How iPad screen gameplay is captured? In some video such as

http://www.youtube.com/watch?v=csjXiu9HLrA

I see that it looks like the iPad video is captured... but it is also said that the Component cable for iPad only works for movies and photos, but not for apps...  so how can it be done?
It's likely the video was captured using the iOS development emulator rather than the actual iPad itself.