To d-Raven-b - I use a DJI Phantom 4 Pro and had the same problem as you with 4K playback, but Nephele's solution above fixed this for me - selecting the "DirectX Video Acceleration (DXVA) 2.0" option [WIN10-64]. However, note that I am using the DJI 4K-H264 option, not H265 - could make a...