@ANIE
If you want to try making the page turn transition, it’s not necessary to export a video for it to work.
You can create the first set of transitions and save as a project. Then in your main project assemble the images/videos and open the previously saved project as an XML/MLT clip and use it for the transitions.
Here’s a project that you can look at.
Page Curl 00 is the project where the black is keyed out. Then in Page Curl Video the Page Curl 00 project is opened as a clip and the green is keyed out…
Page Curl Transition.zip (2.9 MB)