Compression decreases the size of data.

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Windows 7 compressing doesn't reduce space [duplicate]

I used the compression method by windows 7 from the properties of a file but it doesn't seem to work. The folder that was around 42,6 Gb is now 42,5 Gb which means it only saved me 100 MB? Is there ...
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1answer
177 views

Gzip compression on Apache using .htaccess

As per http://gtmetrix.com/enable-gzip-compression.html i'm trying to enable gzip compression on apache webserver adding code mentioned below in .htaccess, but it's not working ; can you please ...
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1answer
102 views

“recompress” a 7z archive inline

I have a rather large (~500GB) 7-zip archive. I originally made it when I had more space available, and did so at rather fast, low-compression settings. Now things are tight, and I'd like to try and ...
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2answers
94 views

How to compress serveral, large, high entropy, but very similar files?

I have several big (as in: bigger than any dictionary, 100s of GBs) files. These files are very high entropy and compress very poorly. However these files are (as far as i can tell) almost completely ...
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54 views

Incorrect size of image file made with dd and gzip?

In the past I made a backup of a partially full partition with dd if=/dev/sda1 | gzip -5 > file.gz. Some time later, when a free space on partition was smaller I made an image file again with the ...
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4answers
51 views

Why isn't it possible to Encrypt and Compress a Folder on Windows?

I read this blog which explains why this isn't possible but I can't seem to figure out the reason. I find the blog a little difficult to understand. Can someone please explain why it's not possible ...
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2answers
86 views

How to know the compression level of a PNG file and whether it is lossy?

Can I know whether a PNG file was compressed and how (at least, whether it was a lossless compression) in Windows? When I open the standard file properties dialog from the Windows Explorer, I see no ...
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2answers
309 views

What was the SquashFS compression method?

I've got some SquashFS files, and I'd like to know how they were compressed so that I can have a rough idea of how they would perform when mounted. The only binaries provided by the squashfs-tools ...
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1answer
38 views

Decompress files in subfolders to the same subfolder using 7-Zip

I have a set of subfolders with .gz files buried in them. I need to decompress the files and keep the directory structure the same. I have used for /f "usebackq" %i in (`dir *.gz /s/b`) do 7za x %i ...
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2answers
300 views

How can I list the contents of an lrzip file without extracting from the Linux terminal?

How can I list the contents of a lrzip file created via lrztar without extracting it?
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1answer
160 views

Excel conditional drop down lists causing massive file size

I have an excel file which relies heavily on data validation. There are about 20 drop down lists per row. One column has a 35 formatting conditions. One column is a conditional drop down list (using ...
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1answer
50 views

How to recursively compress subdirectory's files with password

I need to recursively compress subdirectory's files with password and then delete the uncompressed file in bash file. There are zip files and other files. I don't want to compress zip files again. I ...
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1answer
236 views

Does unzipping a file on a remote server download the files back to my local?

I need to copy a high number of files to a remote windows server. I am connecting to it via VPN and then browsing to the remote folder in Windows Explorer. Problem is uploading is really slow, ...
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0answers
82 views

How to create a highly compress self extracting archive with 7zip or winrar?

I have downloaded a highly compressed call of duty modern warfare highly compressed 99 mb self extracting 7 zip archive .after extraction it becomes 6.35 gb how they compressed these things .i know ...
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1answer
92 views

Losing storage space on Windows 8.1 by compressing and decompressing the disk [duplicate]

At first I thought if I compress the disk, then I would get extra space. However, after doing the compression I lost 2.5GB. Then, I decompress the whole disk to regain the lost 2.5GB but I lost 1GB ...
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1answer
251 views

I can't get compress.exe to produce anything

I'm trying to emulate the Windows Send to/Compressed (zipped) folder function using the Microsoft tool compress.exe, included as part of the Windows Server 2003 Resource Kit. It might not be possible ...
2
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1answer
83 views

PNG or JPEG for an X-Ray without visible artifacts

A past paper question from a Multimedia Systems exam: If you had an X-Ray photograph of a leg which might be broken, which would give better compression before artifacts were visible, and which ...
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1answer
530 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. ...
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3answers
43 views

Is it better to compress all data or compressed directories?

