Compression decreases the size of data.

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2k views

How to get compressed memory back in OS X 10.9 Mavericks?

I followed the suggestion to disable compressed memory, now I want to get it back. I checked the code, it was 4 before disabling. So, I tried: sudo nvram boot-args="vm_compressor=4" That was not ...
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1answer
294 views

Force all files in a NTFS compressed folder to automatically compress [Windows]

Is it possible to keep all the files within a NTFS-compressed folder compressed? For example, if I have a compressed a folder using NTFS compression, it will compress all the files inside the folder ...
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2answers
89 views

How to Undo the “Remove Unnecessary Blank and EOL” in NotePad++

I am using Notepad++ for my coding , just used the their Edit > Remove Unnecessary Blank and EOL feature to remove the space and tabs and compressed the code , but how do i UnDo it ? is there ...
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3answers
2k views

Disable Windows 8.1 Component Store (WinSxS/DriverStore) automatic compression?

Windows 8.1 has a new Scheduled Task (Servicing\StartComponentCleanup) which will automatically delete or compress superseded and unused files from the Side by Side store, DriverStore and drivers ...
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0answers
269 views

compressing video with ffmpeg while maintaining high frame rate

Update: I watched the output video on a different machine and it was fine. The issue must've been with the program I was using to watch the video. Nevermind. I'm trying to compress videos taken with ...
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0answers
69 views

Unzip speed on Mac versus Linux

I have a zip file that contains 200mb of data, compressed to an 80mb .ZIP file. Basically it's a website with thousands of files, including code and images, no video. The file was zipped on a linux ...
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0answers
284 views

Stream videos from a server with “youtube-like” compression

I would like to host some videos on a site for a small audience (under 50 people), and don't want to use a site like YouTube or Vimeo, however I would like to have the same kind of load speeds for the ...
4
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1answer
561 views

Avoiding extreme fragmentation of compressed files on NTFS

Problem explanation I'm storing windows disk images created with wbadmin on NTFS drive, and I found compressing then with NTFS compression gives 1.5-2× space conservation, still giving full ...
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1answer
855 views

how to remove full path when doing tar.gz compression

I'm using this command to archive a directory named g from java code: tar czf /a/b/c.tar.gz /e/f/g When the tar file c.tar.gz is created, I find an entire path e/f/g then all files of the g folder ...
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19 views

Windows compressing big file automatically

I have a NTFS shared partition (for my Fedora and Windows 8 installations) and a big truecrypt container on it (not the whole partition). I have no problem mounting this container from Linux, but ...
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2answers
433 views

let tar auto detect compression type when extracting from stdin

I use GNU tar. It can auto detect compression type when compressing/decompressing files. But I need to decompress an archive from stdin and the compress type is unknown. I noticed that tar can give me ...
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50 views

How do I join, decrypt and uncompress my backups?

This is the line I used to back up some files for f in "*"; do tar -ch "$f" | pv | xz -9 -v |openssl des3 -salt -k “mypassword” | split -a 4 -b 200m – “/backups_${f%}.tar.xz_” ; done Now I am ...
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1answer
669 views

Does anyone know an effective method to ultra-compress files?

Does anyone know an effective method to ultra-compress files? You might have seen some PC games compressed to incredibly small sizes here and there (like GTA San Andreas which was compressed to 1mb ...
3
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1answer
106 views

Is there a way to compress files at different compression levels inside a single 7zip file? [duplicate]

Some files are compressed using their own compression scheme and some aren't. If I try Max compression on an already compressed file, I'll get 1%-2% better compression at most. The amount of time ...
5
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1answer
223 views

How to exclude a folder in 7zip?

