Measuring brand-lift around real-time online video advertising is an essential tools for brands, says Sean O'Neal, president of the San Francisco-based analytics firm Vizu, in this interview with Beet.TV. Vizu works with a number of video advertising solution providers. Today, it announced and its real-time solution has been integrated into the Adap.tv marketplace. O'Neal was participant in Tuesday's Beet.TV Summit on Video Engagement. We spoke with him before the session.