ffmpeg -i input.mp4 -c:v libx264 -crf 18 -pix_fmt yuv420p -s 1280x720 -x265-params "pass=1" -f mp4 NUL && ffmpeg -i input.mp4 -c:v libx264 -crf 18 -pix_fmt yuv420p -s 1280x720 -x265-params "pass=2" output.mp4
If you want, I can: