Docs: https://trac.ffmpeg.org/wiki/Encode/VP9
INPUT="video.mov"
OUTPUT="converted-video.webm"
CPUS=4 # Adjust the number of cores your CPU have
FRAMERATE=15 # Adjust for your needs
VARIABLE_BITRATE=100K # Adjust for your needs, can be represented as 1M, 1000k, etc.