2006-12-12, 02:56 PM
fiteclub Wrote:Sub
Any idea about problem above? I assume no since no replies after 38 views but hard for me to beleive no one has some suggestions.
Well, you're opening up the Pandora's Box of the HTPC world. Everybody who tries HD ends up taxing their video reproduction system to the max and tuning is NOT a deterministic proposition. What works for me may not work for you, and I've even seen cases where slight signal changes affect final video quality.
Anyway, I've seen your symptoms on my setup (nVidia 6600 GPU). As part of my HD tuning regimen, I ended up abandoning VMR altogether. I use Overlay instead. You lose some capabilities vs. VMR (smooth transparent OSD, automatic aspect ratio) but the GPU is taxed much less and the resulting video quality was significantly better in my case. Switching to Overlay, I also had to deal with the "nVidia aspect bug" but I can't remember exactly what I did to get rid of that.
SD is flawless on my system, HD is 98% great. The only content that still causes noticeable framedrops for me is SD program carried over HD channels. I've watched framedrops simply stop during live TV when the program changed to native HD. I've no explanation for that, and guess it has something to do with SD imprecision in an HD bitstream causing a lot of extra work for the GPU.
The nVidia GPU and PureVideo decoder are quirky and not well behaved, but in my experience _once you get them tuned_ the resulting video is hard to beat. Your mileage may vary.