Hi tormento,
Are you using latest version of gMKVExtractGUI?
I believe that mkvinfo is not being used after v1.9.0 or something like that, so it is really curious that you see mkvinfo.exe hanged.
Have you tried waiting for mkvinfo to finish?
EDIT: I think I found what is happening here... gMKVExtractGUI attempts to find the track delays, assuming the video track as an anchor.
However, there is no such need in matroska files that don't contain any video tracks. New version coming soon...
EDIT2: New version is up! I think that the issue is now fixed! Thanks for your feedback!
Download link:
https://sourceforge.net/projects/gmk....2.7z/download
Changelog- Stop trying to find delays in matroska files that don't contain any video tracks