if you are using an html5 player, mp4 is not supported on firefox, opera and perhaps another couple of browsers. You will need to have an .ogg or webm format for these browsers. That is unless your player uses a flash player as a fallback.
HTML5 is very much in it's infancy and there are loads of quirks in various browsers and operating systems. If you want to support mobile and tablet devices, your best bet is to show desktop users a flash player (using mp4) and show mobile and tablet users an HTML5 player (again using the same mp4 file).
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Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning.
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