Well, if you're asking for download links, that's generally not an accepted practice around here [and is against forum rules when asking for anime].
I have this saved a while back when LantisEscudo so kindly pointed out.
Its possible to rip Wii and Gamecube disks, but you need one of about 4 specific Hitachi-made DVD drives. They're DVD-ROM only drives, though, and all are now discontinued, so it's difficult to get your hands on one.
If you can get one, a program called RawDump 2.1 can rip the ISO file for you; I'm not sure how to pull files out of the ISOs on Windows, though, I've been using a Unix-based application on my Mac to do it.
Wii and GC games' video is usually in an unusual form of MJPEG, called THP (there are also some videos in a minor variant called MTH). ffmpeg is able to handle THPs, last I checked, MTHes fail, though.
A few games use a format known as H4A, which there isn't a decoder for yet, and I think there's one or two other formats I'm forgetting.
A little expensive perhaps, but if you want high quality, that's probably yer best bet.
You could also invest in a USB Capture Device to rip the footage straight from gameplay. Something like
this perhaps.
I hope that helps!