I know the program is called MKVToolNix, but I’d like to ask about support for MP4 files—specifically, if I have an MP4 file where the tracks have names, the program doesn’t recognize them.
MKVToolNix does support MP4 files in general. You’re right that it cannot read track names from them yet, but I’m not opposed for adding support for it. Please open a feature request over on Codeberg, otherwise chances are I’ll forget about it again. Thanks.