小编Aja*_*ary的帖子

我使用了这种方法并获得了多个图像.我能够成功创作一部电影但我的问题是,当我播放电影时,它似乎播放得太快,即电影没有所有画面.这是我的代码.

-(UIImage *)uiImageScreen
{
  CGImageRef screen = UIGetScreenImage();
  UIImage* image = [UIImage imageWithCGImage:screen];
  CGImageRelease(screen);
  UIImageWriteToSavedPhotosAlbum(image, self,nil, nil);
  return image;
}

-(void) writeSample: (NSTimer*) _timer 
 {
if (assetWriterInput.readyForMoreMediaData) {
    // CMSampleBufferRef sample = nil;

    CVReturn cvErr = kCVReturnSuccess;

    // get screenshot image!
    CGImageRef image = (CGImageRef) [[self uiImageScreen] CGImage];
    NSLog (@"made screenshot");

    // prepare the pixel buffer
    CVPixelBufferRef pixelBuffer = NULL;
    CFDataRef imageData= CGDataProviderCopyData(CGImageGetDataProvider(image));
    NSLog (@"copied image data");
    cvErr = CVPixelBufferCreateWithBytes(kCFAllocatorDefault,
                                         FRAME_WIDTH,
                                         FRAME_HEIGHT,
                                         kCVPixelFormatType_32BGRA,
                                         (void*)CFDataGetBytePtr(imageData),
                                         CGImageGetBytesPerRow(image),
                                         NULL,
                                         NULL,
                                         NULL,
                                         &pixelBuffer);
    NSLog …