A method and system for comparing video and audio information at first and second spaced-apart locations on a content distribution network. Network probes are located on the network and extract a respective first and second plurality of video frames and audio segments. Two fingerprints sequences are determined from each one of the frames and segments, then the sequences are matched and time-aligned. A beginning of a matched segment is determined and the individual fingerprints within each of the fingerprint sequences are compared from the beginning of the matched segment. Fingerprints that are determined to be different during the comparison process indicate a change in video or audio content between the two probes.