Just found a weird feature in Google's chrome browser, version 5.0.375.70. It seems that if you put the ogg src before the mp4, it won't play...

      <video 
        class="video" 
        poster="http://wnas.nl/files/movie/example.jpg" 
        width="780" 
        height="470" 
        controls preload>
          
          <source 
            src="http://wnas.nl/files/movie/example.mp4" 
            type='video/mp4; codecs="avc1.42E01E, mp4a.40.2"'>
          </source>

		<source 
           src="http://wnas.nl/files/movie/example.ogv" 
           type='video/ogg; codecs="theora, vorbis"'>
          </source>
    </video>
  

So you need to pay attention to one more thing when doing video and want it to work cross-browser...

And yes, I am aware that it won't play in IE and I don't care :). What I do care about is that the second video won't play in chrome for some reason, if anyone has a clue...

But what bothers me is that the iPhone won't play the thing if it's got a poster frame... So you need to omit that if you care about the iphone. I thought that they had that fixed with the ios4 upgrade, but apperently not...