Sorting by filename

[TheDreadPirate]

This is a tough one.

You could try putting it back into a shows/movies/mixed library and enable NFO saver and save images with your media. That will write the metadata to files that the music video library could then read.

But you cannot have the same folder in two libraries so you would have to add it to a library that pulls TMDB metadata, then move it back to the Music Videos library once it is done writing metadata to disk.