I like to make Sims music videos. However, I have this issue lately where I'll film a bunch of things. Then when I go into the saved movies and look at them, a small number of the videos will have weird lines/corruption spots on them that blink on and off during the video. So then what I've filmed is unusable. I have no idea what's causing this considering it only happens "some of the time". Has anyone ever had this issue? They're like little colored squares that appear every 2-3 seconds in some of my movies. Very small but so many of them they are distracting.
I was going to post an example but when I tried to upload one of the "corrupted" videos to photobucket, the weird lines and spot don't appear at all?!

So I have no idea what that means. Whether it has something to do with a quality degradation upon uploading or what makes it so you can't see them then? Is it really a playback issue rather than a filming one? They appear for me both in realplayer and windows media player.
Any information would be much appreciated.
Mel