Compression decreases the size of data.

learn more… | top users | synonyms (1)

3
votes
0answers
43 views

Compressed file with a header containing all files within it, at the beginning of the file

I have noticed that most files resulting from a compression / archive process do not have a list of the files contained at the beginning of the resulting file, but rather at the end of it. For ...
2
votes
0answers
622 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 ...
2
votes
0answers
474 views

Gifsicle: How to set it to not overwrite the original GIF file if the resulting modified GIF file is larger than the original?

About Gifsicle: Gifsicle is a command-line tool for creating, editing, and getting information about GIF images and animations. One of its features is (from its website): Optimize your ...
2
votes
0answers
342 views

Does a smaller cluster size increase the ratio of NTFS compression?

I read that NTFS compression needs a partition formatted with an allocation unit size <= 4KB. Could a smaller cluster size of a partition give more compression and lessen wasted space? For ...
1
vote
0answers
9 views

General-purpose program for RLE compression

We have to deal with very large columnar files with fixed-size data and lots of padding bytes coming from mainframe. I would like to evaluate different compression techniques and their impact on ...
1
vote
0answers
33 views

Pacmd dynamic range compression Ubuntu 14.04

I used the answer at the link below to successfully set Dynamic Range Compression on my Ubuntu media box running Ubuntu 14.04 (SteamOS session, so no Ubuntu desktop session available). Realtime sound ...
1
vote
0answers
54 views

Why do IPSec VPN Compression and Windows Remote Desktop not work together?

I just discovered a strange problem. I connect to a remote network via VPN. Within this VPN is a separate Microsoft Small Business Server (which does not provide the VPN, another device does this). So ...
1
vote
0answers
33 views

Store disc images on a hard drive

I'm cleaning up around my computer (A Win7 ultimate machine), and part of my plan is to rip all my program CDs and store them on a dedicated 1TB hard drive. My initial plan was to simply dump the ...
1
vote
0answers
107 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 ...
1
vote
0answers
82 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
0answers
448 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
vote
0answers
44 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
vote
0answers
233 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 ...
1
vote
0answers
41 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?
1
vote
0answers
262 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 ...
1
vote
0answers
77 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 ...
1
vote
0answers
313 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 ...
1
vote
0answers
423 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 ...
1
vote
0answers
111 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 ...
1
vote
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 ...
1
vote
0answers
287 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 ...
1
vote
0answers
2k views

“extra bytes at beginning or within zipfile,” won't open file

I have an 8.3 gig zip containing tons of telescope observation data, but I can't extract no matter what I try. I've tried Archive Manager, unzip, and tried this guy's fix: ...
1
vote
0answers
983 views

How to verify 7zip'd files integrity

For some files I have compressed, I have been looking for a MD5 add-on to 7zip (As I have the MD5's by way of an Explorer Column Handler, in xplorer2); or a CRC Explorer Column Handler (Because 7Zip ...
1
vote
0answers
44 views

Archive / compression formats or tools which support multiple file forks or streams?

Lately I've become interested in the ability of several filesystems including Apple's HFS+ and Microsoft's NTFS which support two or more data streams. In Mac terminology these were most widely ...
1
vote
0answers
176 views

How to unpack a compressed executable without knowing the compression algorithm

I'm not sure if this question was asked. I searched for it and could not find it. How can I unpack a compressed executable without knowing what compression algorithm was used to compress it? For ...
1
vote
0answers
778 views

Set .png default compression in Photoshop CS6

Is there a possibility to set .png default compression options to "NONE / fast"? Whenever I try to save as .png, the default option is set to "smallest / slow".
1
vote
0answers
108 views

Extracting a tar file containing files with Chinese names will make the filenames illegible

On my Mac OS 10.6.8 I had a directory full of files that had Chinese filenames. I proceeded to run tar czf mydir.tar.gz mydir Now when I untar it with tar xzf mydir.tar.gz, the extracted filenames ...
1
vote
0answers
80 views

IIS vs httpZip (or other product) Compression

We're currently comparing httpZip compression software. Has anyone used this and can offer a comparison between that product and IIS? Is there a big savings for httpZip over IIS? If you aren't ...
1
vote
0answers
232 views

Compress files on Windows Server 2003

Duplicate Questions How to compress files with batch file? Using compact.exe didn't do what I wanted. I'd like to have an archive file created so that the files can be retrieved. This is ...
1
vote
0answers
354 views

Video compression artifacts in Flash

This only started happening in the past two days, which seems very odd to me. Everything worked flawlessly up until now, and I use my my computer as my primary TV. Flash video from Hulu and Amazon, ...
0
votes
0answers
6 views

SASS e images not loaded

I have used webasset and cssmin on a python static site generator to merge 4 css files into a one compressed file. The individual CSS files when referenced individually does contribute to a fully ...
0
votes
0answers
16 views

LZA Compressor Directory

I am trying to use LZA to compress my directories (No sub folders) Whenever I use it however it automatically creates the archive within an additional folder! Example: I am using a folder called ...
0
votes
0answers
18 views

How to modify files within mszip (cab) executable?

