FileForums - Best Compression Methods for 'Specific' Games. Q&A

I have already checked, I have created the checksums file on my installation and verified on his installation, the files are the same and in addition he included 137MB for the soundtrack... so his repack is 1GB or so smaller than my repack.

If you are interested send me a pm for the files... so you can try too. Thanks.

KaktoR

24-09-2025 03:15

I will check this as soon as I have downloaded the game.

kj911

24-09-2025 04:13

L0v3craft: Try it use LDMF and 1(!) threads only mode from LOLZ!

example:

Code:

lolz:dt:dtb1:dtw1:dtm1:dto1:dtd1:d256m:fba4096:mc1023:tt16:mt1:ldmf1:ldc0:ldl5 /or tt8 its barely faster/

and really recommend use defeault SREP level/chunks sizes, aka l512 !

Compressible PCM audio founds or not the archives? Video files? (checking via MSC.)

Quckly testing add delta filters before others, checking compression ratio gains or not. /gain yes = delta+srep+lolz/

L0v3craft

24-09-2025 04:39

Quote:

Originally Posted by kj911 (Post 508625)

L0v3craft: Try it use LDMF and 1(!) threads only mode from LOLZ!

example:

Code:

lolz:dt:dtb1:dtw1:dtm1:dto1:dtd1:d256m:fba4096:mc1023:tt16:mt1:ldmf1:ldc0:ldl5 /or tt8 its barely faster/

I will test those lolz parameters this evening/tonight. Thanks.

Ok I need to add -l512 to my srep parameters, because I use srep 3.93 and -l is zero by default.

msc_tak works , infact it compressed from 55.7GB to 54.9GB.

But I tested srep+4x4/lzma -> 20.3GB and after adding msc_tak before srep and the final size is smaller only of 100MB.

I never tested "delta" before than srep+lolz. I can test it with 4x4/lzma like srep+delta+4x4/lzma. But again Freearc is showing that Elamigos used only srep+lolz, I don't see "delta" in his method.

kj911

24-09-2025 05:01

Use the delta algorithm at the beginning of the chain. It may improve the ratio, it may not.

Use 3.92 from SREP! (The default value of the "l/c" parameters is 512, if not defined separately.) You can play a little more with the a0/a1/a2 parameters, although it does not multiply much. (v3.93 contains decompression bug.)

Did you run MSC with only WAV=1? With the RAW=1 option, how many audio streams does it find? True, unpacking can be a little more problematic this way, but usually it works. What can be a problem if there is no error during packing, but when unpacking it does, because problematic RAW/PCM audio files can appear that run with errors.

It is interesting to note that the small test results show that with MSC there is only an extra 100MB gain at the end of the compression chain, after the initial 800MB size reduction.

In the case of LOLZ, in the case of compression on 1 thread as described above, be prepared for it to take up to ~2-3 days! It might only bring ~5%, but it might be more, since you've run it on 10 threads so far, it might even be a bigger profit.

ps: Hint, try use DLZ replacement from LZMA, from faster compression times testing than LOLZ. Use 256-512MB dictionary.

My preferred switches: -slp -d512m -lp0 -fb337 -mc8192 -cu3 -cm43

L0v3craft

24-09-2025 06:03

Quote:

Originally Posted by kj911 (Post 508627)

Use 3.92 from SREP! (The default value of the "l/c" parameters is 512, if not defined separately.) You can play a little more with the a0/a1/a2 parameters, although it does not multiply much. (v3.93 contains decompression bug.)

I can't believe it... srep 3.2 is the solution.

srep(3.93)+4x4/lzma -> 20.3GB

srep(3.2)+4x4/lzma -> 19.4GB

but in decompression srep 3.2 doesn't work for me, so I tried srep 3.93 in decompression and works.

Masquerade

24-09-2025 15:12

Don't use delta, it will only harm your ratio. Not useful since many years (if ever).

SREP 3.2 is always a good shout for especially buggy data too.

Dunnowho69

25-09-2025 08:58

i normally use srep_3.92.exe -m5f -l128 -c64 $$arcdatafile$$.tmp $$arcpackedfile$$.tmp for srep but recently have been getting a lots of error: general (de)compression error in srep. and all those were unity games. it fixes if i remove -l128 and -c64 parameters. what could be the reason here ?

FitGirl

25-09-2025 11:17

Quote:

Originally Posted by Masquerade (Post 508631)

Don't use delta, it will only harm your ratio. Not useful since many years (if ever).

SREP 3.2 is always a good shout for especially buggy data too.

Not exactly. There are data samples which give better compression with delta. They are very rare and usually are found in obscure game engines, but still.

JustFun

07-10-2025 11:03

Assassins Creed: II (Steam Version)

For .FORGE files use:

Code:

afr+srep_new:490g+lolz

For Video files use:

Code:

xtool:c1792mb:mbik+bcm

For Sound files use:

Code:

srep_new:490g+bcm

For rest of the files use:

Code:

srep_new:490g+lolz

------------------------------------------------------------------------------------------

Game size: 5.65 GB
Compressed Game Size: 2.15 GB

JustFun

08-10-2025 07:57

Assassins Creed: Revelations (Steam Version) (English Only)

For .FORGE files use:

Code:

afr+srep_new:490g+lolz

For Video files use:

Code:

xtool:c1792mb:mbik+bcm

For Sound files use:

Code:

srep_new:490g+bcm

For rest of the files use:

Code:

srep_new:490g+lolz

------------------------------------------------------------------------------------------

Game size: 5.90 GB
Compressed Game Size: 2.64 GB

st0rm

10-10-2025 01:39

Shellshock 2: Blood Trails [2009]

Code:

Game Version : 1.0



Ripped - Re-encoded Files : Nothing



Original Size : 6.0 GB



Compressed Size : 1.67 GB



Install Time : 5 Mins on HDD (Depends your system)



Method : srep:m3f+lzma2