Filter aemphasis
  Audio emphasis.
    Inputs:
       #0: default (audio)
    Outputs:
       #0: default (audio)
aemphasis AVOptions:
  level_in          <double>     ..F.A.... set input gain (from 0 to 64) (default 1)
  level_out         <double>     ..F.A.... set output gain (from 0 to 64) (default 1)
  mode              <int>        ..F.A.... set filter mode (from 0 to 1) (default reproduction)
     reproduction                 ..F.A....
     production                   ..F.A....
  type              <int>        ..F.A.... set filter type (from 0 to 8) (default cd)
     col                          ..F.A.... Columbia
     emi                          ..F.A.... EMI
     bsi                          ..F.A.... BSI (78RPM)
     riaa                         ..F.A.... RIAA
     cd                           ..F.A.... Compact Disc (CD)
     50fm                         ..F.A.... 50µs (FM)
     75fm                         ..F.A.... 75µs (FM)
     50kf                         ..F.A.... 50µs (FM-KF)
     75kf                         ..F.A.... 75µs (FM-KF)


