How to put this video effect of switching from one scene to another very rapidly? In many music videos, for example in T.I. feat. Lil Wayne - Wit Me music video from 1:14 - 1:17, u can see the video effect where the video switches from one scene to another very, very rapidly, syncing with that instrument/beat, what is this video effect called and how to put this video effect?
In a nutshell: put one clip on top of another, and use transparency (or opacity) property to show / hide bottom video. For example, in Sony Vegas Pro you can use Composite Level envelope (there is also an extension to do it quickly). I am sure that other NLEs have similar tools.