In our app we assume that user positioned the smartphone the way when the front camera (120fps) is on the left and the screen position is landscape (for watching video). We use it in our ML model. Can we adopt it somehow on iPhone Duo?
Not precisely sure if I've understood your question, Alex. When the inner display is positioned in landscape orientation, the front facing camera is on the right half of the screen, about halfway between the crease and the edge of the display.
The inner display camera only supports up to 60 fps.
If the iPhone is flipped around, you can use either of the "rear" cameras as front cameras. They are on the left side of the phone (where there is no display), or the outer front camera, which is co located with the outer display (facing you). But in this configuration, the outer display is in portrait orientation.