Video: Capture Device
If you have more than one video capture device in your computer, you can
select which one you want to use by clicking on the pull-down menu.
The Format, Source, and Display buttons behave differently for each brand of
video device. Typically they will launch the configuration screen for your video
camera; for some cameras all of the buttons launch the same screen. The
configuration screen lets you adjust brightness, contrast, clipping, and other
camera-specific options.