brew install ffmpeg
ffmpeg -i video-original.mp4 -vcodec h264 -acodec mp2 video.mp4
ffmpeg -i video-original.mp4 -c:v libvpx-vp9 -crf 30 -b:v 0 -b:a 128k -c:a libopus video.webm
brew install ffmpeg
ffmpeg -i video-original.mp4 -vcodec h264 -acodec mp2 video.mp4
ffmpeg -i video-original.mp4 -c:v libvpx-vp9 -crf 30 -b:v 0 -b:a 128k -c:a libopus video.webm
Nice.