This uses the High-Efficiency Video Coding codec. It provides the same (or better) quality as older x264 files but at a significantly smaller file size.
Playing 1080p HEVC content requires a relatively modern processor (CPU) or a graphics card (GPU) with hardware decoding capabilities to avoid stuttering. Most devices from 2016 onwards should handle this easily. Triangle -2009-1080p.BluRay.x265.HEVC.10bit.5-1...
While the movie file is the most likely intent, "Triangle" and "Deep Piece" can also refer to: This uses the High-Efficiency Video Coding codec