pshanew
11
It may or may not be relevant here, but another user had a similar issue a few days ago in another thread:
The resolution in that case, as suggested by @SteveVideos, was to have a look at a thread over on the MakeMKV forums:
https://www.makemkv.com/forum/viewtopic.php?t=19234
The last two posts suggest that using MKVToolNix GUI to remux the file specifying the correct aspect ratio resolved the issue in their case.
