LAV in DXVA Native mode didn't work with a lot of BDs in MediaPortal when I tested a while back. Have these issues been fixed now?
For me, lav in DXVA mode seems to work quite well with my blurays and it has very low CPU consumption, many times it is 1-2%.
When using DXVA copy back I had some click sounds using audio bitstreaming, while I didn't had them with DXVA native or with CPU mode.