I can list and extract certain executable contents using 7z. It seems to be using standard compression methods. Path = test.exe Type = Cab Method = MSZip How can I modify files inside that ...
0
votes
0answers
54 views

How do I access gzip-compressed data from a PowerShell Invoke-WebRequest command, when the “Accept-Encoding: gzip” header is set?

I'm learning about response compression in IIS and I'm testing my configuration with various tools. It appears that several of these tools either auto-decompress the response, or always send the ...
0
votes
0answers
33 views

Linux equivalent settings for 7zip

I'd like to use the same settings as below (Win7) on Linux to compress files, but I fail to get equal compression results, for which I blame myself not correctly using 7za. So far, I have 7za a ...
0
votes
0answers
30 views

Changes in level of compression between different versions?

I used the save function with xz compression as in save(a, b, file = "c.RData", compress="xz") This produced a file of different size on my disk (11589212 vs. 1162284 bytes) switching from R.3.1.1 ...
0
votes
0answers
24 views

Is there an alternative to httpfs2 to mount web urls in Linux?

Currently I use httpfs2 to mount direct web urls in the filesystem. For example a rar archive which has to be decompressed, but I don't have enough space on my VPS to download AND then decompress the ...
0
votes
0answers
14 views

How to make to identical sized archive parts with rar archiver?

I am trying to compress a file with option -v but I am unable to figure out the byte count to set, yielding two identical sized archive parts (part1,part2). My original file size is: 1068303782 bytes. ...
0
votes
0answers
44 views

True crypt container issue

I had created a true crypt container in my external HDD but stupidly ticked the "compress contents to save disk space" option from file properties. Now when I attempt to mount my container with true ...
0
votes
0answers
16 views

Is there any way to have the `split` utility gzip its output by default?

I'd like to be able to do something like, my_long_running_process_producing_lots_of_output | split --gzip --lines 1000000 - part_ and have this produce things like part_aa.gz part_ab.gz instead ...
0
votes
0answers
19 views

Compressing an OS after some slight changes has yielded massively different results - why?

I am using SUSE Linux on a Virtual Machine through VMWare Workstation. This morning, I zipped up a copy of the folder containing my VM (.vmx, .vmdk, .vmem, single snapshot and all) and sent it to my ...
0
votes
0answers
19 views

Copy image/disk/partition, not necessarily entirely and with compression for image

As my last question was considerated "off-topic", here it is reformulated : I have a 16GB SDCard but I put 4GB image on it and I want to be able to extract&store compressed only the 4GB image ...
0
votes
0answers
23 views

Zpaq does not accept option “method”

I am trying to run the command: box:~/experiment# zpaq a out out.m4v -method 5 This should compress out.m4v to the file out using the method 5 but instead I get the error. -method: No such file ...
0
votes
0answers
92 views

How to NTFS compress the system drive?

As you know, some files cannot be compressed when your system is running. How do I enable compression system-wide then? For every single file? Can I enable it in the recovery console? Ps.: For ...
0
votes
0answers
35 views

Improve seeking precision for wma encoded in ffmpeg

Compressed audio formats (like compressed video) have trouble doing precise seeking. Is there something in the ffmpeg encode settings that I can change to make the resulting audio file allow more ...
0
votes
0answers
47 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 ...
0
votes
0answers
282 views

Cannot complete the compressed folder extraction wizard

Recently my friend archived a folder in linux (Redhat) and uploaded in Google Drive. I have downloaded the .zip file and trying in it to unzip in windows 7. I am receiving following error: Cannot ...
0
votes
0answers
26 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
0answers
50 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 ...
0
votes
0answers
48 views

Sequential Compression of [Text] Files (7zip and Windows)

This is with Windows 7. I have an iterative process, and on each iteration it produces a text file. What I want to do is compress this text file on each iteration to an archive. I'm using vb.net and ...