Compression decreases the size of data.

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2
votes
2answers
13 views

Uncompress using tar -xvzf results in a folder with less size than compressed file

I have a file called DW.tar.gz in a RHEL 6 which has a size 539MB. But when it is uncompressed using: tar xzvf DW.tar.gz the resultant folder only has 44KB. The linux shell doesn't display any error ...
-1
votes
0answers
14 views

How to check if .rar file is password protected or not without extracting it in c#?

I am developing a small utility in c#, where I am inserting many compressed files. These files are in different extensions(such as .zip, .rar, .tar, .uue) Now I do not want to extract these files, but ...
0
votes
0answers
9 views

How can i make SFX from WinRAR and make WinRAR can't read it?

I want to pack all my setup files to WinRAR SFX. But i want it get passworded, both the files and the header so the other user of WinRAR can't extract it directly from WinRAR without a password. So i ...
0
votes
2answers
3k views

How to compress 14 GB of csv files with 7zip (minimizing space)?

I have to compress 14 GB of csv files with 7zip. What options should I use to achieve the highest compression? I have tried Ultra Level with both LZMA and PPMd compression method, obtaining results ...
-1
votes
0answers
17 views

GhostPDF Compression Issue [on hold]

I am facing an issue while compressing the PDF which is embedded with images. The issue is, I have used the following GhostScript Compression command. Actually I thought that it would reduce the ...
-2
votes
1answer
21 views

Get all paths of compressed files in folder and subfolders

I have a directory with many subdirectories which themselves have subdirectories and so on recursively. I need to get a list of all paths of compressed files in that directory recursively and write ...
-3
votes
0answers
43 views

fastest archive format for quick search and random access [closed]

I am going to store a lot of small files (<4Kb) in compressed archives and i'd like to pick the container format that gives the best search and decompression speeds. So far I've found that: tar ...
0
votes
1answer
11 views

How does compression of lossless images work in GIMP?

Compression level: Since compression is not lossy, the only reason to use a compression level less than 9 would be a too long time to compress file on a slow computer. Nothing to fear from ...
10
votes
4answers
1k views

More efficient file compression program for many identical files?

I am doing a backup of my work and I'm looking for a program that can more efficiently compress files. The windows default compression program works fine, but it doesn't work as "smart" as i would ...
8
votes
2answers
6k views

How do I use the Google data compression proxy on Firefox?

I am using GNU Icecat (GNU version of Mozilla Firefox) on Trisquel GNU/Linux. In order to minimize/optimize data usage while web surfing, I want to use Google's data compression proxy. So, how do I ...
0
votes
0answers
7 views

How to uncompress an OpenVPN stream with lzo compression?

Hello I'm connecting to a VPN server using OpenVPN and the configuration file contain the parameter lzo-comp=yes meaning the data is at least compressed using the lzo algorithm. With Wireshark I'm ...
0
votes
0answers
13 views

PDF program or app for xubuntu to compress bulk files with GUI

I have searched and researched internet to find a program or app for xubuntu to compress bulk pdf files, but I cannot find, I found a Nautilus script to do that but I don't know if it works in xubuntu ...
2
votes
2answers
4k views

7-Zip command line -p switch is not working according to the help page

I want to be able to automate the encryption of the file type .pcapng in a Windows batch script. My current problem is that I get an error when extracting the encrypted file saying something along the ...
0
votes
0answers
25 views

Why does my image's quality go down when saving PPT to PDF?

In power point 2013, on the first slide I have this picture in PNG Aftering saving the PPT to PDF it becomes As you can see the image has became blurry around the edges of the letters. Now this ...
0
votes
1answer
15 views

How do I configure ipsec and xl2tpd to not use compression when connecting to VPN?

I have two config files: ./etc/ppp/options.xl2tpd.myvpn_name ./etc/ipsec.d/myvpn_name.conf and somewhere in one of them I need to say "no compression" because I error I get is: Unsupported ...
0
votes
0answers
11 views

How to open a “Cached Theme.pak” in a Chrome theme CRX

I am able to open CRX files by changing the file extension to .zip, but when I am trying to get files that make up a theme, I can't find any. I'm assuming their in a file with the name "Cached Theme....
0
votes
1answer
3k views

Split a folder of files into multiple zip files based on size or # of files

My problem is that the file uploader I'm working with will only allow a zip file with a size of 10mb or less. Unfortunately, I have thousands of files that need to be processed and I do this by ...
0
votes
0answers
50 views

Files corrupted after Defragmentation

This is my first post in this forum. The Problem: Today, I decided to defragment and optimise my 2TB external Hard Disk using Auslogics Defragmenter. Now, a little background here. The partition ...
0
votes
0answers
11 views

Should I consider data integrity issues when choosing a file compression algorithm?

