Like, per video on the server stitch in ads to the video file before serving it up? You'd still have to have specific behaviours encoded to specific segments of

Like, per video on the server stitch in ads to the video file before serving it up? You'd still have to have specific behaviours encoded to specific segments of that video file (i.e. clicking on the video during ad should link somewhere different than clicking on the video during the video), and that would probably be detectable.