That's high demand for the hardware (CPU & GPU) and x265 HEVC processing software. However, the high video compression efficiency also means increased computational complexity - it requires roughly 10x more compute power than H264. So HEVC is the best choice to encode high-def video, especially 4K and 8K Ultra HD videos. Compared to H.264, H.265 approximately doubles the compression ratio. HEVC (High Efficiency Video Coding)/H.265 is a new video compression standard related greatly to high quality of videos. Part 1: About HEVC Codec - Why You Need A HEVC Player?
Part 2: Best 5 Free HEVC Players for Windows / Mac.