https://www.facebook.com/ElmediaPlayer/posts/how-to-play-mkv-files-on-macmkv-matroska-video-is-a-powerful-container-format-kn/1098226665707058/

Elmedia is a fully-featured video player for Mac with Native Apple Silicon and Intel support. It will play any media file without a hitch. Supports a vast number of formats.