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Blue.
Enjoy the silence



Registered: Apr 2001
Location: Mississauga
Turn a 700MB file into a 100MB file

I've seen compression that can do that but I don't know any programs that do it. I've gotten games that were zipped and like 100MB and unzipped the contents were like 700MB. Programs liek WINRAR can only shave a few MB's off of it after RAR'd but I need a program that I can make 1 RAR/ZIP/EXE file that will be like half the size of the files or at least have amazing compression. Wether I have to span it into like 3 or 4 RARs I need a compression program that will ZIP/RAR/EXE a file and make it a lot smaller.


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Old Post Aug-11-2002 04:16 
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whiskers
old skool



Registered: Sep 2001
Location: in your dreams

it all depends on the type and the size of the file.

the games were so compressed because there were a lot of little files that were either text or executables. if you wanna compress mp3/video, then forget about it. a 7:1 ratio does not exist... so far it's about 1.0001:1


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Old Post Aug-11-2002 04:20  Ukraine
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Blue.
Enjoy the silence



Registered: Apr 2001
Location: Mississauga

quote:
Originally posted by TiestoInTheMix
it all depends on the type and the size of the file.

the games were so compressed because there were a lot of little files that were either text or executables.


No it was a single BIN file in a single ZIP archive.


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Old Post Aug-11-2002 04:27 
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PatMcGroin
lost



Registered: Sep 2001
Location: here? there?

quote:
Originally posted by trance_n_dance


No it was a single BIN file in a single ZIP archive.


i'm sorry, but thats bullshit. don't you think we would be taking advantage of that if it was possible??? now...onto my traditional *slap*

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Old Post Aug-11-2002 05:40  Germany
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KilldaDJ
birth.school.trance.death



Registered: Sep 2001
Location: tranceaddict wants to know your location
King

BIN is a raw cd image, of course they can do that
ive seen a psx bootdisc that was like 48mb and comp'd down to like 1mb
not bad i suppose...


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Old Post Aug-11-2002 08:31 
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LiquidKernel
Junior tranceaddict



Registered: Mar 2002
Location: San Francisco, CA

quote:
Originally posted by KilldaDJ
BIN is a raw cd image, of course they can do that
ive seen a psx bootdisc that was like 48mb and comp'd down to like 1mb
not bad i suppose...


That most likely because the rest of BIN has empty sectors. Hence the ZIP compression was able to save up the repeated null characters.


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Old Post Aug-11-2002 08:48  United States
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Durafei
the crazy russian



Registered: Oct 2000
Location: San Francisco, California

Compression ratio depends just as much on the type of the fyle to be compressed as it does on the program you use to compress the file.
You can often get 7-1 ratio on text files, executable files and such but not on file formats like jpg, mpg, gif, mp3 and other types of media. That is because files in these file formats are already compressed. There is nothing left to compress there


In case you are interested, zip compression is working using Lempel-Ziv algorithm. Basically it works by finding many possible repeated subsequences and substituting them by shorter subsequences.
Here is the animation of how it works:
http://www.data-compression.com/lempelziv.html


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Old Post Aug-11-2002 12:49  Canada
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Blue.
Enjoy the silence



Registered: Apr 2001
Location: Mississauga

O.K can someone please actually post something that helps me and help my problem.I'm looking for a program that compresses files to become as small as possible. If nobody knows the one that cuts the size in half then tell me one you know that is good.

quote:
i'm sorry, but thats bullshit. don't you think we would be taking advantage of that if it was possible??? now...onto my traditional *slap*


And why exactly would I lie about something like that? I'm trying to get people to help me not to piss people off. It's obviously possible if I've seen it done and I'm not gonna lie about something since the whole topic is me looking for that program or one thats good at archiving.


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Old Post Aug-11-2002 17:41 
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jp
Retired tranceaddict



Registered: Apr 2001
Location: Holland

I like Irish beer and women. Does that count?

Old Post Aug-11-2002 18:01  Netherlands
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Durafei
the crazy russian



Registered: Oct 2000
Location: San Francisco, California

WinRar - absolutely the best!


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Old Post Aug-11-2002 21:35  Canada
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RenderedDream
what should i put here?



Registered: Dec 2001
Location: Aveiro

well both winace and winrar compress @ 4096k dictionary.. so any of these are good


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Old Post Aug-12-2002 00:08  Portugal
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k.k.d.
Kostu-san



Registered: Jul 2001
Location: Montreal

Modern compressing algorithms (zip, rar, etc) basicly use the multi-passing hoffman algorithm to compress... You can't expect it working miracles... You can't really compess video or audio much beyond the standard formats you find on the net since they are already "compressed". Recompressing a comrpessed forman is almost useless... It can shave off few kb though, but it's useful only if you can;'t fir a 705 meg file on a 703 meg cd.. On the other hand, some non-compressed data (such as long text files with few distinguished characters/patterns) is very compressable: from 40% to 80%, in fact.


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Old Post Aug-12-2002 00:22  Russia
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