Make an UIImage from a CMSampleBuffer

Question

This is not the same as the countless questions about converting a CMSampleBuffer to a UIImage. I'm simply wondering why I can't convert it like this:

CVPixelBufferRef pixelBuffer = (CVPixelBufferRef)CMSampleBufferGetImageBuffer(sampleBuffer);
CIImage * imageFromCoreImageLibrary = [CIImage imageWithCVPixelBuffer: pixelBuffer];
UIImage * imageForUI = [UIImage imageWithCIImage: imageFromCoreImageLibrary];

It seems a lot simpler because it works for YCbCr color spaces, as well as RGBA and others. Is there something wrong with that code?

Answer 1

For JPEG images:

Swift 4:

let buff: CMSampleBuffer ...            // Have you have CMSampleBuffer 
if let imageData = AVCapturePhotoOutput.jpegPhotoDataRepresentation(forJPEGSampleBuffer: buff, previewPhotoSampleBuffer: nil) {
    let image = UIImage(data: imageData) //  Here you have UIImage
}