Extract part of a video with a one-line command


In Windows environment, CAB refers to Cabinet files – an archive file format for Microsoft Windows. The format supports data compression and embedded digital certificates used for maintaining archive integrity. Using this file format, a user can store multiple files/folders into a single file with or without involving data compression in this archive.

Windows can unzip or extract the contents of a compressed file as it is natively compatible with CAB files. Moreover, the OS can create, extract, or rebuild cab files. This means you do not require any additional third-party software for this task. All CAB files can be unzipped using basic Windows command line tools.

There are three built-in Windows command line tools for dealing with CAB files:

expand.exe makecab.exe extrac32.exe


To see the command line option available for expand.exe, open a Command Prompt window, type the following and hit Enter:

expand /?



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By now most (if not all of you) have dabbled a little bit with Linux. Although it might look geeky and complicated at first glance, once you dip your toes into the great lake of open source it becomes a very refreshing computing experience. How do I mean ? Well : I challenge you to the following : Take a Windows Machine OR a Mac and, within 2 minutes FIND and INSTALL a free application that allows you to download a Youtube video and extract the audio to MP3. If you started off your search in Google (or in the Mac App store for that matter) you are starting to realize it is not that easy. There is a ton of ‘supposed’ freeware out there that, after installing it gives you either an app that does not completely work (unless you pay for it) or is just too complicated. Do you (as a true slider) have a Linux machine handy ? (perhaps a virtual machine or a server ) Then lets fire up the command line and give you a one line command to make that technology work for...

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I recently acquired an iPad for work purposes… so the most important thing to know is how to convert video to play on it. Use handbrake, done – short blog post.

But, that would be all too simple. Often I want to watch an entire season of a show that I have collected from various sources over the years and these often have widely varying sound levels. That is quite annoying if you set the season to play and then have to adjust the volume for every episode.

Here is a simple guide to convert your videos into a format suitable for the iPad with equalized volumes. I somewhat deliberately used a variety of tools for illustration purposes, but I think the one I selected tended to be the quickest for each step. The following code snippets assume that your videos have extension “.avi”. They also destroy source files, so make a backup.

Step 1. Extract the audio track using mplayer:
for i in *.avi; do
mplayer -dumpaudio "$i" -dumpfile "${i//avi}mp3"

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Getting started

Start by watching the 120-seconds KantuX video below. Then run some or all of the included demo macros. This will give you a good feeling of what KantuX can do. After that, you are ready to record your first macro.

KantuX is fun to use! But if you have no time to create automation scripts you can buy KantuX PRO. The license includes 3 hours of custom script creation services to get you started. So you just tell us what you want to automate, and KantuX tech support creates the macros and scripts for you.

KantuX Recording

To create your own image macros, click the "tape icon" and the image wizard appears. It helps you to take the screenshots for your macro.

Resize the screenshot area to fit your button or text box. In general, a smaller screenshot is better and faster. Select the action to perform on the screenshot: Click or...
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In our day-to-day life we come across, archived files on the platforms of all kind be it Windows, Mac or Linux. There are several Application program available for all of the platforms to create archive files as well as uncompress them. When it comes to work on Linux Platform, we need to deal with archived files very frequently.

Linux Command Line Archive Tools

Here in this article we will be discussing archive tools available on standard Linux Distribution, their features, Examples, etc. The article divided into two parts, each part contains five command line archive tools (i.e. total of 10 Best Command Line Archive Tools).

What is Archived file?

An archive file is a compressed file which is composed of one or more than one computer files along with metadata.

Features of Archiving

Data Compression Encryption File Concatenation Automatic Extraction Automatic Installation Source Volume and Media Information File Spanning Checksum Directory...
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= New tool since your last visit


= New version since your last visit


= New comment since your last visit


= New version

Type and download
NO MORE UPDATES? = The software hasn't been updated in over 2 years.
NO LONGER DEVELOPED = The software hasn't been updated in over 5 years.
RECENTLY UPDATED = The software has been updated the last 31 days.
Freeware = Download Free software.
Free software = Download Free software and also open source code.
Freeware/Ads = Download Free software but supported by advertising, usually with a included browser toolbar. It may be disabled when installing or after installation.
Free software/Ads = Free Download software and open source code but supported by advertising, usually with a included browser toolbar. It may be disabled when installing or after installation.
Trialware = Also called shareware...

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Tar command on Linux

The tar (tape archive) command is a frequently used command on linux that allows you to store files into an archive.

The commonly seen file extensions are .tar.gz and .tar.bz2 which is a tar archive further compressed using gzip or bzip algorithms respectively.

In this tutorial we shall take a look at simple examples of using the tar command to do daily jobs of creating and extracting archives on linux desktops or servers.

Using the tar command

The tar command is available by default on most linux systems and you do not need to install it separately.

With tar there are 2 compression formats, gzip and bzip. The "z" option specifies gzip and "j" option specifies bzip. It is also possible to create uncompressed archives.

