I am rendering video as MP4 (H.264) using Expression Encoder. I am choosing the H.264 Screen Encoding VBR profile. It produces an .mp4 file that I can play on my computer (I'm on Windows 8 RTM) using Media Player and when I put it on my site I can see the video play in Google Chrome, but it won't play in IE10. Any reason why not or how to go about troubleshooting this?