Andrea wrote: in both ReframeRT and Speed PerCent there is the option "interpolate"; how does it work? Interpolate option works on keyframes (between keyframes). Unfortunately ReframeRT (and Speed PerCent) don't have OpticFlow function. At the first I thought that "Interpolate" mains "OpticFlow". I wrong. I try to do an example on "Speed PerCent" (ReframeRT is the same) with 2 keyframes. The Plugin is 10 seconds lenght. Create a keyframe at 1 second (Speed=100%) and the next keyframe at 8 seconds (Speed=200%). - Case 1, Interpolate=unchecked (both keyframes must have the "Interpolate" option unchecked): You can see that the Speed stay at 100% until the next keyframe occurs; a kind of square waves (0-1) - Case 2, Interpolate=checked (both, or only the first, keyframes must have the "Interpolate" option checked): You can see that the Speed from 100%, at the first keyframe, moves at the next keyframe (Speed=200%) interpolating the values, from 100% to 200%; a kind of ramp. Leave the Plugin window open, and look at the values. I hope it is clear enough. Thanks! IgorBeg