Compression makes files smaller in size, normally done to reserve space, archive old files or to reduce network bandwidth required while transmitting file. A myriad of compression programs exist, each with their own advantages and disadvantages such as: compression ratio, speed of compression, and ...
1
vote
1answer
24 views
Is there a compression method for compressing a group of very similar files, without archiving them?
I want to compress a large nuber of files that have near identical headers, and also some data, however I do not wish to archive them, nor do I wish to zip them individually(because the copression ...
1
vote
1answer
13 views
Batch compress mp3 while retaining file and directory structure to new target
I have a master directory of music which is organised using subdirectories. My new (cheap) MP3 only holds 8GB so I wish to make a reduced version of my music with a lower bitrate.
Is there a free ...
0
votes
0answers
57 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".
0
votes
1answer
101 views
Batch resize and compress PDF files
I need a way to size down and compress batches of PDF files. I'd prefer to do this on Windows, but Linux would be fine if it meant a smoother workflow.
I know that there's programs such as NitroPDF ...
0
votes
5answers
76 views
Zip multiple folders indvidually, automatically
I have folders full of photos within category folders
eg
holidays
spain
france
italy
family
son
daugher
christmas
2010
2011
... except much longer ... there are about 100 folders.
I need ...
0
votes
1answer
107 views
How to extract .arc files
I downloaded a software from the internet which is in .arc format. How can I extract the files on MAC?
The arc file is 4GB, but I believe it will be 30 GB when extracted.
1
vote
1answer
40 views
Guess compressability of a large file
I have a large file (~20 GB) and I want to quickly make an (approximate) estimate of how well it can compress. I want an program which can provide an immediate guess at the compressed filesize, and ...
2
votes
2answers
112 views
20GB+ worth of emails in my /home what is a better solution for that?
My email storage requirements are outgrowing anything reasonable with respect to local mail storage. As we speak 99% of my home partition is filled with personal mail in Thunderbirds mail dirs. ...
0
votes
4answers
48 views
compress big files on linux
I got a several of big files using command
mysql> select * into outfile ...
for example, dump_news.sql, dump_weibo.sql, dump_report.sql ...
The total size is about 7.6G, I use command
tar ...
0
votes
1answer
54 views
Unzip an archive that was split into 2 files
I have 2 zip files that were split using:
zip -r -s 15 my_file.zip my_file.pdf
Now I have 2 files:
my_file.zip
my_file.z01
How can I unzip them?
Doing unzip my_file.zip I get:
Archive: ...
1
vote
3answers
83 views
Losslessly compressing similar images?
I need to reduce the size of my photo library so I naturally want to compress them. Many of them are not quite identical, but still very similar (subsequent shots of the same scene). Is there any ...
1
vote
1answer
63 views
Bloated Excel file
Someone send me an Excel file that's 10MB, and thus causes us email problems. When .zip'ed it goes to under 1MB, so presumably there's something wrong with the Excel sheet but is there any way to ...
0
votes
0answers
47 views
How do I compress system files for which I have been denied access?
I need to compress some files in a folder, but my system denies me access from doing so.
Since they are system files, how can I compress these files without changing the permissions?
I'm looking for ...
1
vote
0answers
38 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 ...
3
votes
2answers
121 views
Optimal lossy compression of images
I have a lot of images/documents, where I want quite a low filesize, without throwing away to much information, or cause generation loss with future compression.
A) Documents, business cards etc ...
0
votes
0answers
17 views
Multithreaded TIFF to PNG conversion
I'm working with images of scanned books, so hundreds of high resolution pictures. I'm doing conversion work with Photoshop Elements - I can quickly save them to uncompressed TIFF, but converting to ...
0
votes
1answer
58 views
Extracting files from NanoZip archive
I have compressed some files with NanoZip on Linux with:
./nz c a -cc file.nz files/*
Now I'm trying to extract them with
./nz x file.nz file_copy/*
but I can't find the output. The same goes ...
