*I think* one way around it is to work in pixels instead of percents.
But then it needs to still work with all frame sizes from 720p to 4k.
I'm not really liking how this preset works now in actual practice.
It's harder than it should be to use.
What I think would be better is if it was center aligned so setting param to 0.5 is middle of video. Then change width and height from that point.
Param1 x position
Param2 y position
param3 width
param4 height
|