Christoph - thank you for the pointer. I have reported it as you suggest: https://github.com/quodlibet/mutagen/issues/391
** Bug watch added: github.com/quodlibet/mutagen/issues #391 https://github.com/quodlibet/mutagen/issues/391 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1835771 Title: MP4 fails with string argument for freeform text ('----') tags To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mutagen/+bug/1835771/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs