Compression decreases the size of data.

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3
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1answer
85 views

Is there any solution/utilities to compress and upload a large file simultenously?

Upload a large file via broadband connection takes time. Compress the file using max. compression ratio before upload also consume time. Is there any solution that may compress and upload file to ...
0
votes
1answer
23 views

Compressing with BarCat?

I'm having an issue using Barcat to show a dialog while compressing? Wondering what the exact syntax is? here's a link to Barcat things I've tried are bar -n apache24.tar.xz |tar -Jcf - bar -n ...
1
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0answers
193 views

Improve slow NAS Ethernet transfer speeds: On-The-Fly Ethernet Compression with SAMBA?

Hardware: Pogoplug E02 (ARMv5te, Marvell Kirkwood 1.2GHz, 256m RAM) Software: ArchLinux, MDADM RAID 5 array, Ext4, SAMBA server This setup delivers file transfers to my Windows clients at ~21MB/s ...
0
votes
2answers
584 views

How can I achieve the maximum zip compression? [closed]

I would like to make a "standard" zip file which contain .jpg images. Which software and switches / options should I use to achieve the maximum compression ratio? I mean maybe I can make a solid ...
1
vote
0answers
184 views

Compress 1 TB file collection into standalone archives each size no more than 2GB

I have about 1TB data stored in two drives and I need to compress and encrypt them into independent archives each size must be smaller than 2GB. Exception may be files that are larger than 2GB. Is ...
1
vote
2answers
683 views

NTFS compressed folders: is it possible to tweak compression ratio?

As it seems, Windows compresses the NTFS compressed folders with the lowest compression ratio possible. While this maybe good for increasing speed and decreasing CPU load, for the files that are ...
0
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0answers
60 views

Tape backup with compression

I would like to backup a NAS to a series of LT02 tapes, (200 gigs uncompressed, 400gigs compressed.) There are about 700 gigs of data to back up. I initially tried cpio, first trying to set hardware ...
2
votes
2answers
13k views

What is the difference between rar and RAR5 compression?

What is the difference between rar and RAR5 compression ? Which is better for which purpose vs the compression time.
0
votes
1answer
1k views

Recursively process zip archives to extract files while discarding specific format of files

On my Windows 7 machine, I have a directory full of downloaded dumps in ZIP archives. Each archive contains few text files, PDFs and rarely XML files. I want to extract all the contents of each ZIP ...
0
votes
1answer
132 views

How to have zpaq extract files to stdout

I have some log files compressed with ZPAQ that I do not want to extract to disk every time I need to go grep-ing for events. Would like to extact to stdout so I can handle the output the same way as ...
0
votes
2answers
99 views

I cannot open folders in .tar file

I've downloaded factory image for my Nexus4 mobile, the Image folder is compressed in .tar file but it tells me that its unknown file Type: File ,, how can i open it? here take some photo of my ...
6
votes
3answers
281 views

When putting two identical files in a .zip, they take 2x space, can this be avoided

Say that you have a file you want to put in a .zip archive: zip a1.zip foo.dll My test .dll file is ~10MB, and the archive turns out to be 3.5MB Then you create a file with the exact same ...
0
votes
1answer
60 views

How can I compress a series of integers?

BARF2 (Better Archiver with Recursive Functionality) generates a huge barf2.count file, which is a number-only file. What's the best way to compress that?
0
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0answers
24 views

Why would my zipped file be the same size as the uncompressed files? [duplicate]

I am trying to zip 13 mp4s. The uncompressed versions of those files are 2.69GB. But when I zip them with 7zip, using Ultra compression level and any of the compression methods - including LZMA, the ...
0
votes
3answers
106 views

Zero sized tar.gz file found inside a tar.gz file

My current directory contains a single file like this- $ls -l -rw-r--r-- 1 root staff 8 May 28 09:10 pavan Now, I want to tar and gzip this file like $tar -cvf - * ...
0
votes
3answers
758 views

How big is an 800x600 image file in PNG? [closed]

How big is an 800x600 image file supposed to be in PNG? Actually what I would really like is a table that shows resolutions on the y-axis and formats/compression type on the x-axis. I ask this because ...
0
votes
1answer
54 views

Should I extract before running?

