The question refers in this section
http://www.fileforums.com/showthread.php?t=96298...Dlg Kompressor does not use the option Multimedia compression..

The -mm option natively included in the first version of FreeArc 040 using the method TrueAudio, adding filter GRZIP and MM at the command line.
I have not used for a long time, but if I remember correctly is addressed for better compression on audio files, less on video.
You might try to make a comparison between..with the same files.
HTML Code:
-msrep+mm+delta+lzma:a1:mfbt4:d192m:fb273:mc1000:lc8
&
HTML Code:
-mmsc+srep+delta+lzma:a1:mfbt4:d192m:fb273:mc1000:lc8