www.makemkv.com

My command line (using 1.7.0 on Ububtu 11.04):

time makemkvcon --decrypt '--messages=.MakeMKV/Harry Potter - 1 - Sorcerer's Stone.log' --debug=-same --noscan --cache=2048 -r backup disc:0 "makemkv/Harry Potter - 1 - Sorcerer's Stone"

First, the --debug value is not overriding the one I have set in preferences.

Second, the --cache value actually used is 1024.

I have 16GB of RAM, so giving 2GB to makemkvcon is no sweat.

In an ideal world, though, I'd like to be able to put the messages/debug file(s) in the backup directory as well.

The value for --debug must be a physical file , MakeMKV can't write debug log to pipes. Also, 1024 is the Max cache value that MakeMKV uses - it just don't need more memory