Encoder libx265 [libx265 H.265 / HEVC]:
    General capabilities: delay threads 
    Threading capabilities: auto
    Supported pixel formats: yuv420p yuv422p yuv444p gbrp gray
libx265 AVOptions:
  -crf               <float>      E..V..... set the x265 crf (from -1 to FLT_MAX) (default -1)
  -forced-idr        <boolean>    E..V..... if forcing keyframes, force them as IDR frames (default false)
  -preset            <string>     E..V..... set the x265 preset
  -tune              <string>     E..V..... set the x265 tune parameter
  -profile           <string>     E..V..... set the x265 profile
  -x265-params       <string>     E..V..... set the x265 configuration using a :-separated list of key=value parameters