2
votes
1answer
52 views
Check level of compression of an image
Is there a unix command to check the level of compression or the compression ratio for an image (png,jpeg,gif)? The mac based mdls command displayed a lot of metadata information, but didn't mention ...
0
votes
1answer
41 views
Skip incompressible files
Is there a compression tool which doesn't attempt to compress incompressible files in order to reduce the compression time? It would need operate on a folder (rather than on a single tar file), and it ...
1
vote
0answers
26 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 ...
0
votes
2answers
171 views
How do I compress my video without compromising it too much
Alright, i'm down to crunch time. I have a video that I have rendered out for something I have to turn in. The submission requires that it be At Most: 200 MB and be one of the following formats:
...
17
votes
3answers
492 views
How does NTFS compression affect performance?
I've heard that NTFS compression can reduce performance due to extra CPU usage, but I've read reports that it may actually increase performance because of reduced disk reads. How exactly does NTFS ...
0
votes
3answers
289 views
Zip files without compression
I'd like to bundle a number of files into a single file, to make them easier to share. The files are already compressed, so I don't need compression, only archiving. How can I put them in a zip file ...
0
votes
2answers
51 views
Compressing Notebook Files
I need to compress and upload a Smart Notebook 10.8 file for uni along with hundreds of other students! Even though the file is only 3.7 MB, I am still having trouble making it smaller. Can you help?
1
vote
0answers
36 views
Quickest way to a minify a SQL file from the command line?
I want to run a single batch command that must take mySQLfile.sql and compress it by minifying it. Any suggestions on how to get mysqldump to produce the most compressed sql file would also be highly ...
0
votes
1answer
123 views
How can I compress a movie to a specific file size in Windows 7's Live Movie Maker?
In previous versions of Windows Movie Maker I could take a raw video file and specify the file size to compress it to, and Movie Maker would compress it accordingly (with the appropriate loss in ...
0
votes
1answer
68 views
pdf compressor on Win 7
I would like to know a preferably free software to compress PDFs on Win 7 so that I can email them. I came across this one, but it requested that I enable User Access Control so I am a bit wary..
...
0
votes
1answer
176 views
Can I compress a RAR file again to reduce its size?
I had a 326 MB iso file that I compressed using WinRAR, with the best compression method. It got compressed to 144 MB.
I want to compress more and want it to be limited to something around 22 MB.
...
1
vote
1answer
134 views
Copying a large number of small text files between two servers over WAN
We have a few thousand small files (2-20KB) to copy between servers in one folder for backup purposes. Currently the process is automated as a cron job and does of SCP copy of each file to the remote ...
0
votes
1answer
30 views
Carve data in RAR archive that was incompletely downloaded
Is it possible to perform data carving the data (contents) of a .RAR archive, in its compressed form?
I cannot uncompress/extract the .rar file because I could not completely download it. I downloaded ...
0
votes
4answers
96 views
Word 2007 file too big
I have this novel I'm formatting. It has 37 images, most of them greyscale. They are all under 100 kb each. Most of them are under 50 kb. So I already know it's NOT the images. It's. Not. The. Images. ...
0
votes
0answers
27 views
Should you archive documents before backing up to the cloud? [closed]
I'm planning to add a cloud storage to my personal backup strategy. But now I wonder if it really is worth the trouble of compressing my documents and photos.
The Open XML-format already have ...
0
votes
1answer
51 views
A good software to compress (archive) files to lesser size at possible [closed]
I'm looking for a software to compress (archive) files to lesser size at possible.
I downloaded an zip file that was 10 MB but after exracting became 1 GB !!! The compression was wonderful.
But I have ...
2
votes
1answer
80 views
Estimating compressed file size using a list parameter
I am currently compressing a list of files from a directory in the following format:
tar -cvjf test_1.tar.gz -T test_1.lst --no-recursion
The above command will compress only those files ...
