What does this FFMPEG input mean?

[Guernsey]

This is little embarrassing but what does this "scale=iw*X:ih*X" mean? Do I have to put in the actual width and height or just factor like for example iw*4:ih*4?

[october262]

This is little embarrassing but what does this "scale=iw*X:ih*X" mean? Do I have to put in the actual width and height or just factor like for example iw*4:ih*4?

see here - https://trac.ffmpeg.org/wiki/Scaling it's a scale filter

[jagabo]

iw and ih the width and height of the input video. So iw*X:ih*X is multiplying the width and height by the same amount, X. So yes, scael=iw*4:ih*4 will result in a video that 4x the width and height of the original. If the original was 640x480 the output will be 2560x1920. Alternatively, you could multiply the values yourself and specify scale=2560:1920.

[Guernsey]

Oh thanks. To be honest, I forgot about some of this due to my brain being tired.