I'm kind of going crazy with this issue (and I don't even know how big of an issue it really is) and feel like I've tried everything to no avail. First, here's the specs for my setup in order of the signal path:
HTPC - Windows 7 Ultimate 64 bit (Aero enabled) with Intel 4670K Processor, NVidia GTX 770 Graphics card, 16 GB RAM, Samsung Evo 840 SSD
Denon AVR-2113ci Receiver
Darbee Darblet signal processor
Epson 5020ub Projector
Installed on the HTPC is XBMC Frodo with up to date video drivers etc. I'm using it in full screen mode. Now for the issue that's really bugging me... When XBMC (or even VLC for that matter) starts video playback with hardware rendering, the screen flashes blank for about 3-4 seconds before the video appears on the screen. The sound plays during that time, but nothing shows up on the screen. If I disable hardware rendering, and force XBMC to use software, the video plays immediately. Another setting that I've seen do this, is if XBMC is set to change refresh rate to match video. Like I said, I've seen the same issue when I'm not in XBMC and open a video in VLC. The entire screen will blank for a few seconds, and then the windowed VLC will re-appear with the video playing. When the video stops playing, there is another 3-4 second blank screen before the menu re-appears.
This wouldn't bother me as much if it wasn't for the fact that it causes my introduction videos (using the Cinema Experience pluggin) to miss the first whole chunk of the video. In short videos, 3 seconds is a lot to miss. I just went to Windows from Linux and never had this issue with XBMC on Ubuntu using my old ATI video card with hardware rendering. This leads me to believe it's something on the computer and not just the fact that the projector takes a while to adjust to the new refresh rate.
I'm pulling my hair out trying to resolve this. I realize that I could just leave DXVA rendering off and use the processor to render video at the native 60 FPS but have heard that this causes issues with how smooth the video is. After spending a lot of time and money getting this set up, I'd hate to feel like I was sacrificing playback quality.
Any advice would be greatly appreciated!