WIC Metadata

[superware]

Hello @amerkoleci, great job on Vortice.

Regarding WIC metadata, no matter what I try an encoded JPEG never contains any EXIF or XMP metadata:

using (var factory = new IWICImagingFactory())
using (var encoder = factory.CreateEncoder(ContainerFormat.Jpeg))
using (var stream = new FileStream(filePath, FileMode.Create))
{
	encoder.Initialize(stream, BitmapEncoderCacheOption.NoCache);

	using (var frame = encoder.CreateNewFrame(out var props))
	{
		frame.Initialize(props);
		frame.SetSize(width, height);
		...
		frame.SetPixelFormat(ref pixelFormat);
		frame.WriteSource(converter);
		...
		props.Set("ImageQuality", quality);

		using (var writer = frame.MetadataQueryWriter)
		{
			writer.SetMetadataByName("/app1/ifd/{ushort=271}", new() { Value = "Custom Camera" });
			writer.SetMetadataByName("/app1/ifd/{ushort=40091}", new() { Value = "My Title" });
			metadata.SetMetadataByName("/xmp/dc:title", new() { Value = "My Image Title" });

			frame.Commit();
			encoder.Commit();
		}
	}
}

SetMetadataByName doesn't fail for those names (a non-existing name does fail), is this the right way to pass Variants? Maybe it fails silently since the marshalled variant is unexpected or invalid?

Since no metadata encoded, am I missing anything?

Thank you in advance.