One or more frames sampled from a media item of an event that is concurrently being streamed to one or more users of a content delivery platform are received. The one or more frames are analyzed to identify one or more candidate event clocks within the one or more frames. Whether a candidate event clock of the one or more candidate event clocks satisfies one or more conditions for each of the one or more frames is determined. Responsive to determining that the candidate event clock of the one or more candidate event clocks satisfies the one or more conditions, the candidate event clock is identified as an actual event clock used to time the event and mapping data that maps the actual event clock to a timestamp associated with a respective frame of the one or more frames of the media item is generated.