There no " soft borders " associated with the crop in motion, (like in Fcp)
I found a way when I wan't to soft the border of... say: a picture in picture - I copy the croped image upon itself , blur the bottom one and add a mask in order to make it visible on the borders, then the mask borders can be softened either towards the outside OR the inside, (there is no centered)
I guess there must be a more simple way to soften the edges of a crop
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A Day late & a Dollar-short Productions