Y16 Encode/Decode support

I'm trying to encode / decode 16 bit grayscale video. I assume the right FOURCC for this is MFX_FOURCC_R16. Is that correct?

Assuming it is, the library throws an UNSUPPORTED error when calling MFXVideoENCODE_Query. The trace log is attached. I notice that the FOURCC in the FrameInfo is printed as UNKNOWN. Does that mean that R16 is not supported? What am I doing wrong?

Thanks,
-J