Encoder opus [Opus]:
    General capabilities: delay small exp 
    Threading capabilities: none
    Supported sample rates: 48000
    Supported sample formats: fltp
    Supported channel layouts: mono stereo
Opus encoder AVOptions:
  -opus_delay        <float>      E...A..... Maximum delay in milliseconds (from 2.5 to 360) (default 360)
  -apply_phase_inv   <boolean>    E...A..... Apply intensity stereo phase inversion (default true)


