UltraGrid from The Laboratory of Advanced Networking Technologies (ANTLab) is a software for real-time transmissions of high-defintion video. It is a fork of the original UltraGrid developed by Colin Perkins, Ladan Gharai, et al.. Our work is supported by CESNET research intent “Optical Network of National Research and Its New Applications” (MŠM 6383917201) and partially also by Masaryk University research intent “Parallel and Distributed Systems” (MŠM 0021622419).