CORRECTING AD MARKERS IN MEDIA CONTENT

Content is received from a content origin and includes a first I frame occurring in the content at an actual start time of an ad segment. The content includes an ad marker comprising an indicated start time of an available segment, and the actual start time is within a predetermined period of the indicated start time. The ad marker is updated to set the indicated start time equal to the actual start time. The predetermined period may be within 0.5 seconds of the indicated start time. A second I frame may be detected in the content, and a signature may be generated for content at the time of the first I frame. The first I frame corresponds to the actual start time in response to the first I frame occurring before the second I frame and in response to the signature matching a signature of a known ad.