Lower the resolution of your source video to match the actual pixel dimensions of your LED wall.
) is a popular asynchronous controller used for single and dual-color LED signs. It typically connects via USB and supports up to 14 languages. X Show LED Editor (also known as Xshow).
If you can tell me the printed on your board or the approximate size of your LED sign, I can give you the exact configuration settings to use. XSHOW XC2 RGB LED Controller - USB - Micro Robotics