Compression decreases the size of data.

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15 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
28 views

Which lossless image codec can achieve the highest compression ratio on photographs of buildings?

I was wondering which lossless image codec is best for compressing photographs* if we only care about final file size? * scanned negativs specifically Additionally does it make a difference if the ...
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2answers
27 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
21 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
23 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
25 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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19 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
31 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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What is diff. b/w IBM MXT (memory expansion technology) & AME (active memory expansion)

I saw two memory compression techniques from IBM, one is MXT (here) and another is AME (here and here). Can someone please tell if they are different and if so, what is the difference. Thanks.
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1answer
35 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 ...
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1answer
31 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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33 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
29 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
56 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
47 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
71 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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23 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 ...
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1answer
36 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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1answer
46 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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1answer
18 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
40 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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1answer
35 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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34 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
25 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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23 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
63 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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29 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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21 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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20 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
59 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
18 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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30 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
118 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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17 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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125 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
35 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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64 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
23 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
43 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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0answers
40 views

How to disable mod_deflate in a subdirectoy using htaccess

I have a site that mod_deflate and gzip breaks a script in a subdirectoy. I am on a shared host. Is it possible to use compression on the root level and disable it on a specific subdirectory using ...
0
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1answer
71 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
84 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
39 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
48 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
181 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 ...
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69 views

restoring files after doing rsync with compression

I understand that you can rsync with arg -z and -a for compress and archive. Can someone tell me with these options, does it affect the files being backed up in any way if ever they need to be ...
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1answer
38 views

Why this scanned book image has no background?

If you save this image on your desktop, you see it's background color as your desktop color. If you open it with Adobe Photoshop, its background id checkered which means it has no background. It's ...
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2answers
25 views

Should I archive old folders

I have many folders on my hard drives that contain many media files and logs for old websites I have created for clients that I rarely ever access now. I want to know aside from compressing them what ...
0
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1answer
31 views

Uncompress bz2 file from command line on Windows

Is there any tool in the Windows command line that allows me to do this? Otherwise, is there any light and portable application that will allow me to? Related question, can I rename .bz2 extension to ...
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1answer
54 views

Does copying files via MTP over USB compress them?

I'm trying to backup my phone to a computer running Ubuntu 14.04 LTS, and I noticed that one of my backup images looked noticeably more pixelated, even when viewed at the same size as my phone screen. ...