-vn -c:a libvorbis -ac 2 -ar 48000 -ab 128k -map_metadata -1 -map_chapters -1 -af "loudnorm=I=-16:TP=-2:LRA=10,highpass=40,lowpass=16000"
ffmpeg -i asd.mp4 -c:v libvpx-vp9 -b:v 0 -crf 30 -c:a libopus -b:a 128k -af "loudnorm=I=-16:TP=-2:LRA=10,highpass=20,lowpass=18000" -t 8 output.webm