Some years ago I ran a buildroot environment on RPi(2) with Qt5 (eglfs) without X. I was launching omxplayer and it worked flawlessly on the "top" of my QML application (I know there is no a "top" with framebuffer...).
Now I'm doing the same thing with Rasbian Jessie Lite and it doesn't work. When I launch omxplayer I hear the sound but no video. It works only if I start my application without any GUI.
Is there something to do in Rasbian to "release" the fb, or to temporary set it to another application?