Yes the idea is to have the same qml file ( more or less - I'm still investigating if this is possible ) on each device and each device renders the part for its screen.
I think this is easily achievable when the qml has static parts and no animation. I trying to figure out how to make it work when you have animation, simple example: a square that moves horizontally from one to screen to the next...
In my example I have a timer that every second moves the rectangle of 10pixel to the right, to make everything work I need to have the two timers of the two devices synchronized... and this is what I'm trying to look in the sources of Qt....
Your idea could be a solution, do you think its feasible? The problem is that when you have a big videowall ( 3x3 or 4x4 ) I don't think a single computer has the power to render at a decent frame rate the whole setup..