I'm not really sure how it's going to work in Chrome, though. The article says they are going to support both codecs. As a result it's up to browser which video source to choose. It's interesting whether it will pick the first source or the 'preferred' one (presumably, mp4). Is it possible to set the source preference in HTML? Like:

  <video>
      <source src="example-video.mp4" type="video/mp4" />
      <source src="example-video.ogv" type="video/ogg" default/>
  </video>

or something similar?