Take a screenshot of the first frame in a WMV file?

I'm trying to write a PHP script that will take a screenshot of the first frame in a WMV file, and save it as a jpg file.  This is on a Unix machine.  Is there a command line utility on unix that can do this, and I can execute through PHP? Or perhaps a PHP package that can do this?
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I'm trying to work out how to do a similar thing, but not necessarily the first frame.

Take a look at http://ffmpeg-php.sourceforge.net/index.php, it seems to do the right kind of thing we're attempting


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