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vp9
ffmpeg -i source.mp4 -c:v libx264 -b:v 1.5M -c:a aac -b:a 128k target.mp4
ffmpeg -i source.mp4 -c:v libvpx-vp9 -b:v 1M -c:a libopus -b:a 128k target.webm
ffmpeg -i source.mp4 -c:v libvpx-vp9 -b:v 0.33M -c:a libopus -b:a 96k \
-filter:v scale=960x540 target.webm
video scale down:
-filter:v scale=1280x720 (HD)
-filter:v scale=960x540 (qHD)