@eMarketer expects US digital video ad spending to increase by 33.8% in 2015 and continue to grow by double-digits until at least 2019. More specifically, video ad spending is expected to double from $7.77B this year to $14.38B in 2019. However, eMarketer found that buyers don’t believe standards for ad viewability (whether an ad is within the user’s view when it’s playing) are strict enough while suppliers do. Moat found that viewability rates for 15- and 30-second video ads in Q4 2014 worldwide hovered around 51% based on a 2-second in-view rate. Thus, ~50% of video ads are viewable, validating buyer concerns that they are paying for ads that are not being seen. - Link