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Questions tagged [compression]

Compression decreases the size of data.

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0answers
11 views

What length of highly compressed video can I fit in 6mb? [on hold]

With a 6mb attachment file length limit, what length of video of a few people talking can I include? How do I do the compression?
3
votes
2answers
103 views

How do I see and set the NTFS compression attribute in Linux?

Browsing an NTFS partition in Konqueror or Dolphin, the compressed files and folders are not displayed with blue names, and there doesn't seem to be any page in the file properties dialog to see or ...
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0answers
24 views

What is the fastest method to pack an archive that is the slowest to unpack? [closed]

Disregarding all the fuzz about the fastest compression/decompression methods, what is the fastest method to pack an archive that is the slowest to unpack? I was thinking iteratively shifting all ...
2
votes
3answers
58 views

Is there a USB file copy protocol that makes zip file copy faster?

I apologise that I cannot provide any source other than mentioning a quote from my friend. (This is almost a question for skeptics.stackexchange) He said there is a protocol because of which copying a ...
1
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0answers
13 views

LTO-6 with Hardware Encryption Enabled using LTFS File System Possible on HP Ultrium?

I've googled this issue, but can't seem to find an answer to point me in the right direction - or if this simply is not possible. My HP Ultrium LTO-6 Drive supports AES-256 Hardware Encryption as ...
1
vote
1answer
33 views

Can Files Be Compressed Without Changing Extension?

It's common for web servers to pre-compress their files with brotli or gzip. And they do so without changing the extensions of the files. Is their a way to do this in a typical desktop environment (ex....
0
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0answers
29 views

How to create flag which will indicate completion zip / compress operation?

I am using 7-zip and I would like to run zip operation on dir/files. My requirement is to get certain flag say some file (complete.flag) in a directory along with zipped content to indicate zipping ...
0
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1answer
62 views

Largest possible compression for big video files using FFmpeg

I've been fascinated by a copy of “The Emoji Movie” being compressed to 45 megabytes, and was wondering how would I go about achieving such compression to very large movies. Of course, if some ...
1
vote
1answer
43 views

Detect if a Windows filesystem supports built-in file compression?

Windows NTFS supports built-in folder and file level compression. Windows FAT does not. (And there are others which fall into one of those two categories as well.) How can you detect whether or not ...
0
votes
1answer
25 views

Is it possible to check if a 7zip archive contains the same contents as a directory?

I have a folder on my external hard drive for saving minor backups (G:\LOG), whose contents I have compressed as G:\LOG\LOG.7z. However, I am unsure as to if this was entirely succesful. The folder is ...
0
votes
1answer
30 views

Is there a way to check how much a file can be compressed without actually compressing it?

I have a large (80GB) virtual drive file which I want to compress but, before I do, I want to see how compressible it actually is, before embarking on creating another (potentially) big file (if it ...
-1
votes
1answer
55 views

Why does 7-Zip deflate 257 and 258 word sizes?

Compression word sizes are usually powers of 2. Yet, 7-Zip has some exceptions: Deflate has both 256 and 258 word sizes. Deflate64 has both 256 and 257 word sizes. These seem like such trivial and ...
1
vote
1answer
36 views

Why does gzip -c give different results than gzip?

I am writing unit tests for some code and found that a simple gzip is causing a difference in my results. Upon further investigation I found that gzip gives a different .gz file than gzip -c does. Why ...
0
votes
1answer
28 views

Compressing a large number of files

I know that compressing files reduces the size of the files, sometimes at the expense of quality, so I was wondering how to compress a selection of files whose total size is larger than the maximum ...
1
vote
1answer
100 views

7zip on several terabytes, drive already compressed [duplicate]

so, I have a drive that is NTFS. it has thousands of graphics/video files that totals to about 6TB. I wanted to compress and send this info to someone. What is my best option for compressing? I've ...
0
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1answer
64 views

How to add password command in zip bat file

I have a script below which is working perfectly, all I need is to add a password & encryption while compressing. Any idea where do I put the -p command to make it work? I tried but it is not ...
0
votes
1answer
40 views

FFMPEG: H265, -Preset Options Are Out Of Order

With H264, the higher the preset (ex., -preset 9), the slower yet better the compression (the wait is long long but the file size is small). However, with H265, I found that -preset 2 gets the best ...
1
vote
1answer
143 views

Log rotation with compression?

