Converting video files with ffmpeg in Windows cmd

A few months ago I’ve faced up with a task converting audio track in video file to another format in Windows. There are not much simple programs to do this task. The task is simple: convert any audio track to mp3 without converting video track. All programs that were tested propose to convert video and audio track without any options to copy video stream. This case increase a time of converting a lot and was dismissed by default.

Terminal hotkeys

Command line could be the mighty tool but printing long command and paths to files get bother fast. In this article we will show you main hotkeys to make it faster. Expirienced users like command line for it's opportunities to handling tought tasks in couple of lines. But for newbies it seems like hell to typing all those commands and parameters.

Using APT command in Linux

Apt is a command line utility for install, update, remove and other operations. It manage dep packages in Ubuntu, Debian and distributions that based on it. It consists of most used commands apt-get and apt-cache but differs the default options. Apt was created for interactive use. Most of the commands of apt utility should be executed with sudo premissions.

Couldn't find foreign struct converter for 'cairo.Context'

TypeError: Couldn't find foreign struct converter for 'cairo.Context'

This error was caused by one of the application installed in the OS. It's easy to fix it - try to install packages it needs:

sudo apt-get install python3-gi-cairo


sudo apt-get install python-gobject-cairo



Install i3lock screenlock in Lubuntu 19

In the last (at that moment) version of Lubuntu 19.04 desktop environment was moved to LXQT. In looks fine, but the role of screensaver still occupied by xscreensaver application with it's awful window to enter the credentials. I've already have a post about theming this window .

You should delete it immediately after OS installation: