It depends on the HDMI interface built into the HTPC, but more and more do support bitstreaming. You'll also need player software which knows how to put the bitstream out there. Most current versions of BD software can do this when playing actual BDs, but getting lossless audio out of repacked (MKV) files isn't all that well supported.


Pioneer PDP-5020FD, Marantz SR6011
Axiom M5HP, VP160HP, QS8
Sony PS4, surround backs
-Chris