Let's first talk about what frame interpolation is: actually, frame interpolation is not difficult to understand. It takes the original 24 frames of a video as keyframes, then uses algorithms to calculate the coherent frames between each keyframe, and inserts them into the keyframes to achieve the effect of increasing the frame rate. Although this significantly improves smoothness, it only applies to hand-drawn 2D animation, and the effect is not as obvious for 3D animation or movies (since the latter are usually already 60fps and don't require frame interpolation).
Let's take a look at the effect. This is the frame rate before frame interpolation:
This is the frame rate after frame interpolation:
In fact, it can reach up to 120 or even 240 frames, but that requires better hardware configuration, which is not possible for my integrated graphics machine.
If you want to try it, you can click here to download and experience it. There is a complete tutorial inside. If conditions permit, it's better to support the genuine version (19.9 euros), after all, it would be a pity if such a good tool stopped updating.