HTML5 Player works on local system but not on server

I am using an HTML5 player and the videos work perfectly on my local machine but once I upload everything to the webserver the video will not load. No error message. Just an X

All the paths are perfect (I triple checked)

It works in Chrome and Opera but not firefox or IE :(

  <source src="http://mywebsite.com/english_short.webmvp8.webm" type='video/webm; codecs="vp8, vorbis"' />
  <source src="http://mywebsite.com/english_short.theora.ogv" type='video/ogg; codecs="theora, vorbis"' />
  <!-- Flash Fallback. Use any flash video player here. Make sure to keep the vjs-flash-fallback class. -->
  <object id="flash_fallback_1" class="vjs-flash-fallback" width="150" height="130" type="application/x-shockwave-flash"
    data="http://releases.flowplayer.org/swf/flowplayer-3.2.1.swf">
    <param name="movie" value="http://releases.flowplayer.org/swf/flowplayer-3.2.1.swf" />
    <param name="allowfullscreen" value="true" />
    <param name="flashvars" value='con开发者_如何学Pythonfig={"playlist":["http://mywebsite.com/screen.png", {"url": "http://mywebsite.com/english_short.mp4","autoPlay":false,"autoBuffering":true}]}' />
    <!-- Image Fallback. Typically the same as the poster image. -->
    <img src="oceans-clip.png" width="150" height="130" alt="Poster Image"
      title="No video playback capabilities." />

  </object>
</video>

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It's your video types. WebM and Ogv aren't supported by IE. Firefox is supposed to support WebM; but only in version 4. to target IE, you'll need to use MPEG or AVI.

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I've had issues before with versions of Firefox before 4.0 where the OGG source had to be the first one otherwise it fails. As mentioned by Thomas, FF 4 should support WEBM, but I'd suggest putting the OGG source first, followed by the WEBM.

As for IE, again as Thomas says, it supports playing MP4 through a Flash player as you have done so.

Can you link us to a test page?