Filter atrim
  Pick one continuous section from the input, drop the rest.
    Inputs:
       #0: default (audio)
    Outputs:
       #0: default (audio)
atrim AVOptions:
  start             <duration>   ..F.A.... Timestamp of the first frame that should be passed (default INT64_MAX)
  starti            <duration>   ..F.A.... Timestamp of the first frame that should be passed (default INT64_MAX)
  end               <duration>   ..F.A.... Timestamp of the first frame that should be dropped again (default INT64_MAX)
  endi              <duration>   ..F.A.... Timestamp of the first frame that should be dropped again (default INT64_MAX)
  start_pts         <int64>      ..F.A.... Timestamp of the first frame that should be  passed (from I64_MIN to I64_MAX) (default I64_MIN)
  end_pts           <int64>      ..F.A.... Timestamp of the first frame that should be dropped again (from I64_MIN to I64_MAX) (default I64_MIN)
  duration          <duration>   ..F.A.... Maximum duration of the output (default 0)
  durationi         <duration>   ..F.A.... Maximum duration of the output (default 0)
  start_sample      <int64>      ..F.A.... Number of the first audio sample that should be passed to the output (from -1 to I64_MAX) (default -1)
  end_sample        <int64>      ..F.A.... Number of the first audio sample that should be dropped again (from 0 to I64_MAX) (default I64_MAX)


