ffmpeg –help encoder=hevc_qsv

Encoder hevc_qsv [HEVC (Intel Quick Sync Video acceleration)]:
    General capabilities: delay hybrid 
    Threading capabilities: none
    Supported hardware devices: qsv qsv qsv 
    Supported pixel formats: nv12 p010le qsv
hevc_qsv encoder AVOptions:
  -async_depth       <int>        E..V....... Maximum processing parallelism (from 1 to INT_MAX) (default 4)
  -avbr_accuracy     <int>        E..V....... Accuracy of the AVBR ratecontrol (unit of tenth of percent) (from 1 to 65535) (default 1)
  -avbr_convergence  <int>        E..V....... Convergence of the AVBR ratecontrol (unit of 100 frames) (from 1 to 65535) (default 1)
  -preset            <int>        E..V....... (from 1 to 7) (default medium)
     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.......
  -rdo               <int>        E..V....... Enable rate distortion optimization (from -1 to 1) (default -1)
  -max_frame_size    <int>        E..V....... Maximum encoded frame size in bytes (from -1 to 65535) (default -1)
  -max_slice_size    <int>        E..V....... Maximum encoded slice size in bytes (from -1 to 65535) (default -1)
  -bitrate_limit     <int>        E..V....... Toggle bitrate limitations (from -1 to 1) (default -1)
  -mbbrc             <int>        E..V....... MB level bitrate control (from -1 to 1) (default -1)
  -extbrc            <int>        E..V....... Extended bitrate control (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)
  -b_strategy        <int>        E..V....... Strategy to choose between I/P/B-frames (from -1 to 1) (default -1)
  -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)
  -idr_interval      <int>        E..V....... Distance (in I-frames) between IDR frames (from -1 to INT_MAX) (default 0)
     begin_only      -1           E..V....... Output an IDR-frame only at the beginning of the stream
  -load_plugin       <int>        E..V....... A user plugin to load in an internal session (from 0 to 2) (default hevc_hw)
     none            0            E..V.......
     hevc_sw         1            E..V.......
     hevc_hw         2            E..V.......
  -load_plugins      <string>     E..V....... A :-separate list of hexadecimal plugin UIDs to load in an internal session (default "")
  -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)
  -profile           <int>        E..V....... (from 0 to INT_MAX) (default unknown)
     unknown         0            E..V.......
     main            1            E..V.......
     main10          2            E..V.......
     mainsp          3            E..V.......
     rext            4            E..V.......
  -gpb               <boolean>    E..V....... 1: GPB (generalized P/B frame); 0: regular P frame (default true)
  -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)
  -recovery_point_sei <int>        E..V....... Insert recovery point SEI messages (from -1 to 1) (default -1)
  -aud               <boolean>    E..V....... Insert the Access Unit Delimiter NAL (default false)