See the next post for how to do this transition wholly in Shotcut.
I’ve put together an HTML file that accepts various parameters and transitions two images as if shrinking the image to a small circle flipping it and then expanding the circle. Play around with them and see what you can come up with. You need to provide it with two or more images.
I have an example below and the HTML file is also below, just remove the ‘.txt’ suffix and run it in a browser and use screen-recording software, like Sharex, to record it.
Or, run it as a “Browser Source” in OBS Studio, recording the animation and then open this clip in Shotcut.
It should be possible to do this wholly in Shotcut using various filters. Would anyone care to try?
To answer my own question: “YES it can be done with a simple transition and a Mask:Simple-Shape filter”.
Here is a ZIP file with the images and the MLT file. The first and last clips are 6 secs long, the one in the middle is 9 secs long, the transition overlaps are 3 seconds long and the transition is a “Cut at 50%” one.