I have Krita as painting software.
I need a free recording software to record me creating my art.
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To record your whole screen, in the command window or terminal:
ffmpeg -f gdigrab -framerate 10 -i desktop [output]
Or to just record the Krita window:
ffmpeg -f gdigrab -framerate 25 -i title=Krita [output]
Where [output] is the filename that you would like to record to including the extension, e.g.: