HDMI is a complete audio and video digital signal, designed for HDTV connections. In normal circumstances HDMI can transmit the digital signals without any problems, however, extended lengths present problems. Extending HDMI signals is possible using active self powered HDMI boosters or active Cat5e/Cat6 extenders over economical Cat5e/Cat6 cables. Fiber Optic Extenders and Wireless extenders are also available. Please test all in-wall cabling with the actual sources and displays before permanently installing.
Learn : Getting that HDMI to go a Little Bit Farther (Extenders)