When advertising spend for digital video doubles to $12 billion by 2018 in the U.S., half of that will be around mobile platforms, says David Hallerman, Principal Analyst at eMarketer, in this interview with Beet.TV.  By mobile, he means both wi-fi-connected devices and phone devices connect via cellular.

We spoke with him about the growth of video ad spending as well as the emerging opportunities around targeted and addressable advertising.

We interviewed him at the VideoNuze summit in New York on Wednesday, where he was a featured speaker.