Let your mkv files convert to VOB
Tutorial:How to convert mkv files to vob?
Just free download mkv to vob converter, and try!!!
Screenshot:

Step-by-Step Guide:
1.Free download mkv to vob converter, then you can get the above friendly interface
2.Add files by click
button to add your mkv files, batch conversion supported here
3.In the profile option, choose your output files, and in the destination, choose your output folder to save your output vob files so that you can find them easily.
4.Click
button to set video brightness, contrast, saturation, etc.
5.Click
button to cut your movie by set the start time and end time.
6.Click
button to remove the black edges.
7.Press
button to start mkv to vob conversion work.
8.After successfully conversion work, then you can enjoy your output vob files on various supported players.