I wrote a utility that allows batch extraction of data from MKV files. Idea came from using OGMcleaver. However OGMcleaver did not work with MkvToolNix v3, so I wrote this.
Get the files here:
my site
If the above link does not work, get the file at
videohelp.com page
Put exe file into a directory from where you want to run it. When it starts up, all the needed files will be extracted into the same directory. Read help file for further info and on how to use.