I'm archiving some projects, let's say each of them has own directory: projects |- project-1 |- project-2 |- project-3 I started compressing them as following: ==== SITUATION 1 ==== projects ...
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2answers
131 views

Container with in-built compression, which automatically adjust its size

I try to find an efficient way of rsyncing contents of an ext4 file system as a part of a regular backup, yet I consider a decent compression and a minimal required space. I can just use plain rsync ...
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0answers
567 views

Uncompressing files, compact'ed on Windows 10

I'm testing Windows 10 and one very interesting thing I found is new switches for compact: Displays or alters the compression of files on NTFS partitions. COMPACT [/C | /U] [/S[:dir]] [/A] [/I] [/F] ...
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1answer
558 views

ffmpeg: Highest quality 50i to 50p conversion, comparable to Adobe Premiere

I have 50i footage (more specifically tagged as 25 fps but does contain movement on the secondary fields). I am able to get pretty good quality conversion to 50p from Adobe Premiere by simply ...
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193 views

“Size on disk” column missing in Windows Explorer?

I decided to use the "compress this drive to save space" option on my backup drive, which simply houses a Windows Server Backup. I learned that when viewing file properies for files on a drive using ...
2
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1answer
287 views

Batch command to archive folders with content using WinRaR

I have lot of folders in the root "C:\Test\Archiv\" (more than 1000). To be more specific, I get one every hour. They are named as following : ay %year% m %month% d %day% h%hour% In each folders are ...
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611 views

7zip - Command Line: how to set output path?

I want to compress all HTM files in D:\HTM\ to an archive called comp.7z which is created in D:\HTM\ directory, so I do the following: 7z a -o "D:\HTM" comp.7z "D:\HTM" and get an error, exactly as ...
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48 views

Winrar self extracting SFX fail to launch

I created an SFX file (to unzip and launch a program directly) with Winrar which is supposed to be installed in a TEMP folder. I specified to launch "bin/myprogram.exe" after extraction. When I ...
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1answer
415 views

Winrar command line compression ratio

I have a Winrar command line that look like this: "c:\Program Files\WinRAR\WinRAR.exe" a -afrar -s -m5 "e:\output.rar" "e:\foldertozip" The folder that I am compress by default is 9.08MB. The ...
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54 views

How can compressed archives like .RAR be repaired?

I'm interested to know how WinRAR and 7-zip repairs archives but unfortunately I couldn't find any description about this process.So I'm here to ask: How does WinRAR or 7-zip repairing process work? ...
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2answers
165 views

How to create a zip file with files in FAT format on Linux

I have to create a zip file (with no compression). I want the files in the zip to be in FAT format. That is, If i use zipinfo command, I should get the following: ... -rw-a-- 2.0 fat ...
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1answer
46 views

accessing files directly from SFX archive

Similar questions have been asked on this forum, but not identical, so I am sorry if this is a bit redundant. I have made a "portable" application. I used WINRar to create an SFX self-extracting ...
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54 views

Why does performing OCR in Adobe create a much larger document?

I'm using Adobe Acrobat Pro XI on Macintosh OS X Yosemite and I've noticed that doing OCR sometimes creates a much larger document. For example, I scanned a four page document and got a 458K ...
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1answer
73 views

Slight file content difference due to LZW compression

In order to test if LZW compression is truly lossless I did the following: I created a master uncompressed TIFF file. Created an LZW compressed version of it Saved that compressed TIFF back into an ...
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270 views

Stop Compression: Google Drive Videos?

