The 2ndLook Video Library recording format includes a timestamp in the file along with each recorded frame. This reference allows for time-based frame correlation with other cameras which may not have been operating at the same frame rates during the recording. The 2ndLook review perspective allows time-based playback and frame-by-frame analysis of recordings which include timestamps. The other recording formats supported by 2ndLook do not include timestamps, thus any recordings made with those formats can only be reviewed using standard image and video viewing programs (e.g. Windows Media Player etc.). For a full list of advantages of recording to the 2ndLook Video Library format please see this article: https://support.ioindustries.com/portal/helpcenter/articles/what-are-the-advantages-of-using-the-2ndlook-video-library