Compression is the process in which a file or folder's size is reduced by using an algorithm to encode the same information using fewer bits.

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6
votes
4answers
20k views

How can I maximum compress video files?

I received 4 .mov files from a client that they want on their mobile website via SlideShowPro. Each original file was between 200 and 400 mb. I've gotten each one down to about 30 mb using ...
20
votes
4answers
38k views

What's the easiest way to unrar a file?

I just realized I can't unrar .rar files on my Ubuntu machine! What's the easiest way to accomplish this fundamental task? If possible I'd love something like 7Zip that I can just right Click, and ...
80
votes
10answers
151k views

How can I reduce the file size of a scanned PDF file? [closed]

I have a 72.9MB PDF file that I need to shrink into under 500KB. The file was a JPEG image that I had scanned, and then converted to pdf.
13
votes
1answer
5k views

Is there a way of leveling/compressing the sound system-wide?

As a Laptop user, I'm sure that a lot of people, even the ones using Netbooks would have already gone through this problem. Especially when listening to podcasts, and using it as an example, the sound ...
4
votes
2answers
467 views

how do I get maximal compressed screenshots?

I'd like to compress my screenshots as much as possible before I send them via email. The best compression ratio I only got with some work on each screenshot: first I took the screenshot with ...
14
votes
3answers
4k views

How can I compress an mp3 file?

Well that is my question! i used to download a program in windows that used lame to compress audio of mp3 files and made them shorter in size but I don't know how to do this in ubuntu! Does anybody ...
11
votes
5answers
7k views

Command line archive manager / extracter

I keep forgetting all the corresponding extract commands for every compression format. So I was thinking about writing a script that merely maps file extensions to the appropriate extract command. ...
6
votes
1answer
1k views

Set 7z compression level using GUI in Ubuntu

Archive Manager, or file-roller, doesn't seem to have the option to set the compression level for 7z files. However, the windows client 7-zip has an option to do so using GUI - On Ubuntu/Linux, ...
1
vote
1answer
4k views

7z “ultra” settings for zip format

7z "ultra" settings for .7z format are: 7z a -t7z -m0=lzma -mx=9 -mfb=64 -md=32m -ms=on What are the "ultra" settings for .zip format (using 7z)?
11
votes
2answers
20k views

Compressing folders with password via command line

I would like to know whether it is possible to do the following via CLI. I have a Folder F which contains several sub folders and some files. I want to compress folder F into .zip file with the ...
3
votes
1answer
3k views

btrfs and missing free space

I converted my ext4 partition to btrfs and deleted the save subvolume after doing so. Then I enabled the compression (lzo) of the filessystem in the fstab file and everything is correct so far. Then ...
5
votes
2answers
2k views

Change default compress option in Nautilus type to zip?

On the right click menu (in Nautilus, desktop, etc), there is a "compress" option. Is there any way to make "zip" the default format for this?
1
vote
1answer
661 views

archive manager does not archive files

The archive manager does not archive files or games and gives the following error: Archive: /media/BA/setup.exe [/media/BA/setup.exe] End-of-central-directory signature not found. Either this file ...
235
votes
8answers
397k views

How do I uncompress a tarball that uses .xz?

I'm used to extracting tarballs with a -xfz flag, which handles gzip and bzip2 archives. Recently I've run into a .tar.xz file and I would like to uncompress it in one step using tar, how can I do ...
18
votes
6answers
12k views

Will btrfs automatically compress existing files when compression is enabled?

I chose btrfs as the format of my / filesystem in the Ubuntu 12.04 LTS installer. After the installation completed, I added compress=lzo to the mount options in /etc/fstab and rebooted. Will the ...
0
votes
3answers
2k views

Linux/Ubuntu native (not Wine) alternative to DVD-Shrink, that can compress a DVD image to a smaller size to fit on a writeable DVD?

An alternative to DVDShrink would be a program able to shrink a DVD movie to a smaller dimension that would fit a standard 4.7 dvd while optionally keeping the dvd-movies structure, menus etc. (that ...
19
votes
2answers
19k views

Best compression method?

I want to compress a 16GB folder, but what's the best method? tar.gz? tar.bz2 rar? 7z? Would the archive be smaller if I first compressed in a method, then copy the compressed archive to a new folder, ...
5
votes
5answers
3k views

What is the difference between different “compression” systems?

I've always used TAR and ZIP for compression, but recently I have heard about the *.Z compression algorithm. This brought up a question for me: With all of these compression systems, which one is ...
4
votes
1answer
236 views

Screenshot tool with integrated optipng or pngcrush

This is a followup question of how do I get maximal compressed screenshots? Is there a screenshot tool that has optipng or pngcrush already included to minimize the filesizes of the png ...
2
votes
1answer
182 views

How can I archive dd's output directly possibly without using any compression?

It has been determined already in this question that tar cannot read input from stdin. How else can a dd output be archived directly possibly without using any compression? The purpose of doing ...
1
vote
1answer
2k views

Is it possible to run `Extract here` or `Compress`/`Create archive`with other archivers than the three listed (in PCManFM)?

I have installed 7pzip and peazip to handle archives but after setting one of them as default and using Extract here or Compress/Create archive I am prompted as below Selecting one in the list ...
5
votes
2answers
730 views

Is it safe to remount btrfs with compression?

I've finally found how to enable compression in btrfs, and would like to do so. However, as my main drive, I'm not really wanting to risk a change that could corrupt the hard drive. Everything I've ...
3
votes
2answers
2k views

Which Compression Format will give the least size

Hi i have a few GBs of files which i am supposed to burn to a DVD for permanent storage, which compression format will give me "LEAST" size, thanks
1
vote
1answer
1k views

Unrar fails when accents are present in filenames

I have the rar package installed. Double clicking on .rar files opens the file in Archive manager. It works fine when folders or files use only characters with no accentuation, but if there is some ...
0
votes
3answers
72 views

Compress folders older than x days

In /opt/abc I have a path where a new folder gets created daily. In that folder a series of files gets created. I would like to run a script every Sunday at 02:00 and compress each folder which is ...
0
votes
1answer
208 views

Zcache Usage in Lubuntu

Recently I appended zcache to my grub configuration: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash zcache" But I am at a loss as to whether zcache is working or if I need to do something else. There is ...
0
votes
2answers
4k views

Missing GUI application for 7-Zip?

I installed 7-Zip from Software Center, but where is the GUI application? Original question asked by a user: ich habe 7Zip aus dem Softwarecentrum installiert, finde aber kein Symbol zum ...