I was checking out my site ToddBrannan.com with my iPhone 4s and noticed that my videos were not able to be played. So I surfed over to some other sites and the same thing happened. My videos are embedded using HTML5. So that wasn’t the problem.
I found the problem to be with my iPhone. to fix this problem you need to do the following:
Go to settings->safari->Clear cookies and data, it will fix the problem. Or so it has for me.
If there is another solution I would love to hear it in the comments.