JW Player 6.5 Error Loading Media: File could not be played in firefox

JW Player — Apr 04, 2014 08:55AM EDT

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Hi,
I recently bought JW PLAYER ADS 6.5
On local host it gives the following error 'Error Loading Media: File could not be played' in firefox and on self hosted web server it plays 2 secs and stops in firefox. Never loads in IE. only plays in google chrome
JW PLAYER 6.5 Test Link
http://www.ubraintv.com/test.php

The same video plays fine in old JW PLAYER 5.10

JW PLAYER 5.10 Link
http://www.ubraintv.com/watch.php?id=689

Please help

My code

<script type="text/javascript" src="jwplayer/jwplayer.js"></script>
<script type="text/javascript">jwplayer.key="xxxxxxx";</script>

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<div id="myElement">Loading the player...</div>

<script type="text/javascript">
jwplayer("myElement").setup({
file: "upload/videos_all/live/CherieBlairFoundation6.mp4",
image: "upload/videos_all/thumbnails/CherieBlairFoundation6.jpg"
});
</script>