What is the difference between “Overlay” and “Preview” windows?
When the Buz is capturing or preparing to capture video, you can have a window on your computer monitor to watch what is coming in. (The NTSC output also shows a copy). This window can be created using one of two very different methods: Preview The Preview method is the most basic. The video application (or API) instructs the Buz to capture a single frame, and then it immediately draws it into the preview window. It does this repeatedly, as fast as it can. In most cases, you can limit the update rate to keep it from completely consuming your CPU. As you might guess, this is a very intensive process, since each frame must be handled in software and transfered from the Buz to the CPU to the Video card. It’s so intensive, it’s very possible that it interferes with your capturing! Overlay Overlay is the better alternative because it’s more direct and automated. The video application instructs the Buz to “put an overlay window over there, this big”. Then the Buz is pretty much on autopilot!
