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Questions tagged [compression]

Compression decreases the size of data.

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35 views

Is there any way to view compressed files? [on hold]

I don't mean decompressed, I mean like open the compressed WinRAR or zip file as is (compressed) Thanks
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0answers
19 views

Express big integers into smallest possible values [closed]

I´d like to ask you if there´s the simplest way how to "compress" or express "randomly" generated big integers into smaller integers. I need something like that: "...
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0answers
14 views

How can I email longer videos from my iPad? [closed]

When I try to email videos from my iPad to myself (so that I can download them on my laptop), I run into a problem with videos longer about 15.7 MB / 2.7 minutes. Specifically, I get an err msg that ...
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0answers
11 views

Packing thousands of files into an archvie using 7-zip “Store” compression. Does this significantly speed up a file transfer?

I have a folder with 40,000 jpg images, and I'm assuming that if I pack them into a 7zip file using the "Store" compression level it would make file transfers a lot faster since the the 40k files ...
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0answers
12 views

Compression stored files

I was compressing 130 GB files using Winrar and i noticed that my free space on C: drive is decreasing, so i guessed that winrar is temporarily storing the stuff that being compressed, i waited like 4-...
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1answer
21 views

7zip - Delete files not matching extension

I have an existing archive.7z, which contains some .txt, .bin and .log files. I would like to delete all files with extension different from .txt using 7zip command line from Windows cmd. I try ...
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0answers
17 views

WS_FTP Pro: How to transfer multiple files at the same time?

I have WS_FTP Pro 12.6, and I am wondering how can I transfer more than one file at the same time? (upload or download). The Options > Transfers has only options of "Maximum number of concurrent ...
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1answer
25 views

How much smaller can the iso file be?

There have been several questions about this topic already: ISO file much smaller than extracted data Why is the windows ISO file much smaller than the installed OS? These questions ask why is the ...
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1answer
19 views

Ghetto Blaster input Equivalent

Sorry this is so long.... I used to have a cassette tape/radio unit (ghetto blaster format) device. I used to use this to record mix tapes from my dual turntable and mixer setup. The resulting tapes ...
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1answer
162 views

Windows 10 automatically compressing files and folders

Windows periodically turns on compression for folders in my user profile like the documents folder. I uncompress them and then in the future compression gets turned back on for them. It may coincide ...
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1answer
45 views

Why is 7-Zip better than the Windows 10 default file compressor? [closed]

7-Zip is significantly faster than Windows 10 at compressing files, it is more effective (smaller outputs), and is better at estimating time to completion/progress. How can it be that with all of ...
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0answers
21 views

Encrypting and password protecting archive using gzip [duplicate]

I want to encrypt and password protect my archive file using gzip command. Is there any options in gzip command for achieving this like 7zr -mhe and -p options?I also want my password to be appended ...
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0answers
24 views

Is it possible to compress a PowerPoint object vertically, but anchor the bottom of the object?

As per the subject. I have a shape that I wish to anchor the bottom of, but compress the top of the shape downwards. I tried Animations->Grow/Shrink, but I can only constrain it to either vertical, ...
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1answer
51 views

ffmpeg transcode twice compress further?

I have a collection of avi videos (say A). I first convert them into MPEG4 Part2 (say B) using ffmpeg -i ${inname} -vf scale=340:256,setsar=1:1 -q:v 1 -c:v mpeg4 -g 12 -f rawvideo ${outname}. The ...
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3answers
79 views

Which archival formats efficiently extracts a single file from an archive?

Extracting a single file from a zip file is a fast operation, so I assumed this would be true for TAR as well, but I learned that even though a TAR file is without compression, it can take a looong ...
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1answer
1k views

Two blue arrows [compression?] on literally nearly everything [duplicate]

I went to sleep, and now it seems that everything, from program folders to images, have blue arrows on the top right of their thumbnails. Naturally this has spooked me a little. Is there a way to mass ...
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1answer
154 views

How to enable memory compression Windows 10

Recently I've been running programs that really like to soak up my system memory. So much that a lot of the time I don't even have a gigabyte left. This has led my system to hang and eventually crash ...
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2answers
3k views

Why are folders and files automatically being compressed in Windows 10?

All the files on my desktop and every file I downloaded from the Internet have suddenly been compressed in Windows 10 (as indicated by two blue arrows on the top right of the icons). I have never set ...
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0answers
367 views

Why does compact.exe suddenly start to compress my disk?

