Video Codec is the Vision Pro's main processing unit. It's what makes certain you always get a great picture. Simply, the Vision Pro's Video Codec, working in concert with the codec on the other end, digitizes the video to create output that's as clear as the picture you get off your home TV or VCR. Further, it has a very small footprint, so it's easy to install and connect and can be used with any size video monitor or projector with video input.