Filter abuffersink
  Buffer audio frames, and make them available to the end of the filter graph.
    Inputs:
       #0: default (audio)
    Outputs:
        none (sink filter)
abuffersink AVOptions:
  sample_fmts       <binary>     ..F.A.... set the supported sample formats
  sample_rates      <binary>     ..F.A.... set the supported sample rates
  channel_layouts   <binary>     ..F.A.... set the supported channel layouts
  channel_counts    <binary>     ..F.A.... set the supported channel counts
  all_channel_counts <boolean>    ..F.A.... accept all channel counts (default false)


