Although pre-roll advertising, the 15-30 second ads seen before a video begins, is the dominate media form, the promise of online video advertising is much greater. The the opportunity is much more than simply repurposing television ads , as a kind of "Television 2.0." It is incumbent on the industry to be more creative.These were some of the comments in by panelists in this excerpt from the Beet.TV Online Video Roundtable. This section was moderated by Ad Age's Michael Learmonth. Participants in this clip include Micheal Mathieu, CEO of video ad network YuMe, Rob Norman, CEO of WPP's GroupM, Robert Davis of Ogilvy and John McCarus of Digitas.Andy Plesser, Executive Producer Less