We have a lot of quicktime functions to read metadata values in our plugins.
I had a look on your site but I couldn't find what I was looking for. If you tell me that you have a plugin that will allow me to do the following, I will simply buy your complete plugin collection.
Specifically, let's say I have a movie in iTunes, properly tagged with cover art and a summary with release date etc. Now let's say I drag that movie manually out of iTunes onto the desktop. I want my app to examine the movie file and display the metadata - can your plugin read all the metadata successfully? Note that I don't want to write to the movie file (although that would be a bonus), I simply want to read from it.