Alpha图像转换为.mov

Question

我已经能够通过跟踪堆栈上的各种tutorials来创建播放.mov。

但是，我的图片包含alpha。

CGColorSpaceRef rgbColorSpace = CGColorSpaceCreateDeviceRGB();
CGBitmapInfo bitmapInfo = (CGBitmapInfo) kCGImageAlphaNoneSkipLast;
CGContextRef context = CGBitmapContextCreate(pxdata, size.width,
                                             size.height, 8, 4*size.width, rgbColorSpace,
                                             bitmapInfo);

这会产生

我有一种感觉，这是由于bitmapInfo，但当我使用kCGImageAlphaLast我的应用程序崩溃时

此错误

CGBitmapContextCreate：不支持的参数组合：8个整数位/组件; 32位/像素; 3组分色彩空间; kCGImageAlphaLast; 688字节/行。

我希望有一个简单的解决方案，我不确定我错过了什么。

这是我的完整pixelBufferCode

- (CVPixelBufferRef) pixelBufferFromCGImage: (CGImageRef) image {

    CGSize size = CGSizeMake(self.imageWidth, self.imageHeight);

    NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:
                             [NSNumber numberWithBool:YES], kCVPixelBufferCGImageCompatibilityKey,
                             [NSNumber numberWithBool:YES], kCVPixelBufferCGBitmapContextCompatibilityKey,
                             nil];
    CVPixelBufferRef pxbuffer = NULL;

    CVReturn status = CVPixelBufferCreate(kCFAllocatorDefault,
                                          size.width,
                                          size.height,
                                          kCVPixelFormatType_32ARGB,
                                          (__bridge CFDictionaryRef) options,
                                          &pxbuffer);
    if (status != kCVReturnSuccess){
        NSLog(@"Failed to create pixel buffer");
    }

    NSParameterAssert(status == kCVReturnSuccess && pxbuffer != NULL);


    CVPixelBufferLockBaseAddress(pxbuffer, 0);
    void *pxdata = CVPixelBufferGetBaseAddress(pxbuffer);
    NSParameterAssert(pxdata != NULL);

    CGColorSpaceRef rgbColorSpace = CGColorSpaceCreateDeviceRGB();
    CGBitmapInfo bitmapInfo = (CGBitmapInfo) kCGImageAlphaLast;
    CGContextRef context = CGBitmapContextCreate(pxdata, size.width,
                                                 size.height, 8, 4*size.width, rgbColorSpace,
                                                 bitmapInfo);
    //kCGImageAlphaNoneSkipFirst);
    NSParameterAssert(context);
    CGContextConcatCTM(context, CGAffineTransformMakeRotation(0));
    CGContextDrawImage(context, CGRectMake(0, 0, CGImageGetWidth(image),
                                           CGImageGetHeight(image)), image);
    CGColorSpaceRelease(rgbColorSpace);
    CGContextRelease(context);

    CVPixelBufferUnlockBaseAddress(pxbuffer, 0);

    return pxbuffer;
}