It sounds like you're looking to update a player for H265X files—which are commonly H.265 (HEVC) encoded video files used in surveillance systems—or you need a way to play them while adding text overlays. Updating Your Player for H265X
optimized for hardware-accelerated decoding and HDR10 support. MPC-HC (Home Cinema) h265x player upd
It seems you are asking for an update guide regarding an H.265 (HEVC) player, or you are seeing a prompt for an update in a specific software and want to know what to do. It sounds like you're looking to update a
Stuttering Video: High-efficiency video is CPU-intensive. Check your player settings to enable Hardware Acceleration (usually found under Video/Output settings). 10-bit color depth HDR10 and Dolby Vision Higher