Questions tagged [compression]

Compression decreases the size of data.

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Windows 10 SSD maintenance/defragmentation/compression query

I have a 1TB Samsung EVO SSD as my system drive (Windows 10). I let it get almost full and paid the price - performance writing new files dropped off by a factor of something like a thousand. I ...
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How do I know the compression algorithm used by Compact Os in Windows?

By using the command compact.exe /compactos:query all I get is if compact OS compression is activated or not, but not what compression algorithm is used, such as LZX, XPRESS4K, XPRESS8K or XPRESS16K. ...
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What exactly does NTFS compression do to files?

Until not so long ago, I've not even known that you could compress specific folders, files or even entire drives using windows' builtin compression. A simple way to do this is just go to properties ...
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Why FFmpeg not support multiple color palette when encoding apng?

When I encode png sequences to apng animation using FFmpeg, the result is good but the file size is too large. If I compress the images using pngquant and then run FFmpeg, it throw out en error : ...
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How can I compress a large collection of images together (for backup purposes) as densely as possible?

I have a fairly large (by personal use standards) collection of images. This is roughly in the range of 150k files of a total size of 200GB. It is by and large PNG and JPG files, each making up about ...
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Something wrong with video length, h.264 and size?

While uploading videos to my website, I noticed that when they were split into 10 distinct 10 minute videos, they add up in the order of 300mb, but if they are to be concatenated into a single render ...
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Bitrate over Codec for the best quality?

AFAIK bitrate means how many bits are used to record the audio/video within one second, while codec (or file format) means the compression method to store the clip. To me, the higher the bitrate, the ...
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How to best apply compression in Windows to speed up a slow disk with a powerful CPU?

I have a desktop PC with a reasonably powerful Ryzen 3700X (8c/16t) that runs Linux. I need to occasionally use Windows, but not often enough to justify dual-booting. I have instead installed Windows ...
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How to stop Word from rasterizing imported vector graphics?

I have various vector graphic images in PDF or EPS form (EPS is now only usable on Mac though), and they often contain embedded bitmap images and/or transparency. When I import them into MS Word, they ...
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Check progress on NTFS compression

I have a NTFS disk with compression enabled and moved a couple of files (300gb~) to it. Every time I refresh the windows explorer window I see that the free space on the disk is growing, which I ...
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How to convert a ppt slideshow to a pdf?

For a training, I was given several large powerpoint files, each of which opens automatically like a slide show. I can't find any way to edit them. My goal is to compress them by converting them to ...
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Is it possible to unzip/zip a file based on a specific condition

Just wanted to know out of curiosity,is it possible to unzip/unrar(decompress) or zip/rar(compress) a file based on a certain condition. For example,let's say you have a folder of 10 images,and I ...
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How to compare huge sparse files efficiently?

There are two sparse files. They are proved identical by diff. But it took 20 minutes (too long time) to compare. I am thinking of taring them into tiny files to speed up the comparison. But they tar ...
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Add attribute to a file/folder

I tried that to add an attribute to a file/folder Get-ChildItem '$PATH' -Recurse | foreach{$_.Attributes = $_.Attributes + 'Compressed'} Problem is that it create a cycle like that : Not compressed &...
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How to compress all subfolders to separate files in terminal?

Using Terminal in OSX. I have a directory that looks like this: Folder01 Subfolder 1 File1 File2 Subfolder 2 File1 File2 Folder02 Subfolder 1 File1 ...
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Using ffmpeg + MPDecimate to get rid of exact duplicate frames (i.e. losslessly)

According to the documentation, mpdecimate will "Drop frames that do not differ greatly from the previous frame in order to reduce frame rate." I would like to be able to remove only exact ...
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Losslessly reducing framerate of a 'video of a video'

I asked this yesterday but it was incorrectly closed as a dupe of question:Reduce video frame rate without dropping useful frames The difference between that question and this question is - in that ...
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Losslessly compressing screenrecording of video chat [duplicate]

I have a screenrecording of a video chat I had and the filesize is massive because the screen recording itself was done at 59.93 fps. However, I think the video chat was something like 15-30 fps. Plus ...
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is there a way bulk single files to zip?

we have some thousands of files in a folder, and the software that runs it now allows to read from compressed folders, but only 1 large file per compressed folder is there any software that would ...
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How can we unlock a 7z archive (w/ password) without extracting it?

