Is there an equivalent of this video tag editor that can tag AVI and MP4 on Linux?
Maybe EasyTAG - EasyTAG - Tag editor for MP3, Ogg Vorbis, FLAC, MusePack and Monkey’s Audio files, …
Available in packman: PackMan :: Package details for easytag
Reading more about it: EasyTAG will work with mp4 files but I do not think that it will work with avi. For avi a “re-encode” (copy video/audio and edit the info) has to be done (see https://bbs.archlinux.org/viewtopic.php?id=43048 )
youre best bet that i know of is to use Bangarang or VLC (media info in the menu)