Convert the video to specified frame rate using motion interpolation.

This filter accepts the following options:

fps

Specify the output frame rate. This can be rational e.g. 60000/1001. Frames are dropped if fps is lower than source fps. Default 60.

mi_mode

Motion interpolation mode. Following values are accepted:

dup

Duplicate previous or next frame for interpolating new ones.

blend

Blend source frames. Interpolated frame is mean of previous and next frames.

mci

Motion compensated interpolation. Following options are effective when this mode is selected:

mc_mode

Motion compensation mode. Following values are accepted:

obmc

Overlapped block motion compensation.

aobmc

Adaptive overlapped block motion compensation. Window weighting coefficients are controlled adaptively according to the reliabilities of the neighboring motion vectors to reduce oversmoothing.

Default mode is obmc.

me_mode

Motion estimation mode. Following values are accepted:

bidir

Bidirectional motion estimation. Motion vectors are estimated for each source frame in both forward and backward directions.

bilat

Bilateral motion estimation. Motion vectors are estimated directly for interpolated frame.

Default mode is bilat.

me

The algorithm to be used for motion estimation. Following values are accepted:

esa

Exhaustive search algorithm.

tss

Three step search algorithm.

tdls

Two dimensional logarithmic search algorithm.

ntss

New three step search algorithm.

fss

Four step search algorithm.

ds

Diamond search algorithm.

hexbs

Hexagon-based search algorithm.

epzs

Enhanced predictive zonal search algorithm.

umh

Uneven multi-hexagon search algorithm.

Default algorithm is epzs.

mb_size

Macroblock size. Default 16.

search_param

Motion estimation search parameter. Default 32.

vsbmc

Enable variable-size block motion compensation. Motion estimation is applied with smaller block sizes at object boundaries in order to make the them less blur. Default is 0 (disabled).

scd

Scene change detection method. Scene change leads motion vectors to be in random direction. Scene change detection replace interpolated frames by duplicate ones. May not be needed for other modes. Following values are accepted:

none

Disable scene change detection.

fdiff

Frame difference. Corresponding pixel values are compared and if it satisfies scd_threshold scene change is detected.

Default method is fdiff.

scd_threshold

Scene change detection threshold. Default is 5.0.