Video can't be played on my i-pod

Hi:

I have a I-pod classic (80GB) and I bought Cool for the Summer video. When I try too copy it to my I-pod, it says: Cool for the summer was not copied to your I-pod because it can't be played on your I-pod. I can copy my Falling Skies Episodes (season 5) and I have Bad Blood music video in it. Why I can't copy the video?

I-pod has the latest update. Can somebody help?