This happened when I was watching the last UPF and Skylanders swap force. The video will spazz out for a second. I don't think this is a problem with the video rendering because I rewound back and it didn't happen again at the same spot. I am using HTML 5 on Google Chrome. It doesn't seem to happen with progressive.
I previously have had 0 issue with the HTML5 streaming but now I am having a similar issue to Flacracker. If I use progressive or streaming I am fine but for some reason HTML5 hitches. Same as Fla I'm using chrome. Up until now I've not had any issues with the player so it seemed out of place.