Use ffmpeg to resize image

问题:

Is it possible to resize an image using FFMPEG?

I have this so far:

ffmpeg. -i 1.jpg -vf scale=360:240 > 2.jpg

I get the error message that 'At least one output file must be specified'

Is it possible?

回答1:

You can try this:

ffmpeg -i input.jpg -vf scale=320:240 output_320x240.png

I got this from source

Note: The scale filter can also automatically calculate a dimension while preserving the aspect ratio: scale=320:-1, or scale=-1:240

回答2:

If you want to retain aspect ration you can do -

./ffmpeg -i 1.jpg -vf scale="360:-1" 2.jpg

or if you want to resize based on input width and height. Eg. lets 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