Compression makes files smaller in size.

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6
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5answers
2k views

Whatever happened to compressed read/write filesystems?

Back in the 90s, my home computer was an Acorn Archimedes. It had on it a piece of software called ArcFS, which allowed you to create compressed archives, a bit like zip files. Unlike zip files, they ...
1
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2answers
2k views

How do I compress a vmlinux kernel into vmlinuz?

The question is pretty much summed up by the title - I've just built a kernel which has generated the vmlinux output file. How do I compress this into a vmlinuz image?
1
vote
2answers
441 views

Is there a way to determine the original size or file count of a 7-zip archive?

I know that when I compress an archive with the 7za utility, it gives me stats like the number of files processed and the amount of bytes processed (the original size of the data). Is it possible, ...
1
vote
2answers
230 views

Looking for Unix tool/script that, given an input path, will compress every batch of uncompressed 100MB text files into a single gzip file

I have a dump of thousands of small text files (1-5MB) large, each containing lines of text. I need to "batch" them up, so that each batch is of a fixed size - say 100MB, and compress that batch. Now ...
2
votes
1answer
129 views

JPG compression setting for consumer-quality vacation photos?

When I'm saving a JPG file, Paint Shop Pro (Windows) and Gimp (Linux) show a pop-up to choose the JPG compression level. The apps have something like 85 as default value, and I think reducing the ...
0
votes
2answers
1k views

Advanced file compression software for Mac OSX

Back when I used Windows, I always used WinRAR for file compression and decompression. It had a fair amount of options like 'just storage' vs 'hard compression', password protection and archive type. ...
1
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1answer
255 views

Compression of large files

I am trying to compress large datasets (from 15-400 GB each). I am looking for the best compression software for Mac that has High compression rate. Is fast I have tried 7zX, which has excellent ...
2
votes
1answer
1k views

Set default options for WinRar

Is there some method for setting the default extraction properties for WinRar? I want to make it so that I can open a rar file, press Alt-W and have it decompress to a default location and have it ...
1
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2answers
276 views

AAC 256kbit to MP3 320kbit conversion. I know it's lossy, but how?

Has anyone ever transcoded music from a high-quality aac to an mp3 (or vice-versa). The internet is full of people who say this should never be done, but apart from the theoretical standpoint that you ...
6
votes
1answer
3k views

Multithreaded support in 7za

(I posted this first on serverfault, but then I realized it probably belongs here.) I'm trying compress a very large text file using 7za (p7zip) 9.20. The -mmt option doesn't seem to have any effect. ...
1
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3answers
6k views

How to compress a JPG image File

I am trying to send an email with an image attachment. But the image size is 40MB and the attachment size can only be 25MB. How can I compress the size of the image so that I can send it via Email?. I ...
12
votes
2answers
27k views

Different compression methods in 7zip: Which is best suited for what task?

So there are different compression methods in 7zip. Which method is best suited for what task? For example: One difference between LZMA and LZMA2 is I can choose all my cpu cores, whereas in LZMA 2 ...
4
votes
2answers
7k views

Convert old videos to have smaller sizes

I have some videos from a few years ago,with various formats, such as avi, mpg, wmv, rm, rmvb, .... Their sizes are huge(more than 500 MB, and sometimes > 1GB). Given there may likely be some ...
1
vote
1answer
72 views

Is there a compression method for compressing a group of very similar files, without archiving them?

I want to compress a large nuber of files that have near identical headers, and also some data, however I do not wish to archive them, nor do I wish to zip them individually(because the copression ...
1
vote
1answer
719 views

Batch compress mp3 while retaining file and directory structure to new target

I have a master directory of music which is organised using subdirectories. My new (cheap) MP3 only holds 8GB so I wish to make a reduced version of my music with a lower bitrate. Is there a free ...
1
vote
0answers
647 views

Set .png default compression in Photoshop CS6

Is there a possibility to set .png default compression options to "NONE / fast"? Whenever I try to save as .png, the default option is set to "smallest / slow".
1
vote
1answer
4k views

