Encoder libwebp [libwebp WebP image]:
    General capabilities: none
    Threading capabilities: none
    Supported pixel formats: bgra yuv420p yuva420p
libwebp AVOptions:
  -lossless          <int>        E..V..... Use lossless mode (from 0 to 1) (default 0)
  -preset            <int>        E..V..... Configuration preset (from -1 to 5) (default none)
     none                         E..V..... do not use a preset
     default                      E..V..... default preset
     picture                      E..V..... digital picture, like portrait, inner shot
     photo                        E..V..... outdoor photograph, with natural lighting
     drawing                      E..V..... hand or line drawing, with high-contrast details
     icon                         E..V..... small-sized colorful images
     text                         E..V..... text-like
  -cr_threshold      <int>        E..V..... Conditional replenishment threshold (from 0 to INT_MAX) (default 0)
  -cr_size           <int>        E..V..... Conditional replenishment block size (from 0 to 256) (default 16)
  -quality           <float>      E..V..... Quality (from 0 to 100) (default 75)


