Filter loudnorm
  EBU R128 loudness normalization
    Inputs:
       #0: default (audio)
    Outputs:
       #0: default (audio)
loudnorm AVOptions:
  I                 <double>     ..F.A.... set integrated loudness target (from -70 to -5) (default -24)
  i                 <double>     ..F.A.... set integrated loudness target (from -70 to -5) (default -24)
  LRA               <double>     ..F.A.... set loudness range target (from 1 to 20) (default 7)
  lra               <double>     ..F.A.... set loudness range target (from 1 to 20) (default 7)
  TP                <double>     ..F.A.... set maximum true peak (from -9 to 0) (default -2)
  tp                <double>     ..F.A.... set maximum true peak (from -9 to 0) (default -2)
  measured_I        <double>     ..F.A.... measured IL of input file (from -99 to 0) (default 0)
  measured_i        <double>     ..F.A.... measured IL of input file (from -99 to 0) (default 0)
  measured_LRA      <double>     ..F.A.... measured LRA of input file (from 0 to 99) (default 0)
  measured_lra      <double>     ..F.A.... measured LRA of input file (from 0 to 99) (default 0)
  measured_TP       <double>     ..F.A.... measured true peak of input file (from -99 to 99) (default 99)
  measured_tp       <double>     ..F.A.... measured true peak of input file (from -99 to 99) (default 99)
  measured_thresh   <double>     ..F.A.... measured threshold of input file (from -99 to 0) (default -70)
  offset            <double>     ..F.A.... set offset gain (from -99 to 99) (default 0)
  linear            <boolean>    ..F.A.... normalize linearly if possible (default true)
  dual_mono         <boolean>    ..F.A.... treat mono input as dual-mono (default false)
  print_format      <int>        ..F.A.... set print format for stats (from 0 to 2) (default none)
     none            0            ..F.A....
     json            1            ..F.A....
     summary         2            ..F.A....


