ios – 在电影文件上使用GPUImageLookupFilter会产生黑屏

Header File Sample
GPUImagePicture *lookupImagesource;
GPUImageOutput<GPUImageInput> *filter;
GPUImageMovie *movieFile;
GPUImageMovieWriter *movieWriter;
@property(nonatomic,strong) GPUImagePicture *lookupImagesource;



Main File
filter = [[GPUImageFilterGroup alloc] init];

            self.lookupImagesource = [[GPUImagePicture alloc] initWithImage:[UIImage imagenamed:@"ExtremeVintage1.png"]];

            GPUImageLookupFilter * filterLookup = [[GPUImageLookupFilter alloc] init];

            [self.lookupImagesource addTarget:filterLookup];

            [self.lookupImagesource processImage];

            [(GPUImageFilterGroup *)filter addFilter:filterLookup];



            [(GPUImageFilterGroup *)filter seTinitialFilters:[NSArray arrayWithObject:filterLookup]];
            [(GPUImageFilterGroup *)filter setTerminalFilter:filterLookup];


            [movieFile addTarget:filter];

谢谢

****更新*****

新代码

self.lookupImagesource = [[GPUImagePicture alloc] initWithImage:[UIImage    imagenamed:@"ExtremeVintage1.png"]];
            [self.lookupImagesource processImage];

            filter = [[GPUImageLookupFilter alloc] init];
            [lookupImagesource addTarget:filter];

            [movieFile addTarget:filter];