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我想从 iPhone 相机中获取连续帧并将其放在 UIImage 上。我已按照此链接中的代码进行操作

我的启动相机代码是

- (IBAction)luanchCamera:(id)sender
{

    UIImagePickerController *controller=[[UIImagePickerController alloc]init];
    controller.sourceType = UIImagePickerControllerSourceTypeCamera;
    controller.mediaTypes =[NSArray arrayWithObject:(NSString *)kUTTypeMovie];
    controller.showsCameraControls = YES;
    imageFrameView=[[UIImageView alloc]initWithFrame:CGRectMake(0, 0,1024,718)];
    [controller.view addSubview:imageFrameView];
    controller.view.backgroundColor=[UIColor clearColor];
    controller.wantsFullScreenLayout=NO;
    controller.cameraViewTransform = CGAffineTransformScale(controller.cameraViewTransform,0.25, 0.25);
    [self setupCaptureSession];
    [self presentViewController:controller animated:YES completion:nil];

}

但我只从视频中得到一帧我也删除了 

// Assign session to an ivar.

    [self setSession:session];

从我的代码。是否有必要启动我在 launchCamera 方法中编写的相机。如何从视频中获取连续帧？

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