Dynamic Stream not playing f4v files

In my .smil file, if I put this line it works:
<video src="sample.flv" system-bitrate="150000"/>
But if I put the following line it doesn't work:
<video src="mp4:sample1_150kbps.f4v" system-bitrate="150000"/>
Both video files are in the webroot\vod folder.
I am using the sample dynamicStream.smil code, so my syntax should be right.
Does anyone see what I am doing wrong?
Thanks

Testing. I found out that If I have one video line in my .smil file, it will play the .f4v, but two lines don't work.
This works:
<video src="mp4:sample1_150kbps.f4v" system-bitrate="150000"/>
But this doesn't work:
<video src="mp4:sample1_150kbps.f4v" system-bitrate="150000"/>
<video src="mp4:sample1_500kbps.f4v" system-bitrate="500000"/>
I am using the code snippet from the index.html page

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