I'm not dealing with huge displays and stuff, but I think that idea behind Pixblaster is worth of attention to one who is dreaming about video kiosk or panel. I had opportunity recently to met in person both authors (Gordan and Goran) and can say that they are very serious and seasoned engineers and I'm confident that they'll deliver what is presented (and promised).
The campaign is about to end, with only 4 days left, see if you find it interesting:
https://www.crowdsupply.com/pixblasters/video-led-controller