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我想抓住UIView,转换为图像,并将该图像存储在视频文件(.mp4)中。 我使用哪个抓住图像并将其用于像素缓冲器的代码的下部分:IOS 5:UIView转换为视频并导致视频损坏
BOOL appended;
if(input.readyForMoreMediaData==YES){
//grab the view and convert it into image
CGSize imgsize=self.imageSource.frame.size;
UIGraphicsBeginImageContext(imgsize);
[self.imageSource.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage* grabbedImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
CVReturn cvErr = kCVReturnSuccess;
CGImageRef image = (CGImageRef) [grabbedImage CGImage];
NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithBool:YES], kCVPixelBufferCGImageCompatibilityKey,
[NSNumber numberWithBool:YES], kCVPixelBufferCGBitmapContextCompatibilityKey,
nil];
CVPixelBufferRef pxbuffer = NULL;
CVReturn status = CVPixelBufferCreate(kCFAllocatorDefault, imgsize.width,
imgsize.height, kCVPixelFormatType_32ARGB, (__bridge CFDictionaryRef) options,
&pxbuffer);
NSParameterAssert(status == kCVReturnSuccess && pxbuffer != NULL);
CVPixelBufferLockBaseAddress(pxbuffer, 0);
void *pxdata = CVPixelBufferGetBaseAddress(pxbuffer);
NSParameterAssert(pxdata != NULL);
CGColorSpaceRef rgbColorSpace = CGColorSpaceCreateDeviceRGB();
CGContextRef context = CGBitmapContextCreate(pxdata, imgsize.width,
imgsize.height, 8, 4*imgsize.width, rgbColorSpace,
kCGImageAlphaNoneSkipFirst);
NSParameterAssert(context);
CGContextConcatCTM(context, CGAffineTransformMakeRotation(0));
CGContextDrawImage(context, CGRectMake(0, 0, CGImageGetWidth(image),
CGImageGetHeight(image)), image);
CGColorSpaceRelease(rgbColorSpace);
CGContextRelease(context);
CVPixelBufferUnlockBaseAddress(pxbuffer, 0);
appended = [pxlBufAdaptor appendPixelBuffer:pxbuffer withPresentationTime:presentationTime];
CVBufferRelease(pxbuffer);
}
的问题是,所得到的视频包含损坏图像 - 所有像素都被抵消。它看起来像内存填充字节与一些偏移量和该偏移损坏了演示文稿。
这怎么解决? 我想要任何胶水或方向。 在此先感谢。
好吧,帮助 – Tony
好吧,我试着用[self.imageSource.layer renderInContext:context]。但是,有问题 - 图像颠倒了。 – Tony