www.makemkv.com

It has been 1.5 months now, can we at least get a statement on the status?

It wreaks havoc for me when inserting a disc, as there is some mechanism that starts makemkvcon in the background when a new disc is inserted or a new drive is mounted to seek for BDMV structures, see here: https://aur.archlinux.org/packages/makemkv#comment-850099

It forcefully unmounts/breaks my ...

I think I found the culprit.

First, I used the 'disc:' source wrong and 2nd, the backup command needs a '--decrypt' flag which I found in http://www.makemkv.com/developers/usage.txt
$ makemkvcon --decrypt backup disc:0 FIGHT_CLUB

This segfaulted once too after it downloaded some "latest HK ...

Trying to get a backup of my Fight Club Blu-Ray.
As far as I understood the backup functionality is supposed to work like the dvdbackup tool for DVDs, presreving directory structure with decrypted files.

Anyway, this segfaults for me on Linux:

$ makemkvcon backup disc:/dev/sr0 FIGHT_CLUB
MakeMKV ...