I'm running a process on Linux (CentOS 7) which produces a lot of output on stdout. Sending it all to a file will result in a file size greater than 1 TB. But happily the output is quite compressible -...
0
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2answers
46 views

Is it wise to use compressed NTFS Windows Vmware stored on a compressed NTFS drive?

I have a Windows 10 vmware box stored on a compressed NTFS drive. So, my question is whether it's a good idea to use compressed NTFS on the "C:" drive of the Windows 10 vmware box (i.e. compressed ...
0
votes
1answer
43 views

How to compress a bunch of files efficiently?

Let's say you have a lot of files to archive. They are in several different file formats (txt, docx, pdf, png, jpg, mp3, zip, etc.). What are the best practices to compress them all, so that they ...
0
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0answers
34 views

Control the order of extraction in 7zip

Suppose I have three files, file2.txt, file1.txt, file3.txt I want to 7zip these files in the same order and extract them in the same way. I'm aware that these files when compressed will ...
0
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0answers
30 views

How to view specific path inside tar.gz?

tar -tf file.tar.gz let's me view inside the whole archive. How do you view a specific path without viewing the whole thing? E.g., I want to view only /path/foo/ Update: This command almost works ...
0
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0answers
255 views

The built-in Windows folder compression reduces free disk space instead of increasing it

A few months ago I did not have enough free space on my Windows 7 drive so I went ahead and compressed some big folders with the built in compression tool in Windows which is accessed from the ...
2
votes
2answers
193 views

Compress all images in Excel workbook

I have a workbook with over 150 worksheets. Each sheet contains an image that was copied to each work sheet from another 150 sheet workbook. The process was done by manually copying image 1 from ...
2
votes
2answers
57 views

Batch file for 7zipping all folders into .7z directories (no subfolder left inside!)

I'm sorry this has probably been asked numerous times before but I'm tearing my hair out trying to fix my batch code and I can't find a specific answer which I can use to correct my own code. I have a ...
3
votes
2answers
454 views

Win 10 Home v 1803 - Remove blue arrows on compressed file/folder icons?

Anyone know how to remove the blue arrows displayed on compressed file/folder icons in Win 10 v 1803? Apparently there was a simple registry tweak to remove them in older versions of Windows 10, but ...
0
votes
1answer
39 views

Hi , I have some problems in compressing anything,it not become smaller file size. I am using window 10,7 zip ,compression level-Ultra,

I have some problems in compressing anything,it not become smaller file size. I am using window 10,7 zip ,compression level-Ultra,etc..shown in web. But it compressed only little smaller size .eg I ...
1
vote
0answers
46 views

Extracting (or copying) files to a compressed NTFS folder makes Windows report the disk is full when it's not

I've been trying to extract a series of compressed files - total ~50GiB (uncompressed) - to a hard disk with about 55GiB of free space. Because this is a slow hard drive and with limited capacity, ...
0
votes
1answer
249 views

What archive compression makes .mp4 files the smallest?

Is there an archive-based compression format that is known to make the smallest .mp4 videos? I did a test 1080p 0:12 duration video with the only archival formats I know about: (python3) Joshs-MBP:...
0
votes
0answers
48 views

Getting E_NOTIMPL error when using -v option with 7zip on Debian

Running Debian 9, installed 7-zip 16.02 (64-bit) from debian repo. I'm attempting to create a split 7zip archive, and I receive this error message: 7z a dir1.zip dir1 -v1k 7-Zip [64] 16.02 : ...
0
votes
1answer
52 views

Is there a limit to zip-on-zip compression?

I recently made a 10.5GB file of all zeroes, and started zipping and duplicating it, similar to a zip bomb. The compression per-layer was: 1st layer (the 10.5GB file): very high compression (about ...
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0answers
43 views

Exiftool's “-tagsfromfile” does not help recover all metadata (#iphone)

This is a long standing practical problem (more than one year). I always want to finish it, but every time I tried I failed. I have consulted several threads for it. I have a bunch of daily-life ...
2
votes
2answers
28 views

If I lose a DVD that contains a zip file part, will I need to make the whole collection again?

