Filter aformat
  Convert the input audio to one of the specified formats.
    Inputs:
       #0: default (audio)
    Outputs:
       #0: default (audio)
aformat AVOptions:
  sample_fmts       <string>     ..F.A.... A '|'-separated list of sample formats.
  sample_rates      <string>     ..F.A.... A '|'-separated list of sample rates.
  channel_layouts   <string>     ..F.A.... A '|'-separated list of channel layouts.


