Encode into H264 on Windows (Has anyone been able to do this?)

[William Metcalf]

I need to encode video into H264 format for a project I am working on.  
So far, no matter what I do I cannot get my video encode into H264 
format.  I am trying to use the element h264enc to accomplish this 
task.  The following pipeline:

- gst-launch -v videotestsrc num-buffers=1000 ! x264enc qp-min=18 ! 
avimux ! filesink location=videotestsrc.avi

will work in Linux but will not work in Windows.  Has anyone out there 
been able to get the x264enc element to work in Windows?  Is there some 
extra library that I need to install to make it work correctly?  Any 
help is greatly appreciated.

William