I managed to resolve the minor stutter I had on all channels by changing the refresh rate of the gfx card to 50hz. My TV only supports 1360 x 768 @ 60hz which is a real shame. I have to go to 720p or 1080p before I have a choice of 50 or 60hz. I decided on 720p as I couldn't notice any difference at 1080p and the text is too small to read at 1080p when using Windows.
Now it is playing as smooth as, except for my original problem with the TVNZ SD channels, namely TVNZ 6 & 7 and Sports Extra (when operating). What happens is everything is fine for a minute or 2 and suddenly it goes crazy with very bad stutter for 5 to 30 seconds, and comes right again. I thought I had resolved it by installing the latest Catalyst drivers, but I was mistaken.
Someone suggested this was due to the ATI 780G / HD3200 card or drivers not handling interlaced video properly. The problem with this theory is that all the other 576i SD channels have no problems at all - C4, Maori TV, Parliament TV, TV Central. TV3 has no problems at all, nor the other HD channels.
Signal strength on all 3 UHF channels are excellent.
Recording TVNZ 7 while watching the stutter, plays back perfectly with no stutter.
Can this really be a gfx card/driver issue?
Can anyone recommend any settings to tweak in the Bios, Windows, or anywhere?
Antec Veris Fusion v2 Case, Gigabyte MA78GM-S2H w/ 1080p HDMI, AMD Phenom™ X3 Triple-Core 2.1Ghz, Hauppauge WinTV HVR-2200, WD Caviar 750 Green, Asustek BC-1205PT Blu-ray, Logitech Harmony 525 remote, Windows Vista, Media Portal RC2.