ios - 在基本项目中使用 GPUImage 实时视频过滤器会导致纯白屏幕

Question

我刚刚将 GPUImage 集成到一个全新的项目中，并按照 Github 中的说明添加了所需的库。页。我已经为GPUImageVideoCamera创建了一个strong属性，并在viewDidLoad中，我将其实例化如下:

self.videoCamera = [[GPUImageVideoCamera alloc] initWithSessionPreset:AVCaptureSessionPreset640x480 cameraPosition:AVCaptureDevicePositionBack];

编辑:项目中的完整代码:

@interface ViewController () <GPUImageVideoCameraDelegate>
{
    GPUImageVideoCamera *videoCamera;
}

@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    videoCamera = [[GPUImageVideoCamera alloc] initWithSessionPreset:AVCaptureSessionPreset640x480 cameraPosition:AVCaptureDevicePositionBack];
}

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    videoCamera.outputImageOrientation = UIInterfaceOrientationPortrait;

    GPUImagePixellatePositionFilter *customFilter = [[GPUImagePixellatePositionFilter alloc] init];
    GPUImageView *filteredVideoView = [[GPUImageView alloc] initWithFrame:CGRectMake(0.0, 0.0, self.view.frame.size.width, self.view.frame.size.height)];

    [videoCamera addTarget:customFilter];
    [customFilter addTarget:filteredVideoView];

    [videoCamera startCameraCapture];
}

@end

但是，我得到的只是一个白屏，没有任何错误或警告，并且想知道我做错了什么......谢谢!

Answer 1

我知道这是一个老问题，但我遇到了同样的问题并找到了解决方法。这看起来真的很愚蠢，但对我来说，我只是将 videoCamera 设为一个属性，它就开始工作了，即:

@interface ViewController ()

@property (nonatomic, strong) GPUImageVideoCamera *camera;

@end

-(void)viewDidLoad {
    [super viewDidLoad];
    self.camera = [[GPUImageVideoCamera alloc] initWithSessionPreset:AVCaptureSessionPreset640x480 cameraPosition:AVCaptureDevicePositionBack];

    //etc.
}