I’ve found a couple of open source apps for the Mac that support tweening as well as frame animation. They are free (good) and a little on the confusing side with so many options (bad). I’ve watched your video on iMovie animating of videos—resizing and moving to a corner, for example—but wonder if there’s a possibility of tweening in iMovie? The common beginner example is a ball bouncing.
Otherwise, do you have a super suggestion for a separate animation app **that tweens**? Frame-to-frame redrawing for me is unappealing, as I’m no artist.