Part 1. Top Video Metadata Editors Recommended
MetaX is a Window Meta tagger. It supports to import the tag info from Amazon.com, TVDB, IMDB, iTunes for MP4, M4V, WMV, AVI and MOV files automatically or you can type the info manually. MetaX has lots of settings that allow you to use it in the way you like. For Mac, the MetaX is discontinued, but you can use an updated version called MetaZ. The disadvantage is that it is not free.
VLC Media Player
VLC is usually known as a powerful tool for media files. Besides for playing media, it can edit tags in both audio and video files. It supports Windows/Mac/Linux.
1. Open your audio or video on VLC player. Here I will open an M4V file.
2. You can click the menu "Tools" > "Media Information", a pop-up "Current Media Information" window will be opened.
3. You can edit the title, artist, album, genre, publisher, copyright, data, language and so on.
4. At last, click "Save Metadata" to save all the metadata info you have modified.
Windows Media Player
WMP is the best tool for managing your media files on Windows 10. Generally it can sort all the files by artists, albums and so on. Correct tagging info will be helpful to keep the entire library organized. To change the metadata info, you just need to right click on the media and choose "Find Metadata Info". On the popup window, you can choose to search the info online or type it manually.
iTunes provides seamless experience for users to buy, download, convert and enjoy media files. It is also a great MP4 metadata editor which is indispensable for Mac users for Apple fans with Windows computers. You can import your M4V file to iTunes library. Then you can right click on it and choose "Video Info" to edit M4V video metadata under the tags "Details", "Artwork", "Description", "Options", "Sorting" and "File".