Is it not wise to run an executable from a zipped file without extracting first? Someone explained to me that there is no need to extract first. He explained that zipped files are nothing more than ...
0
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0answers
52 views

image drive with safecopy and compress the output

I am trying to image a drive with SafeCopy and compress the output file on the fly so that it won't take up way too much space. (aka 500GB > 50GB) Will this command work? sudo safecopy --stage1 ...
0
votes
1answer
1k views

How to compress 14 GB of csv files with 7zip (minimizing space)?

I have to compress 14 GB of csv files with 7zip. What options should I use to achieve the highest compression? I have tried Ultra Level with both LZMA and PPMd compression method, obtaining results ...
0
votes
0answers
60 views

Fast way to forward an Outlook email as a zip

I need to find a quick way to select an email in Outlook 2010 and forward the email as a zip attachment. The recipient will always be the same. The subject and body of the email will always be the ...
1
vote
0answers
699 views

Difference between downscaling 1080p to 720p in real time and downscaling during encoding?

Suppose a high quality, uncompressed video is re-encoded twice, with almost identical encoding settings at a relatively low bitrate of 4mbps, but at different resolutions, first at 1080p, and then at ...
1
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0answers
64 views

Webm video flashes compression artefacts

Doing som testing on capturing video from VirtualBox for a screencasting project. VirtualBox uses webm for video and it works sort of OK. However, it has "flashes" of heavy compression artefacts. ...
-1
votes
2answers
110 views

Do web browsers download faster than your max bandwidth?

Since content is compressed on transmission and uncompressed on the browser, does that make the transfer rate faster than your bandwidth? Or is there another term for this? For example, a 1GB white ...
0
votes
1answer
32 views

Below what network speed should I be using compression for an rsync transfer?

I'm transferring some files from a remote server. The speeds for the transfer are abysmal (~1 MBps), and have got me thinking about optimizing the transfer for speed. At what network speed does it ...
1
vote
1answer
559 views

Need to read a Windows 98 DRVSPACE.000 file in Windows 7

Today I came across a DRVSPACE.000 file in my archives and I want to recovers its contents. Beside the file is a READTHIS.TXT which reads: This disk was compressed using DriveSpace 3, which ...
2
votes
1answer
947 views

tar: Cannot create symlink : File exists

I backup lots of gigebytes files in to myproject.tar.gz, and compress success without errors. Now, I want to decompress all to an folder "myprojects". adan@adan-Latitude-D630:~$ tar zxf ...
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0answers
64 views

Safe to convert OS in .uif to .iso?

I'm being sent Windows 7 in a .uif format. Is it okay to convert it to .iso so it can be installed from a USB? If so, what is the best way to do that?
0
votes
0answers
116 views

How can I list all files recursively that have the compressed attribute set?

I started a decompress operation using compact /U /S /I /Q > compact-report.txt on a large dir (120GB+, ~950M+ files) and it has been going on for about 24 hours now. Most files seem decompressed, ...
5
votes
1answer
780 views

Change Excel Zip Compression Level in Windows

Excel compresses its files using Zip-Deflate and stores it. However, the compression level is far from the best. To reduce the size and send it across I have to unzip and re-zip it manually everytime. ...
0
votes
1answer
46 views

Move data with compression

I'm using win 7.I have disk ~2Tb which one I want to format so I need to move data from it to other disk, but the problem is that I have not another 2Tb disk and I think I can compress data(on the ...
2
votes
3answers
338 views

Do more compressed PNG images take longer to load?

When I create PNG files with very small disk size, I tend to wonder if the file size becomes less important than the time viewers would need to decompress the image. Technically that would be trivial ...
1
vote
1answer
600 views

Converting a scanned pdf to a compressed PDF with binary (2 level) image

I have many old scanned PDFs which take up too much space on disk. I have tried many PDF compressors available on the web. All of them ask me what compression to use for color images, and what to ...
0
votes
2answers
190 views

Check if a compressed file is password protected before downloading

Everything is in the title: I'm aiming to download a big file, and I don't want to waste time downloading it because I don't know if it's password protected or not, especially with my slow internet ...
3
votes
2answers
1k views

How can I search for files that are either compressed or uncompressed in Windows Explorer?

