I would like to get the Flash fallback for mediaelement.js to work, but it only shows a black area saying "download file" in the upper left. The video markup I generate looks very much like this. I just modified some paths for privacy reasons:

<video width="1024" height="576" preload="none" style="display: none; ">
  <object width="1024" height="576" type="application/x-shockwave-flash" data="flashmediaelement.swf">
    <param name="movie" value="/wp-content/themes/my_theme/js/vendor/mediaelement/flashmediaelement.swf">
    <param name="flashvars" value="controls=true&amp;file=http://mybucket.s3.amazonaws.com/my_video.mp4">
   </object>
</video>

Is there anything obviously wrong with this? Is there a way to get some debug output? When does the "download file" thing show up? The mediaelement.js page doesn't mention it anywhere. I first thought one of the paths must be wrong, but I can't see any failed requests in Chrome's debug tools.

Any help is appreciated!

EDIT: I extracted a minimal example of the failing code and uploaded it here

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