Here is a few screen shots of how I do things, the WM is OpenBox, terminal emulator Xfce4-terminal, and also Xterm, any way here they are:
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Recently started trying to learn to use ffmpeg to make a screen animation, and gif, below is my first one, after several attempts. I keep all the commands I tried as notes, to help make it easier later on and also often it is a slight different variation of the same command. Later it is just a matter of copy/paste the command I need , into the terminal.