FYI - I've added the nVidia PureVideo Decoder and am now very pleased with the quality of the playback for both DVD's and in particular MPG file handling. MPG Playback is now smooth with little tearing, interlace issues are gone, plays all file types (including Muxed MPG/DTS files), and the Aspect Ratio is now always correct (no manual switching). The following is the filter selection that works for me:
* Nero File Source (Async)
* Nero Splitter
* NVIDIA Video Driver
It then auto selects, "FFDSHOW Audio" decoder and "Video Mixer"
I still get some frame rate shudder but I think that has something to do with the video card settings (will play more later)
Thanks
Nathan