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batman00.jpg) some players will use that as the cover art. Sometimes if you create a jpg with the same name as the title (e.g. My (rather old) media streamer does the same. For example, if you put each title in its own folder, then drop a file called folder.jpg in the folder, Windows 10 (& IIRC 7 & 8) will use that as an image when you browse the folder list. Some OS's/players will use the presence of jpg files as cover arts. A tool such as "MkvToolnix GUI" can perform the attachments (and let you twiddle lots of other settings also.) Whether your media player use that attachment is another matter. jpg image to the file to form the cover art. The MKV file format has a facility to "attach". There's a few ways to do to cover art & movie wall type things it depends on the media player(s) you are using as to how they work. and you have to rename them yourself (which does no harm to the files.) Very occasionally I've see MakeMKV deduce the discs titles so you get (for example, batman00, batman01, batman02 etc.) but the vast majority of the time it's title00, title01, etc.
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