However, with these high growth rates over five years, video advertising will still be a niche. It represents 3.6 percent of the total ad spend this year, and still less than 10 percent in five years. "Looking over the numbers, it is not difficult to see how even a small shift in TV ad spending will be a driving force in overall Internet ad spending gains. Video will be behind the wheel," said David Hallerman, eMarketer Senior Analyst.