A unamed fastfood chain in Belgium displays its menu with accompanying advertising clips digitally above the cash registers. We ensured that these 700 screens were controlled with a Raspberry Pi each. We chose this solution because often the internet was not optimal in the chain. So just streaming was definitely not a solution. The Raspberry Pi downloads the content in advance and plays the movies and menu cards according to a certain script that the editors impose.
So if the chain wanted to sell more milkshakes at 5 p.m. then the system would show more milkshakes around that hour.
An additional problem was that the prices in the movies had to be adjusted dynamically. For example when it is low time. Or in a busy place the movies should show a different price depending on location and time. To streamline this we have devised a system where the prices are dynamically rendered on the server and then distributed to one of the 700 Raspberry Pi in the store.