Digital video may not have grown as quickly as we might have predicted ten years ago says Nigel Gilbert, chief market strategist at AppNexus, but this is starting to change. And as digital video’s growth accelerates, the next two years will also define where the market goes in terms of measurement, formats, and attribution. In this interview, Gilbert also discusses why telcos are the “sleeping giants” of digital advertising, but why they have to take a “one step at a time” approach to rolling out ad products. Filmed at NVF Connect in London.