Filter anlms
  Apply Normalized Least-Mean-Squares algorithm to first audio stream.
    slice threading supported
    Inputs:
       #0: input (audio)
       #1: desired (audio)
    Outputs:
       #0: default (audio)
anlms AVOptions:
  order             <int>        ..F.A..... set the filter order (from 1 to 32767) (default 256)
  mu                <float>      ..F.A....T set the filter mu (from 0 to 2) (default 0.75)
  eps               <float>      ..F.A....T set the filter eps (from 0 to 1) (default 1)
  leakage           <float>      ..F.A....T set the filter leakage (from 0 to 1) (default 0)
  out_mode          <int>        ..F.A....T set output mode (from 0 to 3) (default o)
     i               0            ..F.A....T input
     d               1            ..F.A....T desired
     o               2            ..F.A....T output
     n               3            ..F.A....T noise


