Compression decreases the size of data.

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140 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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385 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 ...
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301 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 ...
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10 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 ...
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26 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 ...
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24 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 ...
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36 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 ...
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89 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 ...
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16 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. ...
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81 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 ...
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26 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?
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127 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 ...
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66 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 ...
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174 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 ...
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229 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 ...
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91 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 ...
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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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231 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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1k 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: ...
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658 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 ...
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40 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 ...
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169 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 ...
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693 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".
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96 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 ...
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72 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 ...
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197 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 ...
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341 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, ...
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10 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 ...
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9 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 ...
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29 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 ...
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10 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 ...
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19 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 ...
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16 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 ...
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37 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 ...
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24 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 ...
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32 views

Windows compact /s /u command runs forever on deep directories greater than MAX_PATH

I ran the command compact /U /S /I /Q > status.txt on a large deep directory and after it ran for over 24 hours I decided to investigate whether it was hanging. It turned out that meanwhile the ...
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39 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, ...
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29 views

Change the default image compression in Photoshop Elements 11

I have a lot (200+) of jPegs that I need to crop and then save. I'm using Elements, so recording an Action is out. The approach I'm using is to edit a bunch of images, then Close All and use the ...
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51 views

Apply binary patch to linux kernel image

I have a kernel image. The sources are somewhat lost and I dont want to migrate to a recent version (embeded software, custom (patched) linux kernel 2.4.24). I want to make a simple operation: ...
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20 views

How to compress subfolders and subfiles, in case when parent folders are already compressed?

Windows allows to comress folders. When setting some folder to comressed, there is an option to compress subfolders and files. Unfortunately, the process can take a lot of time and can either skip ...
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46 views

Dolby Digital Live vs DTS Connect Analysis

Has anyone perfomed a proper analysis of these two? As in compressed a lossless source with each, decoded it and compared the output bit for bit to the original? I'm unable to make out any difference ...
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36 views

ASUS RT-N65U router displays ridiculously fast internet speeds

My router's logging some ridiculous internet speeds. For example, here's a screenshot showing a max internet of speed 16.7 Gbps, and an average speed of 111 Mbps. I did complete a large download ...
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60 views

Error uncompressing file when piping curl to gunzip

I need to download a gzipped xml feed to parse in my Ruby app. It may well be quite large, 30Mb compressed, 300Mb uncompressed. So I do this: curl -s http://example.com/file.xml.gz | gunzip and read ...
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21 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 ...
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0answers
77 views

Achieve mp4(x264) compression of Debut Video Capture in Sony Vegas

I am using Debut Video Capture software to record my screen (948x534px in mp4 h264 encoder with Ratefactor of 28) and afterwards I edit those clips and render then in Sony Vegas. My problem is that ...
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52 views

Unzip speed on Mac versus Linux

I have a zip file that contains 200mb of data, compressed to an 80mb .ZIP file. Basically it's a website with thousands of files, including code and images, no video. The file was zipped on a linux ...
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205 views

Stream videos from a server with “youtube-like” compression

I would like to host some videos on a site for a small audience (under 50 people), and don't want to use a site like YouTube or Vimeo, however I would like to have the same kind of load speeds for the ...
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0answers
19 views

Windows compressing big file automatically

I have a NTFS shared partition (for my Fedora and Windows 8 installations) and a big truecrypt container on it (not the whole partition). I have no problem mounting this container from Linux, but ...
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37 views

How do I join, decrypt and uncompress my backups?

This is the line I used to back up some files for f in "*"; do tar -ch "$f" | pv | xz -9 -v |openssl des3 -salt -k “mypassword” | split -a 4 -b 200m – “/backups_${f%}.tar.xz_” ; done Now I am ...
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0answers
88 views

New versions of srep failing my compression algorithm

I am currently using freearc, precomp042 and srep 3.2 (32bit) I am running on Windows 7 SP1 x64 with 8GB RAM I use 4 regular compressions styles as noted below depending on data type and have no ...