When watching a MKV file from the web in VLC, the title bar (see "#1" in image below) seems to be pulled from metadata, not the filename.
If you open the “Get Info” panel in VLC, you can change the title (“#2”) and then click “Save Metadata” (“#3”), but when the file is re-opened, the old information is shown.
I have not found any other Mac apps which can edit MKV metadata. Several offer to edit mp4 metadata, but that isn’t what I need.
Best Answer
I have found a way to do this using
mkvpropedit
which is part of mkvtoolnix.There is a GUI wrapper for this app and other Mac installation instructions available at the official website.