Video 'skips' during 'on screen display'

[Shader]

First of all... I'm from The Netherlands ergo my english isn't that good :-)

I've got a small problem...

Everytime the on screen display appears the video playback of live television and videoplayback stutters.
I've tried all possible settings (overlay/WM9/etc) but I can't seem to solve the problem.

Is there anyone out there who can help me ?

My hardware setup:
Hauppage PVR150
Radeon 9250 with tv out
P IV 1.8 ghz
512 MB ddr
7200 rpm HD with 8 mb cache

Software:
GBPVR using overlay

[Darx-starz]

Try different codecs. Also try encoder pass thru in the config app.