The question in the title. I am aware; 7z x blah.7z -p'mysecretpassword' exists, but I wish to only unlock the archive - allowing my Python script to access it. Not extract it. The reason I can't ...
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Can curl decompress a local file it already downloaded?

I tried downloading the source code of a web page using curl. The resulting file appears to contain "random" characters; in fact it is a compressed version of the html code. I know that ...
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Maintain small file size while repeating video but not audio

Does anyone have any idea how to do this? I have a short video clip that I want to repeat 10 times, but during that time I want it to play a single audio track. This is easy enough to do in any video ...
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OSX - Ditto Compressing Command and Filename Suffix

I want to run this command but also have it so that the filename has a suffix that either increments or even better, I would love for it to have the date. Eg: output_zip_directory_2022-01-21.zip This ...
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2 votes
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How can I compress a large video file as much as possible e.g. 2 GB. to 200MB?

Recently I have received a very large 2 GB video file that was compressed to 200 MB inside a RAR file. How is this possible? I have tried this instruction but it did not work. The codec of the video ...
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Compress a folder with internal complex folders tree and UTF-8 mixed languages files and formats for archive

I have a cloud folder on my hard-drive which I want to archive, in-order to do so I would like to compress it using best of choice compressor for that task : Complex sub-tree of internal folders with ...
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Compress a damaged-disk with lots of duplicate files dd image for archival

Here is the description of the problem: I'm trying to compress the best way I know a before-recovery disk image so that if my client data is ruined by the recovery they can go back to the original ...
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1 vote
1 answer
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Why 7z compression speed and CPU usage are low

On such system: To compress with 7Zip I use such setting: The compression looks like: I even change compression level to 0 - no compression and change destination disc to separate physical SSD ...
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2 votes
1 answer
217 views

Check whether output is smaller than input? (ffmpeg conversion with batch)

I've made a batch file that's able to compress many png files (with ffmpeg) as well as remove any unneeded metadata (using exiftool). @echo off title Compress png to png color 08 FOR %%a IN (*.png) ...
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Batch compress pdf files and maintain folder structures

I'm looking for a way to batch compress PDFs but also keep the folder structures. Currently, we're using Acrobat, but it doesn't keep the folder structure when outputting. Is there a way to configure ...
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Enable memory compression without enabling pagefile in Windows 11 [duplicate]

It seems that when the pagefile is disabled, memory compression does not work. But according to the descriptions, this feature (memory compression) was exactly developed to make pagefile not needed. ...
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Defragment BTRFS to change the compression level

I can do: btrfs filesystem defragment -rvf -czstd ./ But not: btrfs filesystem defragment -rvf -czstd:1 ./ I get the error: ERROR: unknown compression type zstd:1 Is there any way to change the ...
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Create ZIP archive containing Windows junctions?

I have a folder containing normal files and directories but also Windows junctions. When I try to zip the folder I get an error that some files cannot be read. These files are Windows junctions. Is it ...
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FFMPEG Convert image format with best possible output?

With the standard command you can theoretically convert almost anything (ffmpeg -i input.png output.tiff), but I'm afraid that the output will differ from the input in terms of quality and/or ...
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2 answers
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Compressing music files to fit a given size [closed]

I have a few thousand mp3 files on my pc of different quality (total 10gb). I'd like to compress all of them to fit my smart watch which has 4gb storage. Are there any tools to compress all of them ...
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Why is compression not recommended in OpenVPN?

