+ g\bgr\bra\bab\bbV\bVi\bid\bde\beo\boP\bPr\bro\bob\bba\bab\bbi\bil\bli\bit\bty\by (Float)
+ What portion of the time to grab video rather than
+ a screen image, between 0.0 and 1.0. Defaults to
+ 0.5, or half the time.
+
+ v\bvi\bid\bde\beo\boD\bDe\bev\bvi\bic\bce\be (Integer)
+ The number of the default video input device to
+ check first. If unspecified, the default camera
+ (from videopanel(1)) will be checked first. After
+ that, all other available video input devices will
+ be checked in order.
+
+ The first one which produces a non-black image
+ will be used. If all images are black, the others
+ will be re-checked a few times before giving up
+ and falling back to simply grabbing a desktop
+ image (but note that this takes a few seconds, so
+ if you don't actually have any video sources
+ hooked up, you should consider turning off video
+ grabbing by setting g\bgr\bra\bab\bbV\bVi\bid\bde\beo\boP\bPr\bro\bob\bba\bab\bbi\bil\bli\bit\bty\by to 0.0.)