Is there a relation between a data compression format (zip, gzip, bzip2, etc.) and it's ability to ease in recovering broken data? I want to store some backups (like tar.gzs) but then I started ...
23
votes
4answers
45k views

What is the cause of a high CPU usage of 'system and compressed memory' in Windows 10?

There is an observation to be made for Windows 10 on my laptop running with 24G memory available, and 2.5G used. There is no 'memory pressure'. Other questions have looked at memory consumption (...
2
votes
3answers
919 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
1answer
17 views

Error when decompress smime file

I receive this file from my friend. I use command to decompress it: openssl cms -uncompress -in myfile.txt -out content.txt but there are error: Error reading S/MIME message 4294956672:error:...
0
votes
0answers
10 views

Email Transparent Compression

Can I compress email messages transparently, like my web server does with HTTP pages? It seems to me that there should be some basic compression/decompression protocol supported by servers and clients,...
0
votes
1answer
21 views

windows extract all not working properly, trying to extract compressed content

for a colleague I have created a zip containing two projects, each having multiple docker images that are compressed to xx.tar inside them. The idea is that I can give her a zip file of the whole ...
2
votes
1answer
3k views

Disabling “System and compressed memory” (ntoskrnl.exe)

I am very exhausted by this. This program is destroying my computer. I have an ASUS G750 series laptop, which has 16gbs of RAM and a haswell i7 inside it. It is just a year old. I upgraded from ...
3
votes
2answers
3k views

Adobe photoshop “not enough ram” message opening a 60 MB TIFF file

I am working with Windows 7 x64 on a full HD monitor, Intel i5-2500K and 8 GB RAM, currently available 5,5GB. I tried to extend photoshop's memory usage and scratch disk settings as following: But ...
0
votes
2answers
801 views

What is the difference in various commands for compressing files in linux?

What are the commands for compressing files in linux and what are the difference between them? (for example: tar, gzip, rar). I'm working on Linux Mint 11 and doing a script for compressing files. I ...
0
votes
0answers
22 views

“XZ-compressed data is corrupt” when booting linux from hdd

Occasinally I get this error message when booting my debian7 from hdd. After I have pressed reset-button several times check disk is started and after it finishes PC boots normally. > uname -a ...
1
vote
1answer
326 views

How can PowerPoint 2013 compress background images (not just inserted pictures) to reduce filesize?

I have a 10-slide presentation that is a whopping 234 MB! This is because each of its slides has a different high-resolution image as its background. (I know that the large filesize is due to these ...
1
vote
6answers
77 views

Advantages of the “Store” compression level in 7zip

I have several thousand images in folders that I want to archive onto an external drive. When googling about compressions I came across the ability to set the compression level to "store" which means ...
0
votes
0answers
104 views

how to disable system and compressed memory (reason? screen freeze)

I have an hp laptop core i7-6700hq 12gb ram preinstalled windows 10 sometimes my screen freezes I think that's because of "system and compressed memory" because as soon as it unfreezes I check task ...
2
votes
2answers
62 views

Can I open .zip files created with 7-zip without 7-zip?

I use 7-zip to create several archives with fixed size (512 Mb) from one big file. And they have strcuture: my_name.zip.001 my_name.zip.002 ... my_name.zip.005 My problem is that without 7-zip I ...
39
votes
6answers
36k views

Compressing folders on a mac, without the .DS_Store

Is there anyway to get rid of the .DS_Store when compressing a folder on a mac? I work on a mac and send work to clients in zip format, but always get questioned on the .DS_Store folder inside them. ...
3
votes
1answer
34 views

How can I compress video by taking advantage of its static content?