Batch resize and compress PDF files

I need a way to size down and compress batches of PDF files. I'd prefer to do this on Windows, but Linux would be fine if it meant a smoother workflow. I know that there's programs such as NitroPDF ...
0
votes
5answers
2k views

Zip multiple folders indvidually, automatically

I have folders full of photos within category folders eg holidays spain france italy family son daugher christmas 2010 2011 ... except much longer ... there are about 100 folders. I need ...
1
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2answers
5k views

How to extract .arc files

I downloaded a software from the internet which is in .arc format. How can I extract the files on MAC? The arc file is 4GB, but I believe it will be 30 GB when extracted.
1
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2answers
323 views

How to further optimize PDF filesize?

I've been combining PDFs into a single file with Acrobat X Standard and have been able to get a 30-page document down to ~8MB. I've been seeing numerous similar documents that are just as, if not more ...
1
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1answer
93 views

Guess compressability of a large file

I have a large file (~20 GB) and I want to quickly make an (approximate) estimate of how well it can compress. I want an program which can provide an immediate guess at the compressed filesize, and ...
3
votes
2answers
781 views

20GB+ worth of emails in my /home what is a better solution for that?

My email storage requirements are outgrowing anything reasonable with respect to local mail storage. As we speak 99% of my home partition is filled with personal mail in Thunderbirds mail dirs. ...
0
votes
4answers
2k views

compress big files on linux

I got a several of big files using command mysql> select * into outfile ... for example, dump_news.sql, dump_weibo.sql, dump_report.sql ... The total size is about 7.6G, I use command tar ...
0
votes
1answer
1k views

Unzip an archive that was split into 2 files

I have 2 zip files that were split using: zip -r -s 15 my_file.zip my_file.pdf Now I have 2 files: my_file.zip my_file.z01 How can I unzip them? Doing unzip my_file.zip I get: Archive: ...
3
votes
4answers
524 views

Losslessly compressing similar images?

I need to reduce the size of my photo library so I naturally want to compress them. Many of them are not quite identical, but still very similar (subsequent shots of the same scene). Is there any ...
1
vote
1answer
600 views

Bloated Excel file

Someone send me an Excel file that's 10MB, and thus causes us email problems. When .zip'ed it goes to under 1MB, so presumably there's something wrong with the Excel sheet but is there any way to ...
0
votes
0answers
210 views

How do I compress system files for which I have been denied access?

I need to compress some files in a folder, but my system denies me access from doing so. Since they are system files, how can I compress these files without changing the permissions? I'm looking for ...
2
votes
0answers
362 views

Gifsicle: How to set it to not overwrite the original GIF file if the resulting modified GIF file is larger than the original?

About Gifsicle: Gifsicle is a command-line tool for creating, editing, and getting information about GIF images and animations. One of its features is (from its website): Optimize your ...
3
votes
2answers
217 views

Optimal lossy compression of images

I have a lot of images/documents, where I want quite a low filesize, without throwing away to much information, or cause generation loss with future compression. A) Documents, business cards etc ...
1
vote
2answers
288 views

Multithreaded TIFF to PNG conversion

I'm working with images of scanned books, so hundreds of high resolution pictures. I'm doing conversion work with Photoshop Elements - I can quickly save them to uncompressed TIFF, but converting to ...
0
votes
1answer
499 views

Extracting files from NanoZip archive

I have compressed some files with NanoZip on Linux with: ./nz c a -cc file.nz files/* Now I'm trying to extract them with ./nz x file.nz file_copy/* but I can't find the output. The same goes ...
2
votes
1answer
159 views

Check level of compression of an image

Is there a unix command to check the level of compression or the compression ratio for an image (png,jpeg,gif)? The mac based mdls command displayed a lot of metadata information, but didn't mention ...
0
votes
1answer
85 views

Skip incompressible files

Is there a compression tool which doesn't attempt to compress incompressible files in order to reduce the compression time? It would need operate on a folder (rather than on a single tar file), and it ...
1
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0answers
94 views

Extracting a tar file containing files with Chinese names will make the filenames illegible

On my Mac OS 10.6.8 I had a directory full of files that had Chinese filenames. I proceeded to run tar czf mydir.tar.gz mydir Now when I untar it with tar xzf mydir.tar.gz, the extracted filenames ...
0
votes
2answers
3k views

How do I compress my video without compromising it too much

Alright, i'm down to crunch time. I have a video that I have rendered out for something I have to turn in. The submission requires that it be At Most: 200 MB and be one of the following formats: ...
26
votes
4answers
10k views

How does NTFS compression affect performance?

