Issues converting video to mp4 format for use in IE9

adaru used Ask the Experts™
I am trying to convert an mov video to mp4 for use in serving up video via html5 in IE9.

-- I exported it to ogv and webm.  These formats work as expected in various browsers (Firefox/Chrome)

-- I exported the same video to mp4 using Handbrake and Miro Video Converter (tried both).  The resulting mp4 plays fine using windows media player, but it does NOT play in Chrome or IE9 when I use (a) html5 or (b) if I just drag and drop the mp4 video into these browsers).  For testing purposes I downloaded an mp4 video from the internet and it plays just fine in chrome and ie9 using both of these methods (a and b).

What am I doing incorrectly?  THANK YOU!
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Maybe this will work. It's capture software but maybe it will convert if you play. Anyway it's free

Please give these two programs a try:

Any video converter: 


they both convert videos very well.
Maybe this will help -

<video width="320" height="240" controls>
  <source src="pr6.mp4"  type='video/mp4; codecs="avc1.42E01E, mp4a.40.2"'>
  <source src="pr6.webm" type='video/webm; codecs="vp8, vorbis"'>
  <source src="pr6.ogv"  type='video/ogg; codecs="theora, vorbis"'>


I downloaded the free version of this and converted using mp4 / h.264 -- and the resulting mp4 file was compatible with Chrome and IE9.  

I'm not sure if Handbrake and Miro Video Converter have this functionality and I was not using correctly -- but regardless, this solution worked.

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