Encoder ac3_fixed [ATSC A/52A (AC-3)]:
    General capabilities: none
    Threading capabilities: none
    Supported sample formats: s16p
    Supported channel layouts: mono stereo 3.0(back) 3.0 quad(side) quad 4.0 5.0(side) 5.0 2 channels (FC+LFE) 2.1 4 channels (FL+FR+LFE+BC) 3.1 5 channels (FL+FR+LFE+SL+SR) 5 channels (FL+FR+LFE+BL+BR) 4.1 5.1(side) 5.1
Fixed-Point AC-3 Encoder AVOptions:
  -per_frame_metadata <boolean>    E...A.... Allow Changing Metadata Per-Frame (default false)
  -center_mixlev     <float>      E...A.... Center Mix Level (from 0 to 1) (default 0.594604)
  -surround_mixlev   <float>      E...A.... Surround Mix Level (from 0 to 1) (default 0.5)
  -mixing_level      <int>        E...A.... Mixing Level (from -1 to 111) (default -1)
  -room_type         <int>        E...A.... Room Type (from -1 to 2) (default -1)
     notindicated    0            E...A.... Not Indicated (default)
     large           1            E...A.... Large Room
     small           2            E...A.... Small Room
  -copyright         <int>        E...A.... Copyright Bit (from -1 to 1) (default -1)
  -dialnorm          <int>        E...A.... Dialogue Level (dB) (from -31 to -1) (default -31)
  -dsur_mode         <int>        E...A.... Dolby Surround Mode (from -1 to 2) (default -1)
     notindicated    0            E...A.... Not Indicated (default)
     on              2            E...A.... Dolby Surround Encoded
     off             1            E...A.... Not Dolby Surround Encoded
  -original          <int>        E...A.... Original Bit Stream (from -1 to 1) (default -1)
  -dmix_mode         <int>        E...A.... Preferred Stereo Downmix Mode (from -1 to 3) (default -1)
     notindicated    0            E...A.... Not Indicated (default)
     ltrt            1            E...A.... Lt/Rt Downmix Preferred
     loro            2            E...A.... Lo/Ro Downmix Preferred
     dplii           3            E...A.... Dolby Pro Logic II Downmix Preferred
  -ltrt_cmixlev      <float>      E...A.... Lt/Rt Center Mix Level (from -1 to 2) (default -1)
  -ltrt_surmixlev    <float>      E...A.... Lt/Rt Surround Mix Level (from -1 to 2) (default -1)
  -loro_cmixlev      <float>      E...A.... Lo/Ro Center Mix Level (from -1 to 2) (default -1)
  -loro_surmixlev    <float>      E...A.... Lo/Ro Surround Mix Level (from -1 to 2) (default -1)
  -dsurex_mode       <int>        E...A.... Dolby Surround EX Mode (from -1 to 3) (default -1)
     notindicated    0            E...A.... Not Indicated (default)
     on              2            E...A.... Dolby Surround EX Encoded
     off             1            E...A.... Not Dolby Surround EX Encoded
     dpliiz          3            E...A.... Dolby Pro Logic IIz-encoded
  -dheadphone_mode   <int>        E...A.... Dolby Headphone Mode (from -1 to 2) (default -1)
     notindicated    0            E...A.... Not Indicated (default)
     on              2            E...A.... Dolby Headphone Encoded
     off             1            E...A.... Not Dolby Headphone Encoded
  -ad_conv_type      <int>        E...A.... A/D Converter Type (from -1 to 1) (default -1)
     standard        0            E...A.... Standard (default)
     hdcd            1            E...A.... HDCD
  -stereo_rematrixing <boolean>    E...A.... Stereo Rematrixing (default true)
  -channel_coupling  <int>        E...A.... Channel Coupling (from -1 to 1) (default auto)
     auto            -1           E...A.... Selected by the Encoder
  -cpl_start_band    <int>        E...A.... Coupling Start Band (from -1 to 15) (default auto)
     auto            -1           E...A.... Selected by the Encoder


