounds];
[captureVideoPreviewLayer setFrame:bounds];
if ([captureVideoPreviewLayer isOrientationSupported]) {
[captureVideoPreviewLayer setOrientation:AVCaptureVideoOrientationPortrait];
}
[captureVideoPreviewLayer setVideoGravity:AVLayerVideoGravityResizeAspectFill];
[viewLayer addSublayer:captureVideoPreviewLayer];
//Get input device
captureDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
if ([captureDevice lockForConfiguration:nil]){
captureDevice.focusMode = AVCaptureFocusModeContinuousAutoFocus;
captureDevice.whiteBalanceMode = AVCaptureWhiteBalanceModeContinuousAutoWhiteBalance;
[captureDevice unlockForConfiguration];
}
NSError *error = nil;
AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:captureDevice error:&error];
if (!input) {
// Handle the error appropriately.
DLog(#"ERROR: trying to open camera: %#", error);
}
//Add input to session
[session addInput:input];
//Output
stillImageOutput = [[AVCaptureStillImageOutput alloc] init];
NSDictionary *outputSettings = [NSDictionary dictionaryWithObject:AVVideoCodecJPEG forKey:AVVideoCodecKey];
[stillImageOutput setOutputSettings:outputSettings];
[session addOutput:stillImageOutput];
//Save state
cameraSessionInitialized = YES;
[session startRunning];
}

Answer 1

session.sessionPreset = AVCaptureSessionPresetMedium;
If you don't care about quality, this does get rid of memory warnings. I'm trying to figure out how to get it working with the AVCaptureSessionPresetPhoto.