7zip Ultra LZMA2 compression

Question

How can I convert this settings into command?

Here are the results:

// Manual Compression (see the image above)
Compressed Size: 12,647,451 bytes

// Ultra
7z a -t7z Files.7z -mx9 -aoa
Compressed Size: 12,676,886 bytes

// LZMA2
7z a -t7z Files.7z -m9=LZMA2 -aoa
Compressed Size: 14,237,515 bytes  

I am looking here:
http://sevenzip.sourceforge.jp/chm/cmdline/switches/method.htm

I am about to put this in a batch file.

Answer 1

Your command line should be at least:

7z a -t7z Files.7z -m0=lzma2 -mx=9 -aoa

Note that you'll get better compression when using 1 or 2 threads, not 8. So, even closer to your GUI settings (ms : solid, d : dictionary size, mhe : encrypt header (file names), p : password)

7z a -t7z -m0=lzma2 -mx=9 -aoa -mfb=64 -md=32m -ms=on -d=1024m -mhe -pSECRET

Answer 2

It's hard to get the same result, but this is the best I can get so far:

7z a -t7z Files.7z -m0=BCJ2 -m1=LZMA2:d=1024m -aoa

Answer 3

For those who are on unix system, this is how I achieved this.

7z a -t7z -m0=lzma2 -mx=9 -mfb=64 -md=1024m -ms=on destination.7z Source

My source: http://manpages.ubuntu.com/manpages/artful/man1/7z.1.html

Answer 4

This command is creating for me the same output like the ultra configuration with the ui. I have found it in the documentation under examples. 560MB to 29MB (binary data with a lot duplicate files)

7za.exe a output.7z ./input -mx

Answer 5

I think you are looking for a tool like this:

https://axelstudios.github.io/7z/#!/

In this online tool, you set your settings and then you get correspondent command line options and parameters.