Cannot play neither IE10 HTML5 video nor Modern UI apps video

video windows-8 modern-ui internet-explorer-10 html5

In Agreement with Velcro answer

I uninstalled the driver of my ATI Mobility Radeon HD 3670 and removed the graphic card itself (including drivers by selecting the checkbox) in the Device Manager. Then, I let Windows to install its own drivers for this card.
The graphic card label now contains WDDM v1.1. I'm pretty sure there is a causal relationship between that, Media Foundation and MPEG-4 video playing...

I disabled GPU rendering in IE (Internet Options > Advanced > Accelerated graphics > Use software rendering instead of GPU rendering) and it played html5 video succesfully.

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