I've heard that NTFS compression can reduce performance due to extra CPU usage, but I've read reports that it may actually increase performance because of reduced disk reads. How exactly does NTFS ...
3
votes
6answers
2k views

Zip files without compression

I'd like to bundle a number of big files into a single file, to make them easier to share. The files are already compressed (eg. jpeg, video etc), so I don't need compression, only archiving. How can ...
0
votes
2answers
182 views

Compressing Notebook Files

I need to compress and upload a Smart Notebook 10.8 file for uni along with hundreds of other students! Even though the file is only 3.7 MB, I am still having trouble making it smaller. Can you help?
2
votes
1answer
390 views

What's the quickest way to a minify a SQL file from the command line?

I want to run a single batch command that must take mySQLfile.sql and compress it by minifying it. Any suggestions on how to get mysqldump to produce the most compressed SQL file? It would be cool if ...
0
votes
1answer
3k views

How can I compress a movie to a specific file size in Windows 7's Live Movie Maker?

In previous versions of Windows Movie Maker I could take a raw video file and specify the file size to compress it to, and Movie Maker would compress it accordingly (with the appropriate loss in ...
1
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1answer
156 views

pdf compressor on Win 7

I would like to know a preferably free software to compress PDFs on Win 7 so that I can email them. I came across this one, but it requested that I enable User Access Control so I am a bit wary.. ...
2
votes
3answers
14k views

Can I compress a RAR file again to reduce its size?

I had a 326 MB iso file that I compressed using WinRAR, with the best compression method. It got compressed to 144 MB. I want to compress more and want it to be limited to something around 22 MB. ...
1
vote
1answer
369 views

Copying a large number of small text files between two servers over WAN

We have a few thousand small files (2-20KB) to copy between servers in one folder for backup purposes. Currently the process is automated as a cron job and does of SCP copy of each file to the remote ...
0
votes
1answer
91 views

Carve data in RAR archive that was incompletely downloaded

Is it possible to perform data carving the data (contents) of a .RAR archive, in its compressed form? I cannot uncompress/extract the .rar file because I could not completely download it. I downloaded ...
0
votes
5answers
2k views

Word 2007 file too big

I have this novel I'm formatting. It has 37 images, most of them greyscale. They are all under 100 kb each. Most of them are under 50 kb. So I already know it's NOT the images. It's. Not. The. Images. ...
0
votes
1answer
294 views

A good software to compress (archive) files to lesser size at possible [closed]

I'm looking for a software to compress (archive) files to lesser size at possible. I downloaded an zip file that was 10 MB but after exracting became 1 GB !!! The compression was wonderful. But I have ...
2
votes
1answer
556 views

Estimating compressed file size using a list parameter

I am currently compressing a list of files from a directory in the following format: tar -cvjf test_1.tar.gz -T test_1.lst --no-recursion The above command will compress only those files ...
0
votes
1answer
273 views

perform data carving on unallocated blocks/sectors of NTFS volume

I have used an app called blkls from The Sleuth Kit to extract (copy) (output) the unallocated blocks/sectors of an NTFS volume. By default, with no additional switches/options, blkls will ...
11
votes
5answers
4k views

Fastest GZIP utility

I'm looking for the fastest gzip (or zip) utility. I have a LVM volume which 95% exists out of blank 0's, so compressing that is very easy. I'm looking for the most fastest solution, and don't really ...
2
votes
1answer
76 views

low-pass filter for vector graphics

I have a SVG file which is too large. It contains a lot of fiddly details and I would happily eliminate some of these to simplify the whole file. With jpeg and other lossy compression formats, you ...