Have you read these?
https://www.google.com/search?domains=https%3A%2F%2Fforum.arduino.cc&ei=-Vy3XNS3DdjH-gSfprWAAg&q=ws2812b+ir+remote+site%3Ahttps%3A%2F%2Fforum.arduino.cc&oq=ws2812b+ir+remote+site%3Ahttps%3A%2F%2Fforum.arduino.cc&gs_l=mobile-gws-wiz-serp.3...15057.20109..25218...1.0..0.77.375.5......0....1.ZNnfFiBY118