A system and method includes an automatic content recognition (ACR) headend to perform ACR recognition on a video stream that is also being streamed to a smart TV, to detect timing of an upcoming ad spot to be delivered within the video stream. An addressable TV (ATV) engine can be in communication with the ACR head end and to: determine, from data of an ad campaign, whether a first ad to be delivered to the ad spot is off target for the ad spot; notify the ad replacer client to replace the first ad with an addressable ad when the first ad is off target for the ad spot; and provide, to the ad replacer client, criteria with which to constrain an ad request to obtain a second ad that is on target for the ad spot.