QuickTime

Quicktime is an Apple developed multimedia technology that is cross platform and allows for use of video, animation, sound, graphics, interactivity, and music. Its supports many different formats, compression schemes for images and video of all kinds.

Core Audio

Core Audio is a system level service that aids in developing apps that incorporate audio. It allows native multi-channel audio and is scaleable for high resolution formats that may come out in the future.

Core Image

Core Image is an image processing technology that started with Mac OS 10.4 (Tiger). Its an API that provides access to imaging filters for both video and still images and also allows for custom filters as well as almost real time processing.

Core Video

Core Video is an easy way to get frames from any video source and filter or transform them using either OpenGL or Core Image.

OpenGL

OpenGL is an industry standard for 2D and 3D graphics. In Mac OS X its the primary way to getting graphics to the GPU (Graphics processor). Its purpose is to support all kinds of high performance graphics from CAD, and medical, to gaming applications.