Apply variable blur filter by using 2nd video stream to set blur radius. The 2nd stream must have the same dimensions.

This filter accepts the following options:

min_r

Set min allowed radius. Allowed range is from 0 to 254. Default is 0.

max_r

Set max allowed radius. Allowed range is from 1 to 255. Default is 8.

planes

Set which planes to process. By default, all are used.

The varblur filter also supports the framesync options.