260708-10bitHDR转为8bitSDR

#! pwsh.exe
# 使用ffmpeg将10bitHDR转换成8bitSDR
# 全程使用硬件解码 硬件处理 硬件编码, 画质优化与metadata更新
ffmpeg -y -hide_banner `
-hwaccel cuda -init_hw_device vulkan=vk -filter_hw_device vk `
-i "TWICE-I_CAN'T_STOP_ME-10bitHDR.webm" `
-vf "hwupload,libplacebo=tonemapping=bt.2446a:gamut_mode=perceptual:dithering=blue:colorspace=bt709:color_primaries=bt709:color_trc=bt709:format=nv12:contrast_recovery=0.3:peak_detect=1,hwdownload,format=nv12,sidedata=delete" `
-c:v av1_nvenc -rc vbr -cq 24 -b:v 0 -maxrate 38400k -bufsize 76800k `
-rc-lookahead 32 -bf 3 -b_ref_mode middle -sc_threshold 0 -tune hq -multipass fullres -spatial-aq 1 -temporal-aq 1 -preset p7 -g 240 `
-color_primaries bt709 -color_trc bt709 -colorspace bt709 `
-c:a copy `
-map_metadata -1 -map_metadata:s:v -1 `
"output.mkv"