Filter smartblur
  Blur the input video without impacting the outlines.
    Inputs:
       #0: default (video)
    Outputs:
       #0: default (video)
smartblur AVOptions:
  luma_radius       <float>      ..FV..... set luma radius (from 0.1 to 5) (default 1)
  lr                <float>      ..FV..... set luma radius (from 0.1 to 5) (default 1)
  luma_strength     <float>      ..FV..... set luma strength (from -1 to 1) (default 1)
  ls                <float>      ..FV..... set luma strength (from -1 to 1) (default 1)
  luma_threshold    <int>        ..FV..... set luma threshold (from -30 to 30) (default 0)
  lt                <int>        ..FV..... set luma threshold (from -30 to 30) (default 0)
  chroma_radius     <float>      ..FV..... set chroma radius (from -0.9 to 5) (default -0.9)
  cr                <float>      ..FV..... set chroma radius (from -0.9 to 5) (default -0.9)
  chroma_strength   <float>      ..FV..... set chroma strength (from -2 to 1) (default -2)
  cs                <float>      ..FV..... set chroma strength (from -2 to 1) (default -2)
  chroma_threshold  <int>        ..FV..... set chroma threshold (from -31 to 30) (default -31)
  ct                <int>        ..FV..... set chroma threshold (from -31 to 30) (default -31)

This filter has support for timeline through the 'enable' option.

