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... [self.videoCamera stop]; // after this last frame remains within 10 sec ... - (void)viewDidLoad { [super viewDidLoad]; // Start OpenCV camera self.videoCamera = [[CvVideoCamera alloc] initWithParentView:_imageView]; self.videoCamera.delegate = self; self.videoCamera.defaultAVCaptureDevicePosition = AVCaptureDevicePositionFront; self.videoCamera.defaultAVCaptureSessionPreset = AVCaptureSessionPresetPhoto; self.videoCamera.defaultAVCaptureVideoOrientation = AVCaptureVideoOrientationPortrait; [self.videoCamera start]; }