I recently installed MythTV on my computer and for the most part it works perfectly. However, when I try to watch Live TV, the audio is distorted and has a high-pitched squeal over it. The video has many horizontal black lines. I run tvtime and have neither of these problems. However, the audio for tvtime runs through the CD input while mythtv uses it running through the Capture input. Any help would be greatly appreciated. Thanks!

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Kubuntu Breezy 5.10
AMD Athlon XP 2500+
640MB RAM
nVidia 5500 256MB RAM
ATI TV Wonder VE
1 Seagate Barracuda 160GB HD
1 Western Digital 120GB HD