I've used Windows 10 since the launch, but the File Compress Utility process(compact.exe) suddenly started to compress my hard disk a few days ago. I didn't touch any settings on the system. Why is ...
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3answers
73 views

Does compression into one large archive result in better compression than individual compression of folders?

I have several folders of around 8GB or so. Together these folders total around 60GB of data. I can compress these folders one of two ways: either individually, creating one compressed archive for ...
1
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1answer
45 views

How do I recursively compress only certain file extensions with 7zip command line?

With what commands can I compress only certain file extensions with 7zip? e.g. *.txt and *.doc and *.docx (across subdirectories, so 'recursively') I read Compress only specific files from a folder ...
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1answer
49 views

How to prevent wallpaper compression in Windows 10?

I'm running Windows 10 October Update and in case i know that Windows 10 reduces my wallpaper quality everytime! Of course this is real! I already followed this step: Open Registry Editor Go to HKCU\...
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0answers
29 views

7zip - Password error in destination server

I created a 7zip archive encrypted with AES256 standard, and moved it to another server using a external hard disk. Before moving, I took the checksum using fciv. The archive is around 120 GB. In the ...
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1answer
39 views

What needs to be changed in this archiving script to only archive specific file types?

I made this script based on past answers from superuser, but now need to only archive specific file types. I messed around trying to use wildcards but nothing I tried seemed to stick. If I wanted to ...
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0answers
33 views

How to update a zip file in ssh? (Ubuntu)

I use zip to backup a website public folder (4 GB zip) daily. Is there a command to update the same zip file without creating from scratch each time? It should do 3 things: If file exist on zip, ...
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0answers
28 views

Are USB Mass Storage data compressed when transferred? [closed]

I have found I have unused partition (~1 GB) full of zero bytes. I ran xxd -a on it and it looks transfer is somehow compressed. xxd outputted the first 8 bytes and then it was reading data until ...
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0answers
17 views

Periodically update compressed file to reflect directory?

I have a large folder, 10GB+ in size, that I would like to compress into a ZIP file other compressed single-file format. The contents of this folder changes, and I would like the compressed file to ...
0
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1answer
18 views

Tiff or JPG in PDF?

I have a bunch of scanned PDF (e.g. picturebased pdfs). When I run them through "pdf optimizers" online they frequently are reduced 70-80 % in size with hardly any noticeable difference in quality. I ...
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0answers
23 views

Compress still image ffmpeg

I tried to find by myself, but understood what this none easy what I'm thinking. Please help me find optimal way. I need compress this video with 1080p demension, but more less wight. It contain ...
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1answer
115 views

CPU barely utilized when compressing with 7-zip

When I try to compress with 7z maximum compression, my CPU utilization is under 20%. Only one of the cores is 100% loaded, and not even 100% of the time. I'm on a fast SSD, so it's definitely not ...
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2answers
37 views

How to best compress MP3/Flac so that download time is less?

How to best compress MP3/Flac so that download time/data is less? (like RAR and else) I'm afraid I get restricted access from my ISP.. so I want to compress the files as much as possible... if the ...
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1answer
90 views

7zip force ignore NTFS junctions

Windows 1803, 7z 18.05 Trying to archive and compress a folder structure with multiple NTFS junctions referencing parts of the said structure (i.e. no "outside" links) - any possibility to compress ...
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2answers
126 views

Screen recording has audio “stripped” when compressed or shared

Short question : I have taken a video screen recording on my iPhone and imported it to my computer, when i try to compress or share the file it keeps stripping the audio from the video and im just ...
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2answers
122 views

Convert (compress) JPEG images using mogrify keeping the original files in the same directory

I'm trying to convert(compress) a bunch of JPEG images using imagemagick command mogrify, keeping the original file in the same directory. I'm typing in terminal window : mogrify -quality 25% *.JPEG ...
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1answer
187 views

libx265 & ffmpeg: the better compression, the larger files?

Trying to squeeze the last bit, I made the finding, that my files get larger then smaller. Unfortunately I must have misinterpreted some parameters. Maybe you can help me. The reference is -preset ...
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0answers
23 views

Quickest way to store (uncompressed) in a .zip file [closed]

I want all my music files to be in one location for easy syncing with my portable media player & for creating backups. However there are a few albums/tracks I don't wish to sync. I don't want to ...
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2answers
184 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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3answers
73 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 ...
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0answers
57 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 ...
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1answer
45 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....
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0answers
45 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 ...
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1answer
95 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
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1answer
49 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 ...
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1answer
31 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 ...
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1answer
34 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 ...
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1answer
92 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 ...
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1answer
48 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 ...
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1answer
33 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
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1answer
141 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
656 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 ...