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Old 30-05-2017, 07:51
shazzla shazzla is offline
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Lzham - stdin/stdout

Hi guys !

Today i realized ,7-Zip can be upgrading with plugins and....
I found LZHAM plugin for it !

http://richg42.blogspot.hu/2015/11/l...for-7-zip.html

Well ,we can use 7z's LZMA2 in Freearc with this command :

packcmd = 7z a -txz -an -mcrc=0 -m1=lzma2:d1024m:fb=273:mf=bt4:mc=10000:lc=4:lp=0 -mmt=1 -mx9 -si -so <stdin> <stdout>
unpackcmd = 7z x -txz -an -y -si -so <stdin> <stdout>

But not LZHAM !
I tried many-many ways ,but doesnt work.
Maybe a smart man can figure it out....
I would be grateful for it !
Thank you !
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Old 30-05-2017, 09:29
Bulat Bulat is offline
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may it's because lzham isn't supprted by xz format?

anyway, the home of this project now is https://github.com/mcmilk/7-Zip-zstd

and there you can ask (by creating Issue) author how to use lzham in stream mode, may be with other utility

also, as author of freearc, i want to ask you - is lzham really has its edge? i thought that it's barely faster than lzma while providing much less compression ratio. how frequently it's used in repacks?
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Old 30-05-2017, 09:34
Gupta Gupta is offline
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Quote:
also, as author of freearc, i want to ask you - is lzham really has its edge? i thought that it's barely faster than lzma while providing much less compression ratio. how frequently it's used in repacks?
i would say same for lzturbo
using lzma with 4x4 beats all $Hi!, I Mean ratio trade offs are neglible in context of speed gains
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Last edited by Gupta; 30-05-2017 at 09:37.
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Old 30-05-2017, 10:03
shazzla shazzla is offline
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@Bulat :
im just a n00b.
In my test its nearly 2x faster than LZMA2 1GB.
BTW thank you very much !
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Old 04-06-2017, 12:33
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panker1992 panker1992 is offline
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lzham is an API that is unoversal, XBOX Windows Mac etc.

it was never meant to be a compressor like lzma, zstd, lz4.

it was created for 1 time compression only and only decomp speed matters as a gaming container if you like that expression
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My projects : Masked Compression, lzma2(xz) on Freearc, Zstd compressor for windows
My optimizations : packjpg.exe, zstd, lzham, precomp-dev-0.45.
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Old 04-06-2017, 12:36
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lzham is an API that is unoversal, XBOX Windows Mac etc.

it was never meant to be a compressor like lzma, zstd, lz4.

it was created for 1 time compression only and only decomp speed matters as a gaming container if you like that expression
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My projects : Masked Compression, lzma2(xz) on Freearc, Zstd compressor for windows
My optimizations : packjpg.exe, zstd, lzham, precomp-dev-0.45.
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