[Anomen]

Try https://forum.team-mediaportal.com/threa...en.118273/ it does have an option to set UND to another language

Thank you!!! I'll give it a try for my .mkv files and let you know the results.
So far I've managed to batch a script for using mp4box for all my .mp4 files.
It re-writes the header for the language field and EMM just needs to scrape a single field.