I recently built a Windows 7 32bit Media Center HTPC. Here are the specs:
Processor: AMD Opteron 165 @ 2.4GHz
Motherboard: Asus A8N32-SLI Deluxe
Memory: 2GB DDR 400
HD: 1TB Seagate
Tuner: Hauppauge HVR-2250
Video Card: BFG 7800GTX
Sound: Realtek HD onboard
The TV is a Samsung 46" 1080p LCD
I can't remember the model of the sound system at the moment. It is a Samsung, but I don't believe that is important.
Anyways, This is my first attempt at an HTPC. I am only using this device for over the air ATSC broadcasts. I am using a DVI to HDMI cord to plug in to the TV's video, and an optical cable to the surround sound for audio. The TV does have a VGA port with a 3.5mm "Audio In" for PC use, but I figured that HDMI would be better to use, I would also like to keep my 5.1 sound if possible. My motherboard has both Coaxial and Optical SPDIF out, but my surround sound only has optical input.
So here's the problem. When I first start Media Center, the audio is synced fine with the video. After a while the audio starts to lag behind the video... No more than 1 second... Just enough to be annoying. If I close out of Media Center and re-open it, the audio is in sync again. The delay seems to be worse if I rewind or fast forward. The problem occurs on both Live TV and Recorded TV. I have not tried DVD as the HTPC doesn't have an optical drive. (I use my PS3 for DVDs... LOVE the upscaling).
So here's what I've tried thus far:
Update Video Drivers - Check
Update Tuner Drivers - Check
Update Motherboard BIOS - Check
When this first started happening, I plugged my headphones in to the 3.5mm jack on the HTPC and it seemed to be in sync, so only the optical was lagging. Now, however, the analog output does not seem to be working. I can't get any sound out of it no matter what I do. I have not gone so far as to reinstall Win7 though.
I really love the interface and speed of Win7 Media Center so I'd rather not switch to something like Mythbuntu.
Is there anything else I can try to get this problem resolved? It isn't a huge deal to close out of Media Center every once in a while to re-sync it but it does get annoying.
Thank you for any suggestions that you might have!