Quicktime audio lag?

Trying to get the most of my iPod, I wanted to download some videos. And I found Mystery Science Theater 3000 on Google Video. When I watch it on the internet, the sound and picture lines up perfectly, but when I download it and watch it from both my computer and iPod, the sound lags. It gets progressively worse over time, which means that about 30 minutes into the video, I can see Crow and the actors on screen speaking... wait and then the sound comes.
How the hell do I prevent this?

Jam it back in, in the dark.

Link to the videos in question, so we can take a look see.

There's nowhere I can't reach.

Like this one. It works fine while looking at it in the browser, but should I choose 'Download video' and the result is very dissappointing.

This thing is sticky, and I don't like it. I don't appreciate it.

I looked at the downloaded video, and just as you had said, there was major lag the longer you play the video. Afraid I can't help you there, as I'm having the same problem with my configuration

I am a dolphin, do you want me on your body?