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我想抓住UIView,轉換爲圖像,並將該圖像存儲在視頻文件(.mp4)中。 我使用哪個抓住圖像並將其用於像素緩衝器的代碼的下部分:IOS 5:UIView轉換爲視頻並導致視頻損壞
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);
}
的問題是,所得到的視頻包含損壞圖像 - 所有像素都被抵消。它看起來像內存填充字節與一些偏移量和該偏移損壞了演示文稿。
這怎麼解決? 我想要任何膠水或方向。 在此先感謝。
好吧,幫助 – Tony
好吧,我試着用[self.imageSource.layer renderInContext:context]。但是,有問題 - 圖像顛倒了。 – Tony