I know that Windows explorer can colorize the NTFS compression state of a file, in both the regular and search views. How can I specifically filter/search for files that are compressed or ...
12
votes
2answers
669 views

Compressing many similar big files

I have hundreds of similar big files (30 megabyte each) which I want to compress. Every pair of files have 99% of same data (less then 1% difference), so I expect to have not more than 40-50 megabyte ...
2
votes
2answers
309 views

How to extract tar file on Windows, when the filenames include a colon?

I have a tar(.gz) file created on a Linux system, and the filenames contain colon characters. The tar utilities I can find on Windows don't extract these files at all. How can I do this, ideally ...
0
votes
1answer
450 views

Is possible to compress ALL the web browsing using a ssh tunnel or similar?

I have a machine with a fast connection to internet in point A (Let's say 10MB). In point B I have a machine with slow internet (let's say 1/2 MB). Is possible to use a ssh tunnel that run in point ...
0
votes
1answer
78 views

How do I test if my SSD uses compression?

I am thinking of running the filesystem with btrfs on my SSD. This might make the disk last longer or run faster, because if we compress the filesystem there is less to write. (I understand this is ...
1
vote
1answer
392 views

How to keep EXIF data in a DSLR video after editing / compressing with Photoshop CC?

So I have a bunch of home video files with my kids and family. I want to do some edits like text overlay, music backgrounds etc and also compress them using Photoshop CC. However, after compressing or ...
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vote
0answers
405 views

Why does FFmpeg append blank black video to the end of my MP4 files when compressed from MOV?

I have several large MOV files that I want to compress to MP4. Unfortunately, when I use FFmpeg, it appends lots of black (blank) video at the end. (The destination file is longer than the source ...
0
votes
1answer
925 views

Windows : Compress the drive/file/folder to save disk space [closed]

This option is available for both my primary as well as external hard disk. I was wondering about the pros and cons of this feature. I found some at ...
0
votes
0answers
31 views

While compressing the folder many other zip files creating during the process

I seen a strange thing never seen before while compressing the folder into the zip. When I start zipping my folder there are many zip files showing automatically during the process. Like say the ...
1
vote
4answers
519 views

Does 7zip compression level affect decompression speed?

I have a directory that I would like to password protect and encrypt. I am using PeaZip to do this using 7zip compression. I'd like to use the 7z like a directory and hard drive space is not a ...
0
votes
1answer
117 views

Push format of image while paste from clipboard

Problem: email client (theBat!) is using jpg for all images from clipboard. I need to use png or gif instead. For now I can only save image to disk in needed format and insert through menu - very ...
0
votes
2answers
405 views

Where do I find the “send to” Compressed (Zipped) folder

I am trying to compress a Zip archive to an external hard drive on my PC. Space is limited on the system so I can't compress it locally. I have access to WinZip but can't download or install any ...
0
votes
1answer
39 views

How to use pv to see decompression progress?

I've seen: How to use Pipe Viewer (pv) for measuring compression progress? Is there a way to do the same thing for decompressing a gzipped file?
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vote
0answers
95 views

Re-zip archives with the compression level “No Compression”

I am running Windows 8.1 Enterprise x64. I have a folder containing hundreds of ZIP archives (aka Compressed folders). I need the fastest way to convert them (preferably, in-place) to vaild ZIP ...
2
votes
1answer
114 views

Windows 8 - Compress Drive did not continue after cancel/reboot

I checked the "Compress Drive" option on an external drive (1TB) on Windows 8. After clicking OK, the OS started to compress the files folder by folder on the drive. As it took too long, I shutdown ...
4
votes
2answers
233 views

How can I specify the order files should be compressed in 7zip?

I have a set of files I would like to compress that I know to be repetitive and compressible, but 7zip chooses a non-optimal order to compress the files and fails to take advantage of their ...
1
vote
3answers
5k views

How to extract multipart rar with missing parts?

I have a multipart .rar archive containing a single .tar.gz file inside it (don't ask why, that is just how it was made). I am missing a few of the parts, but do have the first part. I would like to ...