ffmpeg -h encoder=apv_vulkan

apv_vulkan.txt

Encoder apv_vulkan [Advanced Professional Video (Vulkan)]:
    General capabilities: dr1 delay hardware reorderedopaque flush 
    Threading capabilities: none
    Supported hardware devices: vulkan 
    Supported pixel formats: vulkan
apv_vulkan AVOptions:
  -qp                <int>        E..V....... Quantization parameter (luma) (from 0 to 255) (default 22)
  -qp_chroma         <int>        E..V....... Chroma quantization parameter (0 = same as luma qp) (from 0 to 255) (default 0)
  -qmatrix           <int>        E..V....... Quantization matrix (from 0 to 1) (default hevc)
     flat            0            E..V....... Uniform matrix, all 16 (APV spec default)
     hevc            1            E..V....... HEVC default intra scaling list (mild perceptual shaping)
  -tile_width        <int>        E..V....... Tile width in macroblocks (0 = adaptive, auto-sized per frame) (from 0 to 32) (default 0)
  -tile_height       <int>        E..V....... Tile height in macroblocks (0 = adaptive, auto-sized per frame) (from 0 to 16) (default 0)
  -async_depth       <int>        E..V....... Internal parallelization depth (from 1 to INT_MAX) (default 1)