Xubuntu proxy settings

I have my laptop running Xubuntu 12.04. And there is no GUI to set up proxy settings. So it can be done via terminal. Open /etc/environment and add the following lines

http_proxy="http://user:password@proxy:port/"
https_proxy="https://user:password@proxy:port/"
ftp_proxy="ftp://user:password@proxy:port/"
socks_proxy="socks://user:password@proxy:port/"

Also if you want the apt-get is working behind proxy, go to /etc/apt/apt.conf and add

Acquire::http::proxy "http://user:password@proxy:port/";
Acquire::https::proxy "https://user:password@proxy:port/";
Acquire::ftp::proxy "ftp://user:password@proxy:port/";
Acquire::socks::proxy "socks://user:password@proxy:port/";

Restart X by log out and back in again for settings to take effect.

Video files concatenation

How to concatenate 2 files in Ubuntu? Using Pitivi is not good when you want to preserve the original quality. Actually while playing with Pitivi I haven't found good enough rendering options that will be suitable for me and have quality similar to the original. So I've tried to use command line. The software is called ffmpeg or  avconv in the Ubuntu 12.04.

Pitivi video editing tutorial

Pitivi is a free video editor software for Linux. Here is a small example of how to use it. I have 2 movie clips 10 minutes long each from my car DVR, and I want to stick them together and cut some unnecessary parts. So let's start by opening Pitivi editor.