I want to compress the folder C:\Temp but without a specific subfolder (e.g. C:\Temp\test). How can I do that with 7zip? I've come up with the following command: c:\Temp>7zip a -t7z test.7z ...
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0answers
112 views

New versions of srep failing my compression algorithm

I am currently using freearc, precomp042 and srep 3.2 (32bit) I am running on Windows 7 SP1 x64 with 8GB RAM I use 4 regular compressions styles as noted below depending on data type and have no ...
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0answers
378 views

Increased data usage on a VPN connection

I have been working on a remote computer over a VPN connection using Windows 7 Remote Desktop Connection. I RDP from my laptop (with non-HD display). Recently my wife has also been working from home ...
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1answer
40 views

Strange behavior encountered while using tar

I had a folder of useless C programs for a project. When I was compressing it using tar, I kept using tar -cvf c-project and then realized I'm setting the flag for the file name and I'm giving ...
2
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1answer
416 views

How do I find out the compressed / uncompressed file sizes on btrfs?

I am using btrfs on one of my hard drives. I would like to know the actual file size and the compressed file size on btrfs. I am interested in seeing the compression ratios per file . For example ntfs ...
2
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1answer
49 views

How do I reinforce compression options?

Shortly after I got my computer, I enabled NTFS compression on it, selecting the option to compress "all files and subfolders". I recently noticed that several folders on my PC are not compressed ...
0
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1answer
73 views

Extracting one file from archive: 7-zip requires decompressing entire archive?

I've noticed that when browsing an archive containing multiple files with 7-zip 9.20 Windows GUI, extracting one file for previewing takes significantly longer with .7z than .rar archives. With .7zips ...
2
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2answers
555 views

What does the number after 7-zip's -m switch mean?

7-zip has a command line switch to set the compression method, -m followed by a number, e.g. -m0=LZMA. What does the number (0 in the example) mean? Different numbers produce slightly different ...
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0answers
105 views

How to make compact.exe to compress only folders, but not files?

I have a large and complex nested folder structure on disk. Say, Folder1 <many files> Subfolder1 <many files> Subfolder2 <many files> ... SubfolderNNN Compressing all ...
2
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1answer
130 views

tar: compress only the contents of a folder

I have to compress only the contents of the folder, not the folder with tar, there is any argument for that? I have search but I don't find anything. Example: mainfolder/ asd1 asd2 ...
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1answer
257 views

zip sub folders individually

can anyone help me make a batch file for my problem. i have multiple folders that i want to compress individually. root folder 1 file 1 file 2 ...
0
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1answer
61 views

Human insensitive video compression

I have an AVI video file recorded by my laptop web-cam. It's only 10 minutes but it has so large size, 3.9 GB! I'm not expert in multimedia but I've seen really good quality long movies in only 4 GB. ...
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1answer
2k views

tar/bz2 compress a file removing uncompressed original

Is there any way to turn a directory called dir1 into dir1.tar.bz2 without keeping the original? I need to save space and want to compress some large files but don't have enough room to keep a ...
2
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2answers
110 views

What other archive formats save Date Created and Date Accessed?

7-Zip on Windows will save the Date Created and Date Accessed when compressing a .zip file, however it does not do this for its native .7z format. Any Unix-based formats are ineligible. Are there any ...
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2answers
3k views

What is more efficient / faster, rsync compression or ssh compression?

I currently rsync files: (i) locally and (ii) remotely over WAN (connection c. 8mbps down / 1.5mbps up). I am considering adding to rsync: -z to compress files. Or alternatively adding to ...
2
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1answer
887 views

Windows “Send to Compressed (zipped) Folder [in different location]"

Is it possible to change the “Send to Compressed (zipped) Folder" functionality to create the zip file in a pre set directory, rather than the current one? Also, any information anyone can share ...
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2answers
155 views

How much can data be compressed? [closed]

Is there a scientific limit to how much data can be compressed? What I mean is, compression is essentially representing a larger amount of data with a smaller one, such as representing a=abc b=def ...
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0answers
2k views

7-zip command line -p switch not working according to help page [Solution Found]

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 ...
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1answer
76 views

How can I zip or rar file names in txt file from command line?

