Compression decreases the size of data.

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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 ...
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68 views

Zipping multiple folders individually

I have a problem zipping multiple folders individually. I saw that you can do that using Winrar. I have managed to do it. But here is the problem: When you extract the archive made by Winrar, it ...
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1answer
57 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
1k 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 ...
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2answers
92 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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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 ...
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1answer
778 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
138 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 ith a smaller one, such as representing a=abc b=def ...
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1k 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
66 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 ...
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1answer
123 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 ...
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128 views

Using hardware compression for webcam in Linux

I have a Logitech C615. I am assuming that if I configure mencoder just right, or perhaps v4l2, mencoder will use the native hardware compression of the web cam, and not try and decode and ...
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140 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 ...
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3answers
800 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 ...
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2answers
213 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 ...
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3answers
154 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. ...
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1answer
99 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
198 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 ...
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0answers
119 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 ...
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1answer
184 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 ...
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1answer
219 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 ...
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0answers
25 views

Search file in compressed files in DOS

How can I search for files in compressed files using DOS? I know I can search for files with the dir command, like this: dir HtmlInputSecret.* /s But I don't think it searches in compressed files, ...
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1answer
655 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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2answers
100 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: ...
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891 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
98 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
185 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?
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254 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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2answers
171 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, ...
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1answer
58 views

Force gpg to use compression?

Odd situation, and I won't go into details about why our present circumstances require it. But, I'm looking for a way to force gpg to use compression. My testing is suggesting that the following ...
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3answers
2k views

Recursively unzip files where they reside, then delete the archives

I goofed up a setting on the backup software I use. Normally I would have the files from a network share get loaded into a spare drive, compressed into zip folders, then sent off to the offsite hub. ...
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1answer
4k views

How does 'dictionary size' affect compression?

I know that higher size may lead to better compression ratio and vice verca. But is there a way I can decide better?.. since there are so many choices So far I've noticed dictionary size ≈ file ...
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2answers
124 views

Size of the compressed image file deteriorates with usage

I have created a VDI file using VirtualBox and need to upload it with compression for other to access. The more I use the virtual machine, the less the compression happens. There is not much of ...
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1answer
973 views

Video compression with ffmpeg - Constant quality

I am trying to compress videos of 10 seconds at different bitrates with ffmpeg. My aim is to obtain the same video at different qualities (from very low to very high). I don't want to touch audio part ...
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361 views

Looking for a way to compress, encrypt, split, and upload data on Linux for backups to multiple clouds

As the title says, I'm looking for a way in Ubuntu/Linux to compress, encrypt, split, and upload data for backups across multiple clouds. I have grabbed multiple cloud accounts for free ranging ...
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1answer
1k views

avconv mkv to mkv with audio compression bug

In order to make quality tests, I would like to compress the audio part (to a low bitrate) of a matroska file without damaging video. Audio codec is AAC and video codec is H264. I am using avconv on ...
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2answers
97 views

How to extract such a compressed file?

I have been asked to extract a ZIP file having in it 3 tar files and each tar file contains around 3000 gz files. I had to extract the main ZIP file first then extract the tar files second then ...
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1answer
299 views

Windows: Automated PDF compression (Hot folder)

In Windows, is there a way to monitor a folder and automatically compress a PDF that is placed in it? (by compression, I mean make a PDF smaller (I.e. not zip it), similar to using the reduce file ...
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62 views

How to compress 2 (apple) disk images of different backups of the same drive?

So I have backed up my Macintosh HD at different instances to DMG files. I would like to compress them but when I try to make an archive it simply compresses each image, without recognizing the ...
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1answer
195 views

Differences between DMG and various Zip-like formats?

For my everyday work, I have a few DMG files that I keep on cloud storage. At the beginning of the day, I download my DMGs, convert them from Compressed to Read/Write using Disk Utility (OSX). At ...
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236 views

Compressing files over the network with WINRAR - read error

I have 3.6 TB of backup files on a NAS that need to stay together (they are a full and a months worth of incrementals - the latter is only useful with the former) - but I need to move them off the NAS ...
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1answer
40 views

What is “crossflow compression”?

I came across the term "crossflow compression" several times while reading about WAN optimization techniques. The only elaboration I've seen is that it refers to "compression across various flows", ...
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2answers
1k views

Zip many files into several archives

Running Linux. I have a directory of around 150 large CSV files; simply doing a zip -9 on them results in a monolithic file that is still too large. I would like it to simply zip them in maybe four or ...
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3answers
143 views

Untar multiple files at once?

I'm on Windows 7 and have a number of .tar files with the following names: .tar-aa .tar-bb .tar-cc ... The tar files contain a large backup directory which is broken up into chunks of 250MBs each. ...
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2answers
125 views

Compress a remote folder in Linux

I'm a Linux newbie and I'm trying to zip a folder which exists on a remote host and export it to another remote host. A quick Google search lead me to tar/gzip and rsync options but I'm not sure how ...
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2answers
207 views

Good way to reduce number of colors in a PDF file?

I have pages of handwritten notes that I decided to scan to a PDF. Somehow, 153 pages of notes turned into a 156.4 MB PDF file. The notes are scanned in color because I used four different colors: ...
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1answer
364 views

Is it possible to recursively list zip file contents with 7 zip without extracting

Similar to this question I have a very large zip file which contains other zip files, folders, and files. I want to use 7-zip to extract a list of file names from it, recursing into subfolders and zip ...
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2answers
178 views

Is there a client impact to server side NTFS compression?

One of a our file servers at work is being compressed with NTFS compression. I've read about it being generally inadvisable on servers. But I've not found anything the states where the ...
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3k views

Compressed (Zipped) Folders no longer extract properly

I actually just finished up cleaning a virus from my computer (took me in total like 20 minutes, no big deal), but I'm almost sure this is what caused the problem. Now, whenever I download a zipfile I ...
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3answers
672 views

powershell create zip from log files

How can I move log files to zip archives with System.IO.Compression.FileSystem in PowerShell? I have more folders with log files per application: app1logfolder |-app1_20130507.log ...