转自：https://developer.nvidia.com/nvidia-video-codec-sdk

NVIDIA  GPU 硬件decoder和encoder是独立于cuda cores

NVIDIA GPUs contain one or more hardware-based decoder and encoder(s) (separate from the CUDA cores) which provides fully-accelerated hardware-based video decoding and encoding for several popular codecs. With decoding/encoding offloaded, the graphics engine and the CPU are free for other operations.