Is it possible to stop the compression of Google Drive videos? I uploaded an 18.4MB video in mp4, that was already compressed, and google drive added further compression, resulting in a block effect ...
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98 views

Set maximum size of zip/7z archive

I have multiple files that I would like to pack into archives of no more than 100MB. The only option I could find was to split the archive into volumes, but what I want is standalone archives that can ...
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30 views

wget only new or updated files when the source files are compressed but the destination files are uncompressed

I would like to know how to wget files from a url which are stored with bz2 compression. However, I would like to only wget the new and updated files, relative to my destination, where the files are ...
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2answers
68 views

Compressing a lot of similar JPEG images

I have a lot of—hundreds of thousands—JPEG images, and most of them are very similar to each other. While they aren’t of high quality and take about 100+ kB each, this adds up to a lot of storage. Are ...
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1answer
34 views

Inflate multi-file zip files in linux

I just downloaded some zip files that were splited. (The dreamplug rootfs files to be precise). They are called rootfs_dreamplug_v10_Aug-28-20128.zip.001 rootfs_dreamplug_v10_Aug-28-20128.zip.002 ...
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1answer
84 views

Why does 7-Zip's compression speed lower over time?

I'm busy backing up my local server files, which amounts to just under 4GB of data in ~295000 files. I selected 7z as the format, and set the level to Store. The process started pretty quickly, but ...
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1answer
396 views

Difference between pixz and xz with -T option

I'm trying to compress a 100GB with a good ratio, so I decided to use xz. I don't need it to be very fast, but since I have an 8-threads CPU, I was wondering how to take advantage of them. I found ...
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39 views

How to execute tar and compress command on Folder in single step

i am trying to execute shell script with two command as parameter Shell script : #!/bin/bash a=$1 b=$2 `$a | $b` Input : "tar -cf DIR.tar DIR" "compress DIR.tar" Objective : create ...
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2answers
2k views

Is it possible to compress a full file system on Linux?

On Windows I can use NTFS drive compression to save heaps of disk space; usually 30%, often much more. It also improves read and write speeds at the cost of higher CPU usage; which isn’t an argument ...
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1answer
198 views

lighttpd complains about ssl.use-compression

I am trying to apply some of the tricks described here, and the problem is having ssl.use-compression = "disable" in lighttpd.conf, because server reports WARNING: unknown config-key: ...
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2answers
236 views

What files can I safely enable NTFS compression for on Windows 7/8 USB bootable drive?

The title says it all. I am just a few MB short of copying the needed files to a USB flash drive I intend to use for installing Windows. I have marked the partition as active. I was wondering if I can ...
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1answer
43 views

Does specifying the compression engine to tar directly actually use less intermediate disk space than tarring first and then compressing?

When I use tar to archive a directory and then compress it separately using e.g. xz, there will be a point where I have three files on my system - dir, dir.tar and dir.tar.xz. As soon as the ...
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1answer
72 views

What is the most common archive file format to have mountable, readable/searchable archives?

I make periodic backups of my data, resulting in large chunks of files. Currently I copy them into different directories on a share on a NAS (plus an external HDD), indicating the date in the ...
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1answer
173 views

Disk space usage in large folders with over one million files

I have a NTFS-compressed folder containing one to two million small (~25KB) text files. Recently, I noticed that far more space was being consumed than would be expected. Digging deeper revealed that ...
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1answer
313 views

dd , pv , gzip and exclude directory, possible?

Is it possible to do the following: dd if=/dev/hdx | pv | gzip > /path/to/image.img\ --exclude=/temp --exclude=/lost+found --exclude=/proc --exclude=/path/to/image.img So I want to make a backup ...
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2answers
98 views

How to tell of a GZip file is still being written while being copied

I am getting a gzip file in a path. Input Folder Path: <server>/input_gate I want to check whether the GZIP file I am getting in this folder are valid? I have used the following command. It ...
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2answers
152 views

Why don't iPhone or iPad compress the video they record? [closed]

I just recorded 30mins of video on an iPad (1080p, of course) and it took up close to 5Gb. So my question: is it really so hard to do on-the-fly compression? Surely that's what those multi-core CPUs ...
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1answer
875 views

Should Windows 8 be taking up 40GB of my HDD when my drive is compressed?

I want to install a game that requires 12GB on my computer with an HDD that shows 53GB total capacity, so I cleared everything off of it. All documents, pictures, downloads, desktop, etc empty ...