Compression decreases the size of data.

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6 views

Unable to turn off image compressor in Word

When I run Word 2015 for Mac and try to turn off picture compression by File > Reduce File Size... I choose Use Original Quality and then click OK, but then the settings are not saved. When ...
3
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2answers
19 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 ...
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0answers
15 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 ...
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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 ...
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0answers
17 views

GhostPDF Compression Issue [closed]

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 ...
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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 ...
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1answer
12 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 ...
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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 ...
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0answers
14 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 ...
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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 ...
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0answers
13 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....
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1answer
17 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 ...
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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 ...
0
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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:...
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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,...
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1answer
22 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 ...
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0answers
24 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 ...
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0answers
105 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 ...
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6answers
78 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 ...
2
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2answers
65 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 ...
3
votes
1answer
35 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 ...
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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" ...
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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 ...
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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? ...
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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 ...
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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 ...
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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 ...
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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 ...
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1answer
40 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 ...
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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?
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2answers
35 views

How can I compress multiple files to multiple zip using 7-ZIP?

for example I have one folder which contains below mentioned files: 001.txt 001.doc 002.txt 002.doc 003.txt 003.doc Continue.... I want all similar file names each in separate zip. e.g. 001.zip ...
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1answer
37 views

How to compress audio track in to another track in ffmpeg

I'm trying to correct some volume issues on a couple movies. some of my movies have audio from 5.1 surround playing from stereo speakers, causing the volume to be really quiet for dialog and loud for ...
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1answer
21 views

How do .rar utilities manage to decompress a hidden compressed file (which is actually binary content appended to another file)?

After a puzzle in puzzles.SE which involved a hidden file appended to a gif, I have a question regarding appended .rar files. By this question I understand why I can add a .rar file content at the ...
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3answers
41 views

Removing pages from PDF doesn't reduce size

Have a PDF (20MB) with 10 pages. I'd like to cut the PDF in two parts of less than ~12MB (mail sending limit). created part1.pdf with pages 1-5 (6 to 10 removed) created part2.pdf with pages 6-10 (...
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0answers
27 views

How to compress ext4 partition with Acronis while backup?

With Acronis, when I set to compress ext4 partition before backup, the result is a raw backup and not compressed. The same process with NTFS or FAT32 partition, results are compressed. Please tell ...
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1answer
40 views

Create Send-To-Compressed(zipped)-folder event shortcut on Windows10

I have a really simple question to which I haven't been able to find the right simple answer to. I'm working a lot with zipped (compressed) folders. I want to improve my workflow. After selecting all ...
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2answers
81 views

Batch compress .avi files with ffmpeg which contain previous date in their name

im trying to manage CCTV footage, and im trying to batch compress them with ffmpeg So far i managed to come up with this command ffmpeg -i "0515 210004.mp4" -b 200000 output.avi But i need to do ...
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0answers
117 views

How to compress Tesseract-encoded PDFs while maintaining embedded text from OCR?

I've been experimenting with using Tesseract to OCR my PDFs, and it has been mostly successful, particularly with German Fraktur texts (the old style gothic print), which tools like Adobe Acrobat can'...
0
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1answer
27 views

Jpeg File Zipping does not compress at all

i'm trying to compress some jpeg photos, the total dimension is around 150MB, but when i try to zip it using the maximum compressing rate, i keep getting something around 150MB. I tried with Winrar ...
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0answers
16 views

Convert a file from PNG to TIFF restoring TIFF Data

I have a software, that extracts TIFF data from a file and convert this file to PNG (TIFF has a default header with some bytes to be replaced on(width, height, stripbytecounts), so i replace those ...
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2answers
84 views

pg_restore fails on zlib compressed dump

Created a dump of a postgresql (windows version 9.3 or 9.4) database with the command: C:\>pg_dump -U user -Z 6 database > db.dump restoring it with psql or pg_restore fails: C:\>psql....
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1answer
1k views

System and Compressed Memory: High Disk Usage

System and Compressed Memory is something I had for a long time Ever since I got this new computer, when starting up my computer, System and Compressed Memory (ntoskml.exe) has been using very high ...
0
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2answers
31 views

Can 7-Zip store the final archive to a custom path on a different partition?

I have a folder "D:/Tutorials/Exercise files" I want to compress "Exercise files" folder and put it on E:/Tutorials/ folder, that is on drive E: automatically from within the 7-zip program. Does 7-...
0
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1answer
38 views

Is there a way to toggle the Windows “compress this drive” command through a command prompt?

My friends laptop (a 64-bit Windows 7 Home Premium with 4GB RAM) was running slowly and she asked me to take a look at it. One of the things (besides that the disks had not been defragmented for a ...
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4answers
66 views

how to verify whether a compressed .gz is corrupted or not?

I have many gz downloaded from the internet, and I would like to make sure they are not corrupted. Does the fact that I can open the archive with winzip on windows proves that everything is fine? I ...
0
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1answer
25 views

Recompressing zip - integrity check

I have multiple large zip files and I would like to recompress them without unpacking them (I run the risk of running out of disk space). I am thinking of using advzip for that task. However, I want ...
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1answer
457 views

OpenVPN Bad LZO decompression header byte: 69

On Arch Linux I run OpenVPN 2.3.9 server and I get this error "Bad LZO decompression header byte: 69" I run the client on a rooted Motorola XT1039 android lollipop 5.1 and I use official "OpenVPN ...
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0answers
9 views

How to save as a Video-TS-BUP using DVDShrink

Using DVD Shrink 3.2 I compressed a video that had been converted from MP4 using ConverXtoDVD, however after it was compressed it appeared in my G drive in a format that would not play rather -by ...
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0answers
21 views

How does motion estimation work?

I am trying to understand the basics of video compression. I have found many resources addressing this particular subject, but somehow, I haven't clarified it yet on my mind. How does motion ...
2
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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 ...