In latest stable OpenVPN series, 2.5, all compression-related directives are considered deprecated. From wiki page: Compression is not recommended and is a feature users should avoid using. To signal ...
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Struggling to copy files together, issue downloading voxceleb on windows [duplicate]

copy /b vox1_dev_wav_partaa+vox1_dev_wav_partab+vox1_dev_wav_partac+vox1_dev_wav_partad vox1_dev_wav.zip Trying to use this to merge 4 files into a compressed file, but it keeps saying that 'The ...
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Why when encoding AVIF images with avifenc on slowest speed file size get bigger?

My source file is lossless PNG, 576x767, file size 1.26 mb. I experiment with encoding AVIF format and read, that higher encoding speed setting will run faster, but produce worse compression ...
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fast decompression, lz4 doesn't reach advertised speeds

I am transferring an lz4-compressed disk image (compression level 1) from a fast SMB network source (reaches 1 GB/s (not Gb/s)), but am experiencing relatively slow unpack speeds, nothing near the ...
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4 votes
1 answer
16k views

Can I change the compression ratio of a JPEG image on travel.state.gov?

When on travel.state.gov's photo editor, I get Image is overly compressed. Please use a compression ratio that is less than 20:1 Is there anyway to get past this screen in the application given a ...
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Data compression algorithm in chrome and chromium

I was doing some research on browsers and I want to know what is data compression algorithm really mean in browser. and what are algorithm currently using in chrome, and chromium.
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Windows: How to convert binary database file (compressed with zlib) to human-readable string data? (ProcrastiTracker .PT file)

The current question is derived directly from this one, as my general problem is how to process the data collected by the ProcrastiTracker program. Once installed on a Windows machine, ...
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How to decompress .bin file that has no header or magic bytes?

So i have a compressed data , but couldn't know the compression methode , The decompressed size written in header of the main file whitch contains this compressed data , Its not .7z or .lzma or any ...
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What types of compressed archives does Microsoft Windows understand by default (Windows 10)

What file formats of compressed archives does Windows 10 natively know how to work with on fresh install? There are many file formats for compressed archives. To name a few: .tar.gz .zip .rar .7z etc ...
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How can I reduce the size of a Virtual Box VM?

I have an Ubuntu Server installed in Virtualbox. Its VDI file's size is 4.2G and it has a Dynamically allocated drive. When I export it, the file size of the OVA file is 1.4G. I want to reduce the ...
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does ntfs writes files two times when compression is used?

I've read in this answer https://superuser.com/a/1358858/1506333 that ntfs does double writes, uncompressed data first, then compressed, is it true? Motive Nº1: It will kill SSD musch faster, since it ...
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How to fix tar/gzip files after change extension?

I am new in linux. Today I got issue.Then I run tar to zip multiple files(hundreds files) I got a.php.gz,b.php.gz,etc. After that I rename files via command line find /usr/local/var/www/html -depth -...
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Error when tar a compressed file

I try to install krona tools, so I downloaded its archive first as follows: curl -LOk https://github.com/marbl/Krona/releases/download/v2.7/KronaTools-2.8.tar then #untar tar -xvf KronaTools-2.8.tar ...
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Difference between .zip and .zip64

I am sorry if I sound wired!. After reading about .zip and .zip64 in the wiki, I realized that one of the major differences is about the size limit. Here is my options: SL # Raw file File size ...
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Windows 10, file compression - error message - insufficient space on the drive to complete the operation

I have a Windows 10 OS on the C: SATA drive (free 64.6GB). I have an i5 - 10400 6 cores and 12 Gb ram that does not exceed 75%. MS considers no need to offer Ready Boost to my NVme drive. If it ...
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How to perform a microsofts .mun compression to create compressed .mun files?

A few including myself are trying to inquire on how to create windows compressed .mun files. For example under C: Windows/SystemResources you will see many mun files We are able to edit a .dll.mun ...
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