Interpolation

Interpolation section

Name: interpolation.enabled
range: yes, no
default: yes

With interpolation off, blending averages the recorded frames, or the frames of pre-interpolation when that is on.

Except for Frame rate, the previews on this page interpolate a 60 fps copy of the clip to 240 fps, so that recorded can show the frame of the 240 fps clip at the same moment.

Engine

Name: interpolation.engine
range: svp, rife
default: svp

Sets how interpolini finds the motion between two frames. The svp engine follows the motion of small blocks of pixels. The rife engine uses a neural network. Here, svp breaks up the sword edge, and rife keeps it closer to the recorded frame, but neither engine wins on every clip. Which one to use depends on your footage and on the look you like.

Each engine shows its own settings in the panel. The svp engine can also run after pre-interpolation.

recorded svp rife

Frame rate

Name: interpolation.fps
range: 2 to 100000, or 1x to 1000x
default: 960

Sets the frame rate of the interpolated frames, in fps or as a multiple such as 4x. A multiple applies to the clip rate, or to the pre-interpolation rate when that is on.

Blending takes its frames from this stream, so a higher rate gives a smoother blur. With blending off, this is the output frame rate. The preview blends each rate to 60 fps. At 120, the wall edge shows 3 separate copies. At 960, it is the average of 17 frames.

120 240 480 960

Speed

Name: interpolation.speed
range: medium, fast, faster, fastest
default: faster

Sets how closely svp searches for motion. Smaller blocks can follow smaller shapes, but the result depends on the clip. Here, fast keeps the sword best and fastest breaks it apart.

medium	8 px blocks, or 16 px without a GPU, with refinement
fast	16 px blocks, with refinement
faster	16 px blocks, no refinement
fastest	32 px blocks, no refinement

Tuning

Name: interpolation.tuning
range: weak, smooth, film, animation
default: film

Sets what svp expects from the clip.

weak	a more thorough search for motion
smooth, film	the standard search, with the same result. The example shows film.
animation	32 px blocks for flat drawn pictures. Warps edges in a game.

recorded weak film animation

Look

Name: interpolation.algorithm
range: 2, 13, 23
default: 13

Sets the SVP algorithm for the interpolated frames. The panel names the values sharp (2), standard (13) and smooth (23). Here, sharp keeps the sword whole with a blue fringe, and standard leaves holes in it. Smooth gives the same frames as standard in this clip. Which look is right is a matter of taste.

recorded sharp standard

Half-size analysis

Name: interpolation.half size
range: yes, no
default: yes

Makes svp search for motion on a picture of half the size. The result depends on the clip. Here, no erases most of the sword. It only works when the width and height of the clip are divisible by 4.

recorded yes no

Backend and Model

The rife engine has the same Backend and Model settings as pre-interpolation, so a change in one place applies to both.