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Name Comment's
Frank Wood

Location:
United States


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Check out www.deplump.com. It is a new lossless compressor with fairly good performance.
  
Moderator-Comment: Thanks for the link. It might be a good compressor, but I'm not able to test it because the demo is web-based only.
CNK

Location:
Australia


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Great job with the website, I wish I could be bothered to do something like this.

I would like to inform you of the UltimateZip compression program (www.ultimatezip.com). I got an early version of this program over five years ago (guessing) on a free CD from a magazine and I have used it ever since due to the large number of files it supports (even more now I see). I have found that PKZip can compress better in Zip format but it would still be nice to know where it would stand on the charts. The newest version is 5.0 (should look up what mine is) and there is a Command Line version too.
Bulat





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Toby, encrypted data can\'t be compressed......................................
JamesK

Location:
United States


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Could you add a column in one of the data sets to show which compression providers supports unix?

Thanks!
dayvid86

Location:
France


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Bonjour !

Je trouve le logiciel paq8px vraiment incroyable
encore mieux que WinRK

Le résulta est carrément bluffent
mais je trouve vraiment très dommage qu\'il ne supporte pas les multiple cœur
vraiment très dommage, il faut améliorer absolument ceci

Je souhaite être tenue informer de vos précieuse avancées
Merci a vous !


Hello !

I find software paq8px really incredible
Even better than WinRK

Him(it,her) resulted is downright bluff
But I find really very damage that it does not support(bear) multiple heart
Really very damage, it is necessary absolutely to improve this

I wish to have to inform of your invaluable advanced(moved)
Thank you has you!
Toby

Location:
United States


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I love the site. My eyes are opened now to the many archivers that perform better than my old standby 7zip. Well done.

Also, I\'ve been working with a lot of encrypted files recently, and was disappointed to find they don\'t compress much. Have you done any tests on encrypted files? Ordinarily, I think the best idea would be to compress first, and encrypt after, but I don\'t have that option.
Leo

Location:
Argentina


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Hello, I found your site very interesting, and I will recommend it to my friends. Thank you!
Matt Mahoney

Location:
United States


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Also, try exe_j1.cfg to compress .exe and .dll files. It implements a E8E9 filter.
  
Moderator-Comment: Will do.
tester

Location:
Russian Federation


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Here:
http://mattmahoney.net/dc/#zpaq
http://mattmahoney.net/dc/jpg_test2.zip
http://mattmahoney.net/dc/bmp_j4.zip
http://mattmahoney.net/dc/exe_j1.zip
http://mattmahoney.net/dc/bwt_j3.zip
http://mattmahoney.net/dc/bwt_slowmode1.zip
  
Moderator-Comment: Thanks, I visit that site frequently, but always missed those cfg's. Maybe Matt should add them to the zpaq 1.10 download file?.
tester

Location:
Russian Federation


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ZPAQ 1.10
A10.jpg >> jpg_test2.cfg >> 716286
rafale.bmp >> bmp_j4.cfg >> 522029
  
Moderator-Comment: Nice improvement!.
Where can I find those specific cfg files?
guest





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www.compressionratings.com is the best compression benchmark site:
- Public data sets (software,games,text,audio...)
Everybody can verify the results.
- Separate benchmarks for each set and a summary.
- Very large corpus (Not museum like).
- UNLIMITED program options suggested by the authors themselves.
- Author accepting suggestions from users and is improving the site and the corpus permanently.
- Different result views with dynamic sorting
(large listing, brief listing, pareto frontier, comparison tool,...)
- Frequently updates
  
Moderator-Comment: Well, I guess it depends what you are looking for...

The SFC testset is open and Authors are free to suggest better settings, but I'm sure I already use the best ones for the SFC set, so no need for that.

The MFC set is closed for a reason, as many authors of compression programs tune their program towards test sets. Keeping the set closed prevents this so I can more accurately present the compressors performance.

As I and others already tested long ago : size of the corpus does not really matter above a certain size. A corpus size of 300 MB or 3 GB will probably give the same overall winners in compression, efficiently etc.

BTW www.maximumcompression.com is *100% independent* and not created by a person also writing compression programs like the author of compressionratings.com. Think about that one.
pl

Location:
United Kingdom


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Hi,
why aren\'t the test files for MFC made available to the public?

Thanks for a great site though!

