Capture a video of your actions on the screen and accompanying audio and you have a screen cast.
This method is for Linux, probably OS-X too, is easy without bells and whistles.
Install, if you don’t have it: Ctrl-Alt-t (voor terminal)
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sudo su apt update apt install vokoscreen apt install wmctrl apt install screenkey apt install gnome-subtitles
Window manager control.
First you need information about the names of active windows:
For example, this page presents itself as:
0x03c00053 0 wswl Screen-casting - van der Worp - Mozilla Firefox
Second, you want to set the resolution of the screen cast and the position of the window. You can prepare this for multiple windows and use Alt-Tab during the cast. In this case:
wmctrl -r Screen-cas -e 1,0,0,1920,1080
What this line does: Move a window with name fragment “Screen-cas” to left-top, coordinate 0,0 and resize it to 1920,1080.
For showing what you type. After starting, open it from your tray to tune it. Fiddle a bit with transparency and size and colours. For mouse actions, consider Key-mon which I don”t use because it somehow influences virtual machine behaviour when switching windows.
What more is there to explain? Check tabs and presto, click start.
Play your cast and write subtitles under the same filename.srt.