Thanks for that Dovlahkin,
If it is not possible to offset a video I will need to do few different video and plug several media player to different plane.
Now I did indeed use the flipbook as for me it was one of the best solution to be able to do what I want.
But I am stuck with the way to randomly start the flipbook.
I’ve found how to change the speed but not really a way to start the flipbook from a different frame.
Do you think it is possible?
I understand, I guess, the scalar parameter that will be applied randomly to different material, but not how to build it inside my material to be able to have that node affecting an offset.
So far I have my flipbook texture and that material.
Thanks again for your help