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floorin most cases since typically you're downscaling. Usingceilallowed my final video to actually be a pixel larger than the max size set. This is the command I ended up using:-vf "scale=floor(iw*min(1\,min(640/iw\,360/ih))/2)*2:-1"(You can experience what I mentioned by setting the 640 and 360 values to odd values like 643 & 301 respectively, for example.)