  
Moderator-Comment: It's explained on the MFC testpages themselfs : I also decided to make this testset 'non public', so it's harder for developers to tune their program towards this specific test. I think this is the most fair way to get 'real life' performance tests.
Fu

Location:
China


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Hi, since you are testing now. Please use the latest version of csc -- csc32a6

Here it is:
http://encode.ru/attachment.php?attachmentid=1341&d=1278337344

use: csc32a6 -m1/2/3 (-d64 by default) infile outfile
csc32a6 infile extractedfile
  
Moderator-Comment: I just finished with CSC 3.2a5, but no problem I will start again Smiley
Loderun

Location:
Finland


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But thing the temperature means?
are joking, seems me what say!
  
Moderator-Comment: No joke, it's just to hot to be behind the PC for a longer time. In my computer room it's over 34C right now. Early next week temperatures are expected to drop, so I can start testing again.

Update : Testing is progressing nicely. I expect an update in 1 or 2 days.
Runking

Location:
United States


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The test update?
in the next week-end?
  
Moderator-Comment: Oops. I will start as soon as the temperature goes down a bit here (around 32C now). 36C expected for Friday Smiley
encode





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callmeace

Location:
United Kingdom


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Thanks for the reply cyan; I have noted those Etincelle links. Sorry to read that you got hit (you mean that you got hit by a car?) and I hope you recover and get well soon.
Cyan

Location:
France


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Hi Calmeace

Sorry to discover your message so late. It\'s even a miracle i found it, as I\'m not accustomed at using maximumcompression guestbook as a place for messages.

I would invite you to send your questions or requests either to Etincelle\'s thread here :
http://phantasie.tonempire.net/pc-compression-f2/etincelle-fast-efficient-compression-x280-82mb-s-t102.htm#160
or more famous compression forum here :
http://encode.ru/threads/579-Etincelle-new-compression/page3

To answer quickly your question :
Etincelle is a just a (quick) compression algorithm.
To be fully usable, it needs to be integrated into a real full-fledged archiver, such as FreeArc, 7zip, winzip, or any other.

These programs are much more usable, and on top of being able to process multiple files in a row, they also use some \"filters\", which prepare data before being compressed. Filters for Wav files are particularly effective. So for good compression of wav files, a wav filter is required (FreeArc and Nanzip are good examples for that).

Therefore, the current plan is to open-source Etincelle, so that any archiver (or any dedicated program) can use it. This way, your request for a program which compresses multiple Wav files at high speed with good compression ratio can be achieved.

This was pretty much on track when i got hit last month, which hampered my capability to program lately. I should be in better shape sometimes this summer, finishing the job (which was nearly completed anyway).

Regards
Bulat





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please test nanozip 0.08! and it will be great if you will test all its modes (optionally publishing in official table only 3-5 best ones)
  
Moderator-Comment: On the list!
Fu Siyuan

Location:
China


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http://encode.dreamhosters.com/showthread.php?p=12067

Hi csc3.2 update to alpha4

parameters:
csc32a4 -m1/2/3 -d## sourcefile outfile
csc32a4 outfile sourcefile

d## means dictionary size ##,default -m2 -d64
  
Moderator-Comment: Thanks!
Runking

Location:
United States


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Please test YZX archiver from ppmx.ru
is very strong!
  
Moderator-Comment: Thx. Was already on todo list.
Bulat





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i don\'t think that 7-zip 9.13 is any faster than 9.10
Gish

Location:
United States


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Could you please update the Multiple file compression test with the most recent release of 7-zip (9.13) and FreeArc (0.666) ?
They both should offer significant improvement in compression speed.

Nice site!
  
Moderator-Comment: Both are on the todo list. I will start as soon as my computer is free (currectly used for something different), hopefully next weekend.
Glenn Davis

Location:
United States


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Check out www.xtremecompression.com, a new website focusing on structured database compression. Xtreme\'s methods are for multidimensional data only; they don\'t compress text and they certainly won\'t work on Lena! But they do compress and decompress database data better and faster than any general-purpose methods -- just click on the \'Compare\' page to see comparisons on TPC-H, a common, standard benchmark.

BTW, I seem to be the only one on the planet working on this problem. There were two others, but since Oracle hired both of them recently, chances are you\'ll never again hear from either of them!
DAVID ALEJANDRO DIAZ CUEVAS

Location:
Mexico


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I HAVE DEVELOPED THE ULTIMATE COMPESSOR, I WOULD LIKE TO SHARE IT WITH THE WORLD
  
Moderator-Comment: \rm -rf ?
Bulat





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FreeArc 0.666 is just released. I expect it to be 1.5-2x more efficient that 0.60 due to new multithreaded compression (freearc 0.60 -mex1..4 modes now are -m1..4). Please benchmark it!

http://freearc.org/Download.aspx
  
Moderator-Comment: Nice release number Smiley

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