# PASS 1
ffmpeg -y -i in.mp4 \
-vf "scale=1080:1920:flags=lanczos,format=yuv420p" -r 30 \
-c:v libx264 -preset slow -b:v 1100k -maxrate 1200k -bufsize 2400k \
-an -pass 1 -f mp4 /dev/null
# PASS 2
ffmpeg -i in.mp4 \
-vf "scale=1080:1920:flags=lanczos,format=yuv420p" -r 30 \
-c:v libx264 -preset slow -b:v 1100k -maxrate 1200k -bufsize 2400k \
-c:a aac -b:a 80k -ac 2 \
-movflags +faststart -pix_fmt yuv420p \
-pass 2 out_20s_3MB_1080p.mp4
https://pastebin.com/wSPNCsuy