Alpha Images convert to .mov - ios

Question

I have been able to create the playing .mov, by following the various tutorials on stack.
However, my image contains alpha.
CGColorSpaceRef rgbColorSpace = CGColorSpaceCreateDeviceRGB();
CGBitmapInfo bitmapInfo = (CGBitmapInfo) kCGImageAlphaNoneSkipLast;
CGContextRef context = CGBitmapContextCreate(pxdata, size.width,
size.height, 8, 4*size.width, rgbColorSpace,
bitmapInfo);
This produces
I have a feeling, its due to the bitmapInfo, but when I use kCGImageAlphaLast my app crashes with
This error
CGBitmapContextCreate: unsupported parameter combination: 8 integer bits/component; 32 bits/pixel; 3-component color space; kCGImageAlphaLast; 688 bytes/row.
I'm hoping there is an easy solution, I'm not sure what I'm missing.
Here is my full 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;
}