ffmpeg -h encoder=av1_qsv

av1_qsv.txt

Encoder av1_qsv [AV1 (Intel Quick Sync Video acceleration)]:
    General capabilities: delay hybrid 
    Threading capabilities: none
    Supported hardware devices: qsv qsv qsv 
    Supported pixel formats: nv12 p010le qsv
av1_qsv encoder AVOptions:
  -async_depth       <int>        E..V....... Maximum processing parallelism (from 1 to INT_MAX) (default 4)
  -preset            <int>        E..V....... (from 0 to 7) (default 0)
     veryfast        7            E..V.......
     faster          6            E..V.......
     fast            5            E..V.......
     medium          4            E..V.......
     slow            3            E..V.......
     slower          2            E..V.......
     veryslow        1            E..V.......
  -forced_idr        <boolean>    E..V....... Forcing I frames as IDR frames (default false)
  -low_power         <boolean>    E..V....... enable low power mode(experimental: many limitations by mfx version, BRC modes, etc.) (default auto)
  -b_strategy        <int>        E..V....... Strategy to choose between I/P/B-frames (from -1 to 1) (default -1)
  -adaptive_i        <int>        E..V....... Adaptive I-frame placement (from -1 to 1) (default -1)
  -adaptive_b        <int>        E..V....... Adaptive B-frame placement (from -1 to 1) (default -1)
  -extbrc            <int>        E..V....... Extended bitrate control (from -1 to 1) (default -1)
  -low_delay_brc     <boolean>    E..V....... Allow to strictly obey avg frame size (default auto)
  -max_frame_size    <int>        E..V....... Maximum encoded frame size in bytes (from -1 to INT_MAX) (default -1)
  -max_frame_size_i  <int>        E..V....... Maximum encoded I frame size in bytes (from -1 to INT_MAX) (default -1)
  -max_frame_size_p  <int>        E..V....... Maximum encoded P frame size in bytes (from -1 to INT_MAX) (default -1)
  -profile           <int>        E..V....... (from 0 to INT_MAX) (default unknown)
     unknown         0            E..V.......
     main            1            E..V.......
  -tile_cols         <int>        E..V....... Number of columns for tiled encoding (from 0 to 65535) (default 0)
  -tile_rows         <int>        E..V....... Number of rows for tiled encoding (from 0 to 65535) (default 0)
  -look_ahead_depth  <int>        E..V....... Depth of look ahead in number frames, available when extbrc option is enabled (from 0 to 100) (default 0)