I try to tag a video file ripped from a fresh dvd, all is ok.
Discogs recognize it (Music DVD) BUT i see the info tag only in Foobar, not in MPC-HC.
I think MPC-HC doen't recognize the tag format.
I don't try in KODI.
Since now to tag a mkv video, i extract the chapter information with mkvectreact in OGM or XML format, inquire the information tag and reinject iin the MKV with kmvmerge.
Hope this help you in the future.