I want to make a horizontal video get converted to vertical video using FFMPEG for automation purposes. I tried with this, which works for vertical to horizontal

    ffmpeg -i input.mp4 \
  -vf 'split[original][copy];[copy]scale=ih*16/9:-1,crop=h=iw*9/16,gblur=sigma=20[blurred];[blurred][original]overlay=(main_w-overlay_w)/2:(main_h-overlay_h)/2' \

And tried to change the "16/9" and "9/16" parameters backwards so it makes the reverse procedure, but i get an error.

I don't really need the blur thing, because i want to put some images on the black boxes that will result from doing this process.

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