Hi Sylvia and thank you for reply.
I have sound that not the real problem.
if you check here : http://forum.xbmc.org/showthread.php?tid=146911
at section 1 they say :
"To support HD Audio (TrueHD & DTS-HD MA) on Windows the Intel Management Engine Interface driver must be installed, it's this driver that provides the HDCP DRM necessary for the HD Audio formats to works. If this driver is not installed then the HD formats will be missing from the Supported Formats tab. In order to verify you have the Intel Management Engine Interface driver installed, follow the relevant step atBlu-Ray* Disc Playback with Intel HD Graphics FAQ"
but everything is ok on my configuration.
at section 3, the problem it's the NUC give me a Max Number of Channels of 2 instead of 8.
So the NUC can play stero, Dolby Digital, DTS and Dolby Digital Plus on my AVR, that works (after 2 days of working with intel drivers). But can't play DTS-MA and Dolby Digital TrueHD
I have the lastest video/audio drivers.
I have the lastest BIOS
My AVR is 1.4 HDMI 3D
My cables are 1.4 HDMI
With my ATI 5450 that works fine. it's just a driver problem, not a hardware problem...
I read on internet that NVIDIA and ATI drivers support the EDID override and that's the solution for a lot of people here that have problems with Video / audio over AVR. If intel add to the drivers the possibility to do EDID override, I can force the number of channel to 8 and everythink will works fine ! so please, be professionnal and add this feature to your drivers and you will have a lot of NUC return just because you don't want to add this to your drivers...
provo44 : the AVR must be between the NUC and the TV because if I connect the NUC to my TV, I will never have my HD sound...