'FFMEG option scale=-1 and scale=-2

I tried to convert a video and resize it with scale=-1:720, but got the error "width not divisible by 2". And I solved it with: scale=-2:720. What are the differences between

scale=-1:720

and

scale=-2:720
ffmpeg


Solution 1:[1]

If you think about -1 and -2 like about -n then this sets the specified dimension (width, height) to be a multiple of n.

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