I started to look for a method to change the metadata of each file in my music library. There are a lot of different filetypes like .mp4, .wma, .mp3, etc. The only thing I found was the UltraID3Lib, which is only for .mp3 files.
Is there an option to change the metadata of every different filetype
Does anybody have any idea or experience in this kind of development?
Since you found TagLib, try out TagLib# AKA (taglib-sharp). There is even a nuget package for it.