4k Blue-ray how to down-convert to 2k@30 or 1k@60?

Hi guys, I've just installed hdmi qam modulator for iptv streaming, tried it out with DVD player - works just fine, but I want to stram video from my blue ray, the problem is that modulator supports high-end h264 encoding up to 1080p@60, blue ray outputs 4K, is there any down-coverters os anything similar? What is your suggestion, guys?