MetaMovie

I have some mp4 files I wanted to tag. It was able to open a few of them, others gave an error that mpeg-4 format not supported. For the rest, it totally destroyed the files. After saving, the filesize was a bit larger, but would not longer open or play. Luckily I had a backup of my movies and was able to restore it. Waste of 3$ and a lot time!

really works well, it easily processed an entire collection, result being all files now look great in itunes and apple tv, absolutely fantastic app, well worth the money, so much quicker than editing movies one by one in iTunes!

Works great, updated meta data on various MP4 files and found covers easily for them all, worth £1.99

This supports a mostly automated workflow to match data and cover art to movies found in TMDB. Import a large list of local files and, with the “Start search on new movies automatically” preference checked, the app does most of the work of finding and matching your movies. The best part is that the process does NOT automatically commit changes to your files; instead, you have the opportunity to correct the match (e.g. if there are re-makes or other movies with the same name) or choose different cover art. For $3, I was able to fix all of my hundreds of movies in 2-3 hours.