Filter hqdn3d
  Apply a High Quality 3D Denoiser.
    Inputs:
       #0: default (video)
    Outputs:
       #0: default (video)
hqdn3d AVOptions:
  luma_spatial      <double>     ..FV..... spatial luma strength (from 0 to DBL_MAX) (default 0)
  chroma_spatial    <double>     ..FV..... spatial chroma strength (from 0 to DBL_MAX) (default 0)
  luma_tmp          <double>     ..FV..... temporal luma strength (from 0 to DBL_MAX) (default 0)
  chroma_tmp        <double>     ..FV..... temporal chroma strength (from 0 to DBL_MAX) (default 0)

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

