$ ffmpeg -h filter=scale -hide_banner | sed -ne '/SWScaler/,$ p'
SWScaler AVOptions:
  -sws_flags         <flags>      E..V.... scaler flags (default 4)
     fast_bilinear                E..V.... fast bilinear
     bilinear                     E..V.... bilinear
     bicubic                      E..V.... bicubic
     experimental                 E..V.... experimental
     neighbor                     E..V.... nearest neighbor
     area                         E..V.... averaging area
     bicublin                     E..V.... luma bicubic, chroma bilinear
     gauss                        E..V.... gaussian
     sinc                         E..V.... sinc
     lanczos                      E..V.... lanczos
     spline                       E..V.... natural bicubic spline
     print_info                   E..V.... print info
     accurate_rnd                 E..V.... accurate rounding
     full_chroma_int              E..V.... full chroma interpolation
     full_chroma_inp              E..V.... full chroma input
     bitexact                     E..V....
     error_diffusion              E..V.... error diffusion dither
  -srcw              <int>        E..V.... source width (from 1 to INT_MAX) (default 16)
  -srch              <int>        E..V.... source height (from 1 to INT_MAX) (default 16)
  -dstw              <int>        E..V.... destination width (from 1 to INT_MAX) (default 16)
  -dsth              <int>        E..V.... destination height (from 1 to INT_MAX) (default 16)
  -src_format        <int>        E..V.... source format (from 0 to 339) (default 0)
  -dst_format        <int>        E..V.... destination format (from 0 to 339) (default 0)
  -src_range         <int>        E..V.... source range (from 0 to 1) (default 0)
  -dst_range         <int>        E..V.... destination range (from 0 to 1) (default 0)
  -param0            <double>     E..V.... scaler param 0 (from INT_MIN to INT_MAX) (default 123456)
  -param1            <double>     E..V.... scaler param 1 (from INT_MIN to INT_MAX) (default 123456)
  -src_v_chr_pos     <int>        E..V.... source vertical chroma position in luma grid/256 (from -513 to 512) (default -513)
  -src_h_chr_pos     <int>        E..V.... source horizontal chroma position in luma grid/256 (from -513 to 512) (default -513)
  -dst_v_chr_pos     <int>        E..V.... destination vertical chroma position in luma grid/256 (from -513 to 512) (default -513)
  -dst_h_chr_pos     <int>        E..V.... destination horizontal chroma position in luma grid/256 (from -513 to 512) (default -513)
  -sws_dither        <int>        E..V.... set dithering algorithm (from 0 to 6) (default 1)
     auto                         E..V.... leave choice to sws
     bayer                        E..V.... bayer dither
     ed                           E..V.... error diffusion
     a_dither                     E..V.... arithmetic addition dither
     x_dither                     E..V.... arithmetic xor dither
  -gamma             <int>        E..V.... gamma correct scaling (from 0 to INT_MAX) (default 0)
     true                         E..V.... enable
     false                        E..V.... disable
  -alphablend        <int>        E..V.... mode for alpha -> non alpha (from 0 to 2) (default 0)
     none                         E..V.... ignore alpha
     uniform_color                E..V.... blend onto a uniform color
     checkerboard                 E..V.... blend onto a checkerboard