FFMPEG

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Resize Image

Resize With only, keep height same ratio

ffmpeg -i input.jpg -vf scale=1280:-1 output.jpg

or if you want to resize based on input width and height, let's say half of input width and height you can do -

ffmpeg -i 1.jpg -vf scale="iw/1:ih/2" 2.jpg

where

iw: input width
ih: input height