Kdenlive/Manual/Effects/Crop and transform/Rotate and Shear

This would appear to be the Affine MLT filter as defined in rotation.xml (/usr/share/kde4/apps/kdenlive/effects)

Rotate clip in any 3 directions

This screen shot shows settings for Rotate and Shear that can correct wide-screen footage shot while holding the camera the wrong orientation.

Do a rotate X of 900 units (the units are in tenths of a degree). You can also adjust the size with this effect