ffmpeg -i "Path of Exile 2018-10-07 14-31-45.mp4" -vf scale=3840x2160 -b:v 18000k -minrate 9000k -maxrate 26100k -tile-columns 4 -g 240 -quality good -crf 15 -c:v libvpx-vp9 -c:a libopus -pass 1 -speed 4 tos-3840x2160-50-60fps.webm
ffmpeg -i "Path of Exile 2018-10-07 14-31-45.mp4" -vf scale=3840x2160 -b:v 18000k -minrate 9000k -maxrate 26100k -tile-columns 4 -g 240 -quality good -speed 4 -crf 15 -c:v libvpx-vp9 -c:a libopus -pass 2 -y tos-3840x2160-50-60fps.webm