I have been backing up my data to some DVD-DLs, and I still have the original data. But when I burned it to disc, I compressed it in a zip file to make parts of it. Now one of the disc accidentally ...
1
vote
1answer
78 views

How to uncompress file

I am trying to uncompress a unknown file type. I used file command file sample.file sample.file: gzip compressed data, was "/groupts/7bi/e7/ciuyuyout/Dump/SplitFastq/327264/ou", last modified: Wed ...
1
vote
0answers
46 views

Cannot zip a mutli-part archive, zip -FF command failing with out of memory error

Command zip -FF xxx.zip --out final_xxx.zip Fails with zip error out of memory or zip error : cannot split, read, write, file is too big.may be result of bad comrpression , try -fz I do not how try ...
0
votes
1answer
116 views

Zip vs tar (no compression)

I am currently working on changing all the computers for a company. To do the data transfers to the new computer I must either transfer it directly, or through the network by making a huge big file. ...
3
votes
1answer
74 views

Unbelievably well compressed video

How can this 6 minute video (1080p/h264) with a lot of animation and movement going on be only 50 megabytes in size with no visible compression artifacts? Is it simply because there's so much almost-...
0
votes
1answer
22 views

How to ignore already compressed files and remove original raw file

I have tried the following code with 7zip but once I run the batch script it keeps compressing the already compressed file inside the folder. Is there a way to ignore .zip file type and delete the ...
2
votes
1answer
62 views

How can I do an efficient incremental backup to cloud?

I have a folder that contain files of current and previous projects that I plan backup using versioned rsync. For more a more robust backup strategy I want to store a monthly snapshot offsite (eg ...
1
vote
1answer
38 views

Compress over 180k files

I am not even close to an expert in the infrastructure matter but I am trying to lend a hand to someone who's even worse than I am in this matter. We need to compress 184k specific files into a tar....
1
vote
0answers
62 views

Ip payload compression with xfrm

I'm trying to compress ip payload with ip xfrm between 2 computers. Computer 1 has the ip address 192.168.0.1 and computer 2 has 192.168.0.2. I successfully established a IPSec link between the 2 ...
0
votes
1answer
51 views

How can I convert a compressed archive directly into a different format without fully decompressing the archive first?

I have a large, multi-GB archive in .zip format which I want to migrate to a better, more efficient format. The problem is that I don't have enough scratch space to hold the decompressed data (not to ...
0
votes
0answers
75 views

Is superfetch configurable?

Superfetch in Windows 10 works out many things and the concerning things for this question are 1) pre-load user's preferred programs for better experience. 2) manage memory compression. Do pre-...
0
votes
1answer
134 views

NTFS compression/decompression

I bought an ASUS E200H: Win 10 Home 64-bit; 32GB of SSD (the operating system occupies around 20GB, so only around 10GB is left for me). After installing all the programs that I need, I had around ...
2
votes
1answer
116 views

How to update multiple compressed files with 7zip command line?

I need to update the file "background.png" into hundreds of .zip files in the same directory. I tried the following command without success: 7z u -r "C:\Users\xxx\Desktop\testzip\*.zip" "C:\Users\xxx\...
0
votes
0answers
31 views

7-zip “incorrect command” on context menu

I installed the latest version of 7-zip in a clean install of Windows 7 and all of the context menu items for "create archive" result in Incorrect command line. I've uninstalled it, and installed the ...
10
votes
1answer
193 views

Compressing many similar large images?

I'm dealing with a large archive of satellite images of the Earth, each one taken 15 minutes apart over the same area, therefore they are quite similar to each other. Two contiguous ones look like ...
0
votes
0answers
45 views

Nginx wordpress site turn of compression for 1 page

I have a multisite wordpress site running on Nginx and want some pages that would have personal data on them to not be send using HTTP compression to the users. I want this because with HTTP ...
0
votes
0answers
41 views

How can I compress files, with a hyphen in?

At present, I am responsible for keeping backups of an eCommerce's web files. My process is as follows: Make a Local Copy of Web files via FileZilla Upload Local Copy to a Cloud Storage Facility ...
0
votes
0answers
43 views

Cut/paste source code of a picture makes the picture corrupt

I have tried the following only in windows 10, I'm using the default apps. If I open a movie file in a text editor, I cut some of it, place it some other place, then paste it back in, the movie would ...