Comment 2 for bug 264865

I ran into this exact problem today and I've been banging my head against the wall trying to figure out what was causing it. The video I tried playing works fine under windows, played in VLC. However, I got the same artifact problem in both totem and VLC. The artifacts appear to consist of a pink overlay that disappears block-wise where motion updates occur and what looks like blocks of randomly colored pixels that fade in slowly until the next keyframe. It is very noticeable and extremely annoying.