I know this is not a necessary place, but does anybody know how to tag music videos for Itunes (tagging goes beyond Itunes possibilities, something like an "E" tag (itunesadvosiry) for a song, but for a music video, and maybe it could be shared (itunescatalogid))?
You need to create the tag called “iTunes Kind” and set it to be “Music Video” in the metadata. The other tags can be “Normal” for music files, and there are others for Movies, TV Shows, etc.
Did you have a look at the list of supported tag fields?
I found ITUNESMEDIATYPE: