Kdenlive/Manual/Clip Menu/Stabilize
Stabilize
This is available from right click on a clip in the project tree or from the project menu while selecting a clip in the project tree.
This feature applys image stablizing algorithms to the clip which can reduce the shakyness of a shaky bit of footage.
This tutorial shows how to use the stabilize feature - vstab version
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The "shutter angle" setting that the narrator says he does not know what it does (1:35) ... Shutterangle is the Angle that Images could be maximum rotated for stabilization. see here