transcoded with

ffmpeg -i "Riding.mp4" -map 0:v:0 -map 0:a:0 -c:v libvpx-vp9 -b:v 13665k -speed 4 -pass 1 -an -f webm -y NUL && ffmpeg -i "Riding.mp4" -map 0:v:0 -map 0:a:0 -c:v libvpx-vp9 -b:v 13665k -speed 0 -auto-alt-ref 1 -lag-in-frames 25 -row-mt 1 -tile-columns 2 -pass 2 -c:a libopus -b:a 128k -y "Riding.webm"