how to used this method ???

msrep+a7a+exe2:d128m:fb128:mc1000

can anybody explain to me how the substitution works on arc.ini (to create more complex methods) the readme included with freearc is very confusing (it was automatically translated from russian.
For example:
what 5ccm2 means?
thanks
pd:i know i'm not sharing a method, but i cant find a more proper thread with the method substitution meaning.

I generally use precomp040+srep+delta+exe2+lzma. It depends on various games.

Depends on the game I am compressing, really.

A Game that has Zlib streams will compress far better with Pzlib+Srep64+xz.

I am not a fan of using Delta+exe2 because quite frankly I have seen it yield poor results compared to using straight up srep64+xz.

There aren't any general method that'll work with every game. Each game is different unless it's built on the same engine (Like Source Engine, Unreal Engine, etc.)

Unreal Engine games usually compress to 38%~50% in average for me.

I get great results with Pzlib+msc+srep64+xz when used with Resident Evil 0 HD Remaster, for example.

That's actually a mask that you've included in your code. Masks are useful if you are compressing the game in one huge bundle. The arc.groups file classifies certain files formats and will compress them in the method described in the arc.ini to achieve best possible compression.

For example, jpg files are referred to as $solid. MSR aka Precomp43 will be used to compress those, if found.

$void are files that're already compressed to the max, like videos. If .bik files are found among what you're compressing, it'll use Srep64 to compress them, as these files can't be compressed further. (though in my experience, srep64+xz helps to reduce the size a tad more)

$text is declaring the method that'll be used to compress text files.

;Timick Methods - lzma:a1:mfbt3:d400m:fb32:mc1000000:lc8
;FitGirl Methods - lzma:ultra:512m:a2:mfbt4:fb1024:mc10000:lc8:lp4:pb 4
;Fenixx Methods - lzma:177mb:normal:bt4:128:mc10000:lc8
;Best Methods - lzma:200mb:normal:bt4:128:mc100000:lc8

this line means:
- compress group $text with dict:p+lzp+ppmd:10:512mb
- compress group $wav with tta
- ....
- compress remaining files with ccm2

groups are defined in arc.groups file. i.e.

$exe
*.exe
*.dll
$text
*.txt
$binary
*.x
*.y
$default
*.z

means that exe/dll files will be placed in group $exe, txt files into $text, x/y/z and all unspecified files (denoted by $default) - in group $binary

arc.groups also establishes file sorting order for compression

hmm... let me share some simple my method used from Mini Compressor. :D