I have an HD video that is a presentation, so it consists mostly of still images. It's a 50 minute, 200MB MP4 file, downloaded from YouTube. Is there a way to take advantage of the static nature of ...
0
votes
3answers
36 views

Unable to extract Zip files with password

I am unable to extract zip files secured with password using the Windows built-in compression utility. It prompted me for password and after I supplied one, it kept complaining "wrong password" ...
0
votes
2answers
67 views

How can I quickly decompress a 1TB (5 million file) 7-Zip (7z) file stored on a NAS

There is a 7-Zip (7z) file (size: 1TB with about 5 million files inside) in a NAS device running in iSCSI mode. The 7-Zip file was compressed by the “only store not compress” mode. When the files ...
16
votes
4answers
35k views

What is the quickest, easiest way to compress an MP3 file?

I would like to compress an MP3 file, and I see a lot of references when searching Google, but it seems like by now someone must have found something easy and that is guaranteed to work. Compressing ...
0
votes
2answers
23 views

Why can I still read compressed files?

Why is it that when I Zip some files in Windows and double click on the resulting file, I can still see all the files in their original form? Since they were compressed, shouldn’t they be illegible? ...
4
votes
2answers
3k views

Synchronizing files using 7-Zip and the CLI

On the command line, 7-Zip has the command 'a' to "Add files to archive". But I want to synchronise the files instead. This is one of the main options in the GUI, but the CLI has disregarded it for ...
76
votes
5answers
88k views

How to specify level of compression when using tar -zcvf?

I gzip directories very often at work. What I normally do is tar -zcvf file.tar.gz /path/to/directory Is there a way to specify the compression level here? I want to use the best compression ...
1
vote
0answers
10 views

Massive artifacts introduced when clipping beginning and end of (lossy) video in OpenShot

I'm new to video editing and am attempting to do a simple 'cut off the beginning and end and add a soundtrack' job in OpenShot. The trouble I'm having is with horrendous artifacts in the exported ...
-1
votes
2answers
520 views

When compressing a file on command prompt with RAR command, how to stop the process without cancelling it?

I used the following command: rar a -m2 file.rar *.xml \\myroute\ I want to stop the process on the file that have already been processed i.e. using Ctrl + C will cancel the process but not finish ...
-2
votes
2answers
130 views

7Zip Zipping up directories

I want to use 7 zip to compress and archive folders but I want it to exclude existing .7z files if they exist and not duplicate them with a .7z.7z ext. I found this but it duplicates the already ...
0
votes
1answer
16 views

Compress only specific files from a folder while preserving folder structure

Say I have 1 main folder and 10 sub-folders, each with .avi, .html ,.txt and .srt in them. Now I want to preserve the folder structure but I want to only compress the .srt files into .7zip. Is there ...
0
votes
1answer
25 views

7-Zip Ultra - Does zipping multiple other 7-zip ultra compression files have any significant size difference?

I have a lot of files, mostly png and pdf, some svg, some various others, that need to be transferred. Multiple TB worth, files individually aized anywhere from a few kb to a few mb. The problem is ...
5
votes
5answers
12k views

How to extract multipart rar with missing parts?

I have a multipart .rar archive containing a single .tar.gz file inside it (don't ask why, that is just how it was made). I am missing a few of the parts, but do have the first part. I would like to ...
1
vote
1answer
39 views

Windows- how do I create my own file extensions, and associate them with my own program?

I have developed a C# WPF application that will display .pdf files to the user. The user can load the PDF directly File --> Load --> (select PDF file) --> Open after selecting the PDF, and ...
1
vote
1answer
617 views

Why does FFmpeg append blank black video to the end of my MP4 files when compressed from MOV?

I have several large MOV files that I want to compress to MP4. Unfortunately, when I use FFmpeg, it appends lots of black (blank) video at the end. (The destination file is longer than the source ...
0
votes
0answers
19 views

Automatically Zip SQL Backup Files

I have a windows server 2012 server pulling a backup of my database every day but need to compress it. Can I use Task Scheduler to automatically zip my SQL file and delete the larger original file?
26
votes
7answers
31k views

Is it possible to open a self-extracting compressed Windows file on a Mac?

If I have a compressed file that's stored as a self-extracting archive for Windows, i.e., a .exe file, is it possible to convert it to a zip file that can be unzipped under OS X? Alternatively, is ...