Thanks a lot to everybody for the fast answers!!
And Keno40, Grazie Mille for the PNGs.
I am an editor in TV, i used to work in avid, final cut, premiere...
But for a seminary with student's project, I need this because it is a free software and multiplatform.
For a lot of reasons, Shotcut is a wonderful project, and a nice and romantic idea, and I hope someday it will become a great program that many people use.
But right now it's too young and half-finished software. And if above, we add to this that I already have the head very squared for the professional NLE systems... This seminary is being a pain in my ass !! Ahahah
Again, thanks for the help to everybody !!