0
votes
1answer
49 views
perform data carving on unallocated blocks/sectors of NTFS volume
I have used an app called blkls from The Sleuth Kit to extract (copy) (output) the unallocated blocks/sectors of an NTFS volume. By default, with no additional switches/options, blkls will ...
9
votes
5answers
390 views
Fastest GZIP utility
I'm looking for the fastest gzip (or zip) utility. I have a LVM volume which 95% exists out of blank 0's, so compressing that is very easy. I'm looking for the most fastest solution, and don't really ...
2
votes
1answer
35 views
low-pass filter for vector graphics
I have a SVG file which is too large. It contains a lot of fiddly details and I would happily eliminate some of these to simplify the whole file.
With jpeg and other lossy compression formats, you ...
17
votes
3answers
909 views
Can Double Zipping Cause Problems?
I have a directory that I have been storing a ton of files in. Among the 10ish types of files there are also .ZIPs of other directories.
In my personal experience I vaguely remember issues when ...
0
votes
1answer
89 views
“Unexpected end of file” error while uncompressing lzma file
I've got a file called foo.tar.lzma. While trying to decompress it, I get "Unerwartetes Dateiende" ("Unexpected end of file"). I assume I lost quite a lot of bytes, but 1.1 GB are still there.
The ...
0
votes
2answers
154 views
Free .ppt/.pptx compressor? [closed]
I recall back years ago having a good free PowerPoint compressor tool. It would shrink down file sizes, even convert .png embedded images to lesser file formats (i.e. gif at the cost of quality). ...
1
vote
2answers
220 views
BOOTMGR is compressed
So I've just finished messing up my computer beyond repair. I originally had a Windows 7 install on my 64GB SSD and all my data on my 1.5TB HDD. So I decided to install Windows 8 Consumer Preview. I ...
1
vote
2answers
123 views
How do I rar a file into several parts in Linux?
I want to make a rar file(not tar or gzip) with several parts in linux shell, how can do that please?
for example my file is : m.avi - 500mb
I want this :
m.part1.rar 250mb
m.part2.rar 250mb
2
votes
1answer
60 views
Why do Mac apps increase so much in size on 'installation'?
I downloaded VLC 2.0 for Mac. It was a 42 mb download! The corresponding Windows installer is only 21 mb, despite the extra code for the installer itself. But even worse, when I open the VLC dmg, the ...
1
vote
2answers
37 views
Continually compressing a stderr stream
Is there some way to continually compress the output of a program (in almost realtime)?
For example I have this program that produces (a lot of) output to stderr. I want to do something like ...
1
vote
1answer
165 views
How to compress jpg images in Linux
I know that there is 'jpegoptim' to do so. But it not always downsize images as expected. For example if I execute
jpegoptim --max=50 *.jpg
on a 550KB image, the size will not really reduce. So I ...
1
vote
2answers
68 views
What do I do when my boot fails due to compression?
When I start up my computer I get
BAXOS is compressed
Press Ctrl+Alt+Del to restart.
What is this error?
Here are the necessary specifications of my machine:
BIOS: American Megatrends
...
1
vote
5answers
190 views
Any method to batch-compress multiple files?
Does anyone know how multiple files can be GZIP compressed?
I have lots of files in a folder and I need to compress them individually.
Actually, I've found a way to do it. GZIP command line binary ...
1
vote
1answer
121 views
Is there a uncompressed format to PNG?
As we know PNG image format being the lossless format for image files. Compared to lossless audio file formats such as FLAC for example: When I decompress it, I get uncompressed .WAV file format.
So ...
2
votes
2answers
71 views
Modern command line file compression utilities
I am frequently moving large files around from server to server.
UNIXes comes with standard gzip and bzip2 compressors. However, what open options there exist beyond these, especially ones utilizing ...
0
votes
3answers
145 views
Is there better compression than RAR? [closed]
Possible Duplicate:
Compressing with RAR vs ZIP
As many will know, the RAR format produces consistently better results than ZIP. I've used RAR happily for many years and it's really ...
