2017-10-25
Mp3tag v2.85 — This version adds support for Matroska (MKA/MKV) and improves handling of multi-track files.
Also looks like MKV Buddy is turning into
Media-Buddy by developer and will support much more.
Also noticed that ffmpeg includes a tool called
ffprobe which can dump all the metadata.
I am going to look at these 2 again and compare to MetaX. Comments welcome. I will also update the list in my original post above.