How many gigabytes will a one hour video shot on SP using Mini DV Video camera take?

You can figure approximately 4.7 gigabytes for a 2 hour DVD and around 10 megabytes per second for a 3 minute video, on average.

There's really too many factors to consider, like full video encoding or some other type of compression like DivX to take into consideration, so truthfully, it's hard to be exact. If you have them stored on your computer, go to the file, highlight it and right click. Then go to the properties tab and it'll tell you how large it is.

Actually, ussualy a 2 hour movie(mp4 format) is about 0.8 gigabytes.(800 megabytes)

And a music video is like 40 megabytes.