This article guides you to record your screen + audio with Kazam in GNU/Linux. For short, this is how you can do screencasting in GNU/Linux, like what you do with Camtasia Studio or such program in Windows. Kazam is GUI based (no command line) and is very simple to use (has very few buttons) so I hope by reading this, soon you can do your screencastings in GNU/Linux. Enjoy.
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Ubuntu, Debian, Linux Mint, elementary OS, deepin
sudo apt-get install kazam
sudo yaourt -S kazam
1-Click Install http://software.opensuse.org/package/kazam
1) Prepare Microphone
Plug your microphone jack in. For example, I can record my voice even just with a Samsung headset (from a handphone).
2) Prepare Input Volume
3) Prepare Kazam
Set the output codec, set the FPS value. I recommend you to use .webm VP8 video format (with OGG Vorbis audio format inside). Read FSF’s article about free video format and recommendation about OGG. Your FPS value depends on your need and your hardware capability, I set it for 5 and it is good enough.