Embeding a Video in HTML4 vs HTML5

Question

While searching for difference between HTML4 and HTML5 I came across the point that :

HTML5 brings a whole new dimension to web world. It can embed video

Answer 1

The current HTML5 draft specification does not specify which video formats browsers should support in the video tag. User agents are free to support any video formats they feel are appropriate. In cases where decoders are not built into the browser, the format support will be dictated by the multimedia framework of the operating system.