You are probably using the IRremote library [Link: github.com] on your Arduino, right. This has its own parametrization of the common IR protocol. Either you can install a better one, or you can try to interpret IRremote's parameters.

For the first option, using the Arduino IDE and its library manager, download AGirs. You probably do not have a non-demodulating receiver, so do not define CAPTURE in the configuration file. You can then hook it up to IrScrutinizer for analyzing the result directly.

Second option (If you want to use IRremote), first take note of the name of the protocol it spits out. After you have told us which it is, I can tell you how to proceed.