ffmpeg -i studio_s01e01.mov -c:v libvpx-vp9 -b:v 1500k -crf 30 -row-mt 1 -threads 4 -speed 2 -tile-columns 2 -frame-parallel 1 -auto-alt-ref 1 -lag-in-frames 25 -pix_fmt yuv420p -pass 2 -c:a libopus -b:a 128k output.webm