Looking for a script or plugin that would remove 2 out of every 3 frames (4 out of 5; 5 out of 6....)
and wile keeping clip duration the same would fill the gaps by interpolating between reaming frames.
Ideally it would be a smart frame blending but i would settle for straight mix.
The result would look exactly the same as if you time-stretch the clip by (let's say) 25% and then after rendering and re-importing would stretch it back to fit original length (400%) with frame blending on.
But without prerendering and re-importing.
Now, i'm fairly certain that no standard remapping tools in AE as well as effects under "time" category could achieve that.
Seem like a simple task. But i can't think of good keywords to use to look for it.