I'm using a batch script to output filenames with specific attributes to a .txt file, in this case older than 30 days. I'd like to then zip or rar those files that are listed in the .txt file. How ...
2
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1answer
154 views

Compress the silence - audio file formats

How do you compress audio silence? I'm using Audacity and have been exporting variable compression mp3s. But a 1minute audio track is about the same file size regardless of how much silence there ...
0
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1answer
154 views

How to keep daily tar.gz backup with less redundant data

Like most of you, I have a few daily tag.gz snapshot of a folder (of any application). There is only a few different each other but the tar.gz is not a diff/delta friendly format. Most data in the ...
3
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4answers
1k views

Should I compress hard drives containing large video files?

I have a media computer that stores large video/movie files of about 8GB per file... It is also used for media playback. Is it a good idea to compress the hard drives? how much space would I gain with ...
0
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2answers
270 views

Is there a ZPAQ implementaion that integrates with GUI compressors like File-Roller?

I've tried a number of ZPAQ implementations for Linux, but I don't like that they are all command-line programs, and thus require a lot of typing to get simple things done. My file browser supports ...
0
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3answers
181 views

What are good compression algorithms for delta synchronization?

When syncing large files over a slow link, it is often useful to use delta compression in order to reduce the bandwidth used. It is also useful to compress files as they take up much less space. ...
0
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1answer
140 views

Lossless screen video capturing

Can you capture/record a video playing on the screen using a recording software(or your custom code) such that every pixel is recorded and there is no loss of information ?
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2answers
222 views

Advanced backuping script

I'm currently writing an advanced starting script for my minecraft server. Everything works out as I want it too. But the problem is the backups. I created a function for it. It works also great and ...
0
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0answers
135 views

How can I get RAR to create a segmented archive (volumes) when compressing from stdin?

I have this ZFS box where I'm creating incremental snapshots, then piping them into RAR (4.2) for compression and encryption, and finally backing those files up remotely. Thing is, RAR seems to ...
1
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1answer
250 views

How do I install lzip/plzip?

A former developer backed up all of our files using plzip. We no longer have the server he used to compress them and have not been able to find a program to decompress these files. We have Windows 7 ...
0
votes
1answer
268 views

How to create ZIPs with the content of every folder [duplicate]

I have several folders and I need to compress the content of each folder in a separate ZIP file. However, every ZIP should only contain the content of each folder and not the folder itself. The ...
1
vote
1answer
927 views

7zip - compress the contents of each folder in a directory

I basically want to compress each file in each folder, delete the original file and leave the folder uncompressed. I don't want to compress the whole folder, only the contents in it. That, with 7zip ...
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votes
2answers
109 views

How compress the compressed file in unix

Is it possible to compress the file that is already compressed? Example: Given a compressed file such as file.zip, would it be possible to gzip it into another compressed file in UNIX like this: ...
2
votes
1answer
997 views

Chrome data compression proxy for PC

Google Chrome recently introduced data compression proxy which saves bandwith up to %50 in Chrome beta. (https://developers.google.com/chrome/mobile/docs/data-compression) Sadly it is only available ...
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1answer
113 views

How to store many files in one file without using compression

If I have a large set of small files it takes Windows a long time to copy them (say five minutes) due to the overhead per file. If I wrap them up in a container it transfers them much faster (say ...
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1answer
238 views

Compress text file to tar.bz2 format on Ubuntu

How can I convert a sample.txt (uncompressed) file to sample.tar.bz2 format using Ubuntu 10.04 command shell?
0
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1answer
315 views

COMPACT /U command does not decompress large 25GB file

I have a 25GB file that was incorrectly set as NTFS-compressed because the directory where it is had been marked as compressed when it was created. I am trying to decompress it. The file is currently ...
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3answers
263 views

Check if HTTP calls are gzipped

Assuming that I have an application server (Linux) running on port 80, how can I make sure (with tcpdump, I guess) that all incoming requests are gzipped and all responses are gzipped as well? Also, ...