Thanks, and sorry. I was playing around with the code based on Microsoft and others suggestions, forgetting that folks here might respond.
Here is my code from the page at http://www.lkdn.org/test.html
<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<title>Untitled Document</title>
</head>
<body>
<video width="352" height="288" poster="webinarvideo/screenshot.gif" controls >
<source src="webinarvideo/webinarvideo3.mp4" type="video/mp4">
<source src="webinarvideo/webinarvideo2.webm" type="video/webm">
<source src="webinarvideo/webinarvideo2.ogv" type="video/ogg">
</video>
</body>
</html>
As far as what I can see, it is identical to yours but it still does not work on IE9