how to use ffmpeg on ubuntu

* Install ffmpeg
apt-get install -yqq ffmpeg

* Exmaple command to start video record capturing of the screen on ubuntu:
[ffmpeg -y -loglevel debug -s 1920x1080 -framerate 15 -f x11grab -i :0.0 -b 5000k -vcodec mpeg4]

Where:
-y -- Overwrite output files without asking.
-loglevel debug -- actually logging level
-s 1920x1080 -- screen size
-framerate 15  -- framerate
-f x11grab -- [fmt (input/output)]
-i :0.0 -- input (currently it is display 0.0)
-b 5000k -- bitrate
-vcodec mpeg4 -- codec (output)

* To stop video record:
Kill process of the ffmpeg
[kill -9 %i" % ffmpeg.pid]

Where:
ffmpeg.pid - is a pid of ffmpeg process


* Related articles:
https://ffmpeg.org/
https://ubunlog.com/en/record-your-desktop-from-the-terminal-with-ffmpeg/ 

How to convert audio to other formats from the terminal with FFmpeg
https://ubunlog.com/en/how-to-convert-audio-to-other-formats-from-the-terminal-with-ffmpeg/