digital signage display software

I am in search of a software solution for digital signage displays. Specifically, I am looking for video wall software with the capability of frequent content updating, and customizability. The software must provide full customization, not simply customizable templates or pre-made layouts. I need a solution that will enable me to design content according to the look, feel, and functionality that I desire. Also it need to be in offline and online, i want to get images and videos in it.view should be potrait and landscape