Filter silencedetect
  Detect silence.
    Inputs:
       #0: default (audio)
    Outputs:
       #0: default (audio)
silencedetect AVOptions:
  n                 <double>     ..F.A... set noise tolerance (from 0 to DBL_MAX) (default 0.001)
  noise             <double>     ..F.A... set noise tolerance (from 0 to DBL_MAX) (default 0.001)
  d                 <double>     ..F.A... set minimum duration in seconds (from 0 to 86400) (default 2)
  duration          <double>     ..F.A... set minimum duration in seconds (from 0 to 86400) (default 2)


