We didn’t see specifically which IR receiver he’s using, but many require some type of filtering so check the suggested layout in the datasheet for your module.

The IR Transmitter and Receiver Extends IR signal using a repeater also know as IR repeater kit. Upgraded- with a Dual Freq IR Receiver for the latest in technology in Audio and Video Controls IR ...

Using very low data rates, typically no more than 1,000 bits/sec, infrared remotes send a different code for each function on the TV, DVD, A/V receiver, etc. There are hundreds of remote control ...