Using conditional filters in FFmpeg

You can use max:

max(x, y)
Return the maximum between x and y.

Example:

ffmpeg -i input -vf "scale=-1:'max(720,ih)'" output

If I wanted to replace the -1 with a $width variable in my script, would there be a way to ensure that $width is only acted on when the right side (i.e. height) is also upscaled?

Example using if and lt:

ffmpeg -i input -vf "scale='if(lt(ih,720),$width,iw)':'max(720,ih)'" output

Using conditional filters in FFmpeg

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