When asked the biggest challenges in online video advertising this year, top executives at media agencies like Starcom and MediaVest say they're most eager to target audiences better and to access more sophisticated data around viewership.

At last week's 4A's conference in San Francisco, which drew top brass from ad agencies and brands, I caught up with MediaVest's President Donna Speciale, Starcom USA CEO Lisa Donohue, and 4A's Managing Director Harold Geller. Here's what they had to say about this year's Web video hurdles in this week's New Media Minute.

Daisy Whitney

Editor's Note:  Daisy's New Media Minute is produced and sponsored separately from Beet.TV.  We are pleased to publish her segment regularly here.  AP