I've moved
I've long sinced moved to my new site...in case you're snooping around here...Shops closed.
So, looks like your mime type is incorrect. The mime type for the video should be set as video/mpeg rather than text/plain. This is something that needs to be done from the server where the media file is hosted. You may need to contact your hosting company for help depending on how familiar you are with changing mime types. It isn't a time consuming process though once you know where to look. It's basically one click!I wouldn't have a clue how to change the mime so I'll upload it to archive.org. Hopefully it will work now.
As soon as you get the mime type changed you will need to go into your FeedBurner account and head over to the troubleshootize tab. You'll need to scroll down until you see the "resync" link. Click the resync link and you'll be good to go.