Compression decreases the size of data.

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262 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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1answer
562 views

Windows : Compress the drive/file/folder to save disk space [closed]

This option is available for both my primary as well as external hard disk. I was wondering about the pros and cons of this feature. I found some at ...
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0answers
60 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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0answers
107 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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0answers
30 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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3answers
299 views

Does 7zip compression level affect decompression speed?

I have a directory that I would like to password protect and encrypt. I am using PeaZip to do this using 7zip compression. I'd like to use the 7z like a directory and hard drive space is not a ...
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1answer
70 views

Push format of image while paste from clipboard

Problem: email client (theBat!) is using jpg for all images from clipboard. I need to use png or gif instead. For now I can only save image to disk in needed format and insert through menu - very ...
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2answers
147 views

Where do I find the “send to” Compressed (Zipped) folder

I am trying to compress a Zip archive to an external hard drive on my PC. Space is limited on the system so I can't compress it locally. I have access to WinZip but can't download or install any ...
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1answer
30 views

How to use pv to see decompression progress?

I've seen: How to use Pipe Viewer (pv) for measuring compression progress? Is there a way to do the same thing for decompressing a gzipped file?
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0answers
77 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 ...
2
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1answer
73 views

Windows 8 - Compress Drive did not continue after cancel/reboot

I checked the "Compress Drive" option on an external drive (1TB) on Windows 8. After clicking OK, the OS started to compress the files folder by folder on the drive. As it took too long, I shutdown ...
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2answers
141 views

How can I specify the order files should be compressed in 7zip?

I have a set of files I would like to compress that I know to be repetitive and compressible, but 7zip chooses a non-optimal order to compress the files and fails to take advantage of their ...
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2answers
2k views

How to extract multipart rar with missing parts?

I have a multipart .rar archive containing a single .tar.gz file inside it (don't ask why, that is just how it was made). I am missing a few of the parts, but do have the first part. I would like to ...
0
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1answer
115 views

Why does ColorSync compression increase PDF file size for me?

I have this ebook that I'm trying to send to my Kindle from my Mac. I've done this before; Get a pdf, send it to Kindle address, and make sure the subject is "convert". This causes Amazon to convert ...
2
votes
2answers
172 views

Compressing compressed .tar.gz files deterministically

I want to perform a series of recompressions of compressed files to study their properties. At first, I tried simply recompressing .zip files in a loop: for f in $(seq 1 100) do zip $f.zip -9 -v ...
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1answer
461 views

How to convert DV to robust compressed video file for editing later

I have 60Gb of DV footage that I need to store, but 60Gb is WAY too big. I need to transcode it to a lossy format, but I need the resulting video to be robust such that it can be easily edited with a ...
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2answers
39 views

What could have gone wrong when compressing a very big directory on OSX? The resulting zip won't decompress

When working with the edition of a movie, I was out of space on my HD so I temporarily compressed a very big directory to a zip file and removed the original as a way to get some extra space. I did it ...
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1answer
155 views

How to convert a file of format tar.gz to tar.bz2?

Like the title says, how do I do this conversion from the Linux console?
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1answer
2k views

How to get compressed memory back in OS X 10.9 Mavericks?

I followed the suggestion to disable compressed memory, now I want to get it back. I checked the code, it was 4 before disabling. So, I tried: sudo nvram boot-args="vm_compressor=4" That was not ...
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2answers
349 views

Force all files in a NTFS compressed folder to automatically compress [Windows]

Is it possible to keep all the files within a NTFS-compressed folder compressed? For example, if I have a compressed a folder using NTFS compression, it will compress all the files inside the folder ...
0
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2answers
103 views

How to Undo the “Remove Unnecessary Blank and EOL” in NotePad++

I am using Notepad++ for my coding , just used the their Edit > Remove Unnecessary Blank and EOL feature to remove the space and tabs and compressed the code , but how do i UnDo it ? is there ...
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3answers
2k views

Disable Windows 8.1 Component Store (WinSxS/DriverStore) automatic compression?

Windows 8.1 has a new Scheduled Task (Servicing\StartComponentCleanup) which will automatically delete or compress superseded and unused files from the Side by Side store, DriverStore and drivers ...
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0answers
313 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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0answers
85 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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0answers
300 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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1answer
668 views

Avoiding extreme fragmentation of compressed files on NTFS

Problem explanation I'm storing windows disk images created with wbadmin on NTFS drive, and I found compressing then with NTFS compression gives 1.5-2× space conservation, still giving full ...
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1answer
1k views

how to remove full path when doing tar.gz compression

I'm using this command to archive a directory named g from java code: tar czf /a/b/c.tar.gz /e/f/g When the tar file c.tar.gz is created, I find an entire path e/f/g then all files of the g folder ...
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2answers
517 views

let tar auto detect compression type when extracting from stdin

I use GNU tar. It can auto detect compression type when compressing/decompressing files. But I need to decompress an archive from stdin and the compress type is unknown. I noticed that tar can give me ...
0
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1answer
855 views

Does anyone know an effective method to ultra-compress files?

