Both intel HD and ATI HD 5570. I had been using the HD 5570 without problems for about 16 months and then maybe last 2 months I started losing the HD audio. Could usually toggle and get it back - sometimes I wouldn't lose it but it would just be like an occasional crackle. It kept getting worse - I originally thought it was a network issue on WHS original version, but last couple of days I have tried playing on local drive as well as the disc itself and still having the same problem. I then did a clean install of win 7 ultimate x64 with just minimal drivers and with the 5570 still had the problem so then I uninstalled 5570, cleaned all ATI drivers and installed intel drivers. With intel TMT5 will play for aprox. 20 minutes and then it loses audio and crashes/locks up the computer to the point that it will go all black and then back to the desktop, but never able to get it to come back so reboot. With TMT3 intel will just start playing HD audio and then within a minute it just starts crackling and lights on Denon start blinking. I have switch HDMI cables without any changes. I own PDVD10 but it isn't loaded, and have not tried MPC-HC yet. I will test later today with PDVD and MPC-HC but I am not hopeful at this point.
Could you point me to a guide for bitstreaming setup of MPC-HC please?