Compression decreases the size of data.

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0
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5answers
36 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
votes
2answers
41 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
35k 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
28 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
22 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
53 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
34k 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
22 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
86k 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 ...
8
votes
2answers
5k 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 ...
1
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0answers
9 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
513 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
129 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
12 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
20 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 ...
0
votes
0answers
36 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 ...
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 ...
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 ...
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 ...
1
vote
1answer
33 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 ...
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 ...
1
vote
1answer
610 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
17 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?
18
votes
4answers
41k 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 (...
26
votes
7answers
30k 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 ...
1
vote
1answer
236 views

Is there an alternative to httpfs2 to mount web urls in Linux?

Currently I use httpfs2 to mount direct web urls in the filesystem. For example a rar archive which has to be decompressed, but I don't have enough space on my VPS to download AND then decompress the ...
1
vote
4answers
7k views

How to reduce the size of windows OS Iso file?

I have an Iso file of windows 8.1 pro with December '14 updates. The problem is the file is too big to be burned on a normal 4.7GB DVD , its around 4.8. Now is it possible to remove a few updates so ...
1
vote
2answers
33 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 ...
2
votes
1answer
30 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 ...
21
votes
3answers
72k views

What are the best options to use when compressing files using 7 Zip?

I often have to gather log files and upload them to a central server (Owned by another company). The central server has a size limit of the file, so I am trying to create the smallest file possible ...
9
votes
1answer
2k views

Hide NTFS compression blue double arrow icon overlay

Since the last Windows 10 update I have these blue double arrows on almost every item (all files & folders that are NTFS compressed). How can I remove these?
1
vote
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 ...
0
votes
2answers
1k views

Does putting media files in archives help save space?

For example if you used WinRAR or Winzip on .mp3 or .wmv files would it save disk space? I thought the answer was no because the compression was already built into their encoding. But then I red this ...
0
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0answers
85 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
votes
0answers
18 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 ...
1
vote
2answers
32 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 (...
1
vote
2answers
692 views

Compressing multiple files into multiple archives?

I have a folder full of pdfs and I'm tired of Winraring each file separately. I don't want to put them all in one archive. Isn't there a command line I can use to make Winrar compress a file with ...
0
votes
1answer
29 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 ...
16
votes
7answers
17k views

.tar files without directory structure

I'm .taring some files with the path example/super_user/Output.*. The resulting .tar looks like this: + example + super_user - Output.zip - Output.xml - Output.txt ...
25
votes
7answers
3k views

Why doesn't Gzip compression eliminate duplicate chunks of data?

I just did a little experiment where I created a tar archive with duplicate files to see if it would be compressed, to my awe, it was not! Details follow (results indented for reading pleasure): $ dd ...
1
vote
2answers
67 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 ...
16
votes
4answers
13k views

Is it safe (or advisable) to compress Windows Installer folder via NTFS compression?

The title pretty much explains the question. Aside from the obvious (speed), is it generally safe or advisable to compress via NTFS compression the C:\Windows\Installer folder given that it's within ...
0
votes
1answer
25 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 ...
-1
votes
1answer
960 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
votes
1answer
24 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 ...
1
vote
2answers
53 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....
0
votes
0answers
15 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 ...
2
votes
2answers
931 views

FFMPEG / libx264: How to specify a variable frame rate but with a maximum?

Instead of providing a fixed frame rate to FFMPEG/libx264 (-r/-framerate), I would like to specify a variable frame rate with a MAXIMUM value, and allow libx264 to down the frame rate as it sees fit. ...
1
vote
3answers
3k views

Is there an rsync alternative, that stores compressed and encrypted?

I'm looking for a suitable off-site backup / file synchronization solution. Both local client and remote server run linux. Storage space on the server is limited, bandwidth between client and server ...