1. Extract a tar.gz archive

Well, the more common use is to extract tar archives. The following command shall extract the files out a tar.gz archive

$ tar -xvzf tarfile.tar.gz

Here is a...

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When you issue commands from a shell, what you do most of the time is you launch other programs and pass them arguments. When you input your command, your shell treats it as a whitespace-separated list of arguments. This works fine most of the time -- unless you want to pass an argument that contains a whitespace character itself:

$ xgd-open My dog.png

This won't work as it is, because what the program will see is two arguments, My and dog.png. To tell your shell that this is a part of the argument, not a separator, you should escape it with a backslash:

$ xdg-open My\ dog.png

Or quote it with single or double quotes:

$ xdg-open "My dog.png" $ xdg-open 'My dog.png'

Whatever way you choose, the actual program you start will only see one argument, My dog.png. This is because this escaping/quoting thing is handled by the shell, as is splitting the command into the list of arguments.

Pro-tip #1: you can kind of combine this escaping and quoting approaches,...

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Visualization with TOPPView

Visualizing the data is the first step in quality control, an essential tool in understanding the data, and of course an essential step in pipeline development. OpenMS provides a convenient viewer for some of the data: TOPPView. The following screencasts will guide you through some of the basic features of TOPPView.

Panning / Zooming (1D View)

Your browser does not support the video tag.

Zoom into a spectrum in 1D view

All previous zoom levels are stored in a zoom history. The zoom history can be traversed using CTRL+/CTRL- or the mouse wheel (scroll up and down). Zooming into the data: either mark an area in the current view with your mouse while holding the left mouse button plus the CTRL key to zoom to this area or use your mouse wheel to traverse the zoom history. If you have reached the end of the history and keep on pressing CTRL+ or scroll up, the current area will be enlarged by a factor of 1.25 Pressing the...
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Check out my other tutorials on the Unix Page, and my

Check my blog

Copyright 1994, 1995 Bruce Barnett and General Electric Company

Copyright 2001, 2013 Bruce Barnett

All rights reserved

You are allowed to print copies of this tutorial for your personal use, and link to this page, but you are not allowed to make electronic copies, or redistribute this tutorial in any form without permission.

Original version written in 1994 and published in the Sun Observer

This section describes C Shell (CSH/TCSH) programming. It covers conditional testing, control loops, and other advanced techniques.

This month begins a tutorial on the bad-boy of UNIX, lowest of the low, the shell of last resort. Yes, I am talking about the C shell. FAQ's flame it. Experts have criticized it. Unfortunately, this puts UNIX novices in an awkward situation. Many people are given the C shell as their default shell. They aren't familiar with it, but they have...

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Glen Turner would like to thank his family for allowing him to work on this project for the surprisingly large number of evenings which it took to write this . Thank you Karen, Kayla and Ella.

The console is the text output device for system administration messages. These messages come from the kernel, from the init system and from the system logger.

On modern small computers the console is usually the computer's attached monitor and keyboard.

On many older computers the console is an RS-232 link to a terminal such as a DEC VT100. This terminal is in a locked room and is continually observed by the minicomputer's operators. Large systems from Sun, Hewlett-Packard and IBM still use serial consoles.

It is usually possible to login from the console. A login session from the console is treated by many parts of the operating system as being more trustworthy than a login session from other sources. Logging in as the root super-user from the...

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This “Preview Extraction” plugin for Lightroom allows you to extract JPG preview images from a Lightroom catalog's image cache. This might be of use if you have lost the original master images, or don't have them at hand.

This plugin works in Lightroom Classic, and older versions as far back as Lightroom 4.

The same download works for both Windows and Mac. See the box to the upper right for the download link (in orange) and installation instructions.

After installing, select the thumgnails for the images whose preview you want to extract, then invoke via File > Plugin Extras > Extract Preview Images.

I have no need for this myself, but I wrote it because I thought someone, somewhere, at some time, might find themselves in a pinch having lost their original image files, and might want to extract what they could from Lightroom's image cache.

I hope you never need this plugin.

Other Options

Marc Rochkind's has a still-available but...

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DVDVob2Mpg is a simple, free, straightforward and very fast VOB (or VRO) file to MPG converter.

Contrary to popular belief, VOB and VRO files are not the same as MPG files. VOB and VRO files contain the MPEG, but also various other data, and headers may be incomplete or wrong etc. Because of that, VOB and VRO files typically don’t play well using media Players (for instance Windows Media Player). Some DVD Video Playback software is able to get past that, but not always, especially when the relevant IFO files are not available.

Typical problems are: timing issues, not being able to show the progress properly, no way to skip forward, crashes, missing audio, audio off sync, only showing the first 5 seconds of the video etc.

DVD Video authoring applications and Video Editing software suffer from the same problem. They may accept VOB/VRO files as input video, but they often fail or even worse, crash on faulty headers, timing data etc.

The same goes for VOB...

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