Hey Mark
So sorry but have been crazy busy lately. I know I have the code around somewhere but I have not been able to find it yet.
I do know that I pretty much scrapped the whole way autoembed worked and rewrote it from scratch. Autoembed was written in a time where html5 video didn't exist (only flash) so it was written for object tags. Since the vast majority of all video/audio on the web is using HTML5, you can create a much cleaner way to pull the data out if you start from scratch.
Another thing to consider is oEmbed. Some sites (e.g. youtube, soundcloud, flickr, etc) have oEmbed endpoints and you can hit it and they will give you pretty much everything you wanted from the site.
A buddy of mine hosts
autoembed.com and I've told him to point to your site. Still waiting for him to do it as well :)
I'll be in touch.
-Corey