Went to Reddit looking for this desired video effect.
Doesn’t seems like kdenlive can achieve a distorted frame WITH the frame edges adjusted to defined curves. However, I feel as though all the mechanisms needed for this are found in two other effects that do exist currently.
The four corners transform gets very close to this desired effect, but the frame edges are still straight lines defined by two points.
The rotoscope effect, however, can easily create the kind of defined curves that I’m looking for as a mask. But there doesn’t seem to be a way to get the frame to distort to that mask.
Someone in that Reddit post mentioned I should post here, so here I am.