Blocky Picture - Codec Problem? Only In Mediaportal! (1 Viewer)

[EViS]

TV-Server Version: SVN 15867
MediaPortal Version: RC2 SVN 15867
MediaPortal Skin: Blue Wide
Windows Version: Windows XP SP2
CPU Type: Intel Core 2 Duo e6600
HDD: 1.2TB
Memory: 2GB
Motherboard: Asus P5B
Video Card: ATI X1900XT
Sound Card: M-Audio Rev. 5.1
Sound Card AC3: Coax Out

Any standard definition video played in MediaPortal (Cable TV AND DVD Movies) gives me a very blocky picture. By this I mean poor blacks/shadows (pink/blue blotches) and video looks overly pixelated. I do not receive any of these 'picture artifacts' when playing the same video (eg. DVD) in Cyberlink PowerDVD or VLC...

I have tried a variety of codecs in Mediaportal (Nero, Cyberlink, ffdshow) & none seem to make a single difference... Anyone else have such problems/possible causes or ideally a way to get the picture looking how it should (ie. It does in Power DVD & VLC)?

 

[Cage]

I have a similar problem when playing DVD-files using the internal player. The image is very blocky and also poor blacks/Shadows. Also parts of the image are misaligned when showing pans.
Non of these problems occur when using PowerDVD as an External Player.

If have Media Portal setup to use PowerDVD's Codecs for both audio and video.

When I turn PowerDVD Hardwardware acceleration off in MediaPortal the pixalation (blockyness) is gone but the image does not look as sharp as with powerDVD, the other problems mentioned are still there.

I use the latest RC2 release of MediPortal on Windows XP
Only PowerDVD Codecs are Installed.
VideoCard: Asus Geforce 8600GT
Pocessor: Intel Core 2 Duo e6700

Anyone any Ideas?