Does anyone know an effective method to ultra-compress files? You might have seen some PC games compressed to incredibly small sizes here and there (like GTA San Andreas which was compressed to 1mb ...
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1answer
118 views

Is there a way to compress files at different compression levels inside a single 7zip file? [duplicate]

Some files are compressed using their own compression scheme and some aren't. If I try Max compression on an already compressed file, I'll get 1%-2% better compression at most. The amount of time ...
5
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1answer
302 views

How to exclude a folder in 7zip?

I want to compress the folder C:\Temp but without a specific subfolder (e.g. C:\Temp\test). How can I do that with 7zip? I've come up with the following command: c:\Temp>7zip a -t7z test.7z ...
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0answers
423 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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1answer
45 views

Strange behavior encountered while using tar

I had a folder of useless C programs for a project. When I was compressing it using tar, I kept using tar -cvf c-project and then realized I'm setting the flag for the file name and I'm giving ...
2
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1answer
498 views

How do I find out the compressed / uncompressed file sizes on btrfs?

I am using btrfs on one of my hard drives. I would like to know the actual file size and the compressed file size on btrfs. I am interested in seeing the compression ratios per file . For example ntfs ...
2
votes
1answer
49 views

How do I reinforce compression options?

Shortly after I got my computer, I enabled NTFS compression on it, selecting the option to compress "all files and subfolders". I recently noticed that several folders on my PC are not compressed ...
0
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1answer
78 views

Extracting one file from archive: 7-zip requires decompressing entire archive?

I've noticed that when browsing an archive containing multiple files with 7-zip 9.20 Windows GUI, extracting one file for previewing takes significantly longer with .7z than .rar archives. With .7zips ...
2
votes
2answers
722 views

What does the number after 7-zip's -m switch mean?

7-zip has a command line switch to set the compression method, -m followed by a number, e.g. -m0=LZMA. What does the number (0 in the example) mean? Different numbers produce slightly different ...
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0answers
111 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 ...
2
votes
1answer
158 views

tar: compress only the contents of a folder

I have to compress only the contents of the folder, not the folder with tar, there is any argument for that? I have search but I don't find anything. Example: mainfolder/ asd1 asd2 ...
0
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1answer
316 views

zip sub folders individually

can anyone help me make a batch file for my problem. i have multiple folders that i want to compress individually. root folder 1 file 1 file 2 ...
0
votes
1answer
62 views

Human insensitive video compression

I have an AVI video file recorded by my laptop web-cam. It's only 10 minutes but it has so large size, 3.9 GB! I'm not expert in multimedia but I've seen really good quality long movies in only 4 GB. ...
4
votes
1answer
2k views

tar/bz2 compress a file removing uncompressed original

Is there any way to turn a directory called dir1 into dir1.tar.bz2 without keeping the original? I need to save space and want to compress some large files but don't have enough room to keep a ...
2
votes
4answers
143 views

What other archive formats save Date Created and Date Accessed?

7-Zip on Windows will save the Date Created and Date Accessed when compressing a .zip file, however it does not do this for its (referring to 7-Zip) native .7z format. Any Unix-based formats are ...
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2answers
4k views

What is more efficient / faster, rsync compression or ssh compression?

I currently rsync files: (i) locally and (ii) remotely over WAN (connection c. 8mbps down / 1.5mbps up). I am considering adding to rsync: -z to compress files. Or alternatively adding to ...
2
votes
1answer
974 views

Windows “Send to Compressed (zipped) Folder [in different location]"

Is it possible to change the “Send to Compressed (zipped) Folder" functionality to create the zip file in a pre set directory, rather than the current one? Also, any information anyone can share ...
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2answers
163 views

How much can data be compressed? [closed]

Is there a scientific limit to how much data can be compressed? What I mean is, compression is essentially representing a larger amount of data with a smaller one, such as representing a=abc b=def ...
1
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0answers
2k 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 ...
0
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1answer
81 views

How can I zip or rar file names in txt file from command line?

I'm using a batch script to output filenames with specific attributes to a .txt file, in this case older than 30 days. I'd like to then zip or rar those files that are listed in the .txt file. How ...
2
votes
1answer
175 views

Compress the silence - audio file formats

How do you compress audio silence? I'm using Audacity and have been exporting variable compression mp3s. But a 1minute audio track is about the same file size regardless of how much silence there ...
0
votes
1answer
167 views

How to keep daily tar.gz backup with less redundant data

Like most of you, I have a few daily tag.gz snapshot of a folder (of any application). There is only a few different each other but the tar.gz is not a diff/delta friendly format. Most data in the ...