Video information defining video content may be obtained. The video content may include video frames and may have a progress length. The video frames may be encoded into video packets, with the video packets being of particular sizes. One or more size criteria for detecting a given moment within the video content may be obtained. The sizes of the video packets may be compared with the one or more size criteria. One or more sets of the video packets that satisfy the one or more size criteria may be identified. One or more portions of the video content having video frames defined by the set(s) of video packets that satisfy the one or more size criteria may be identified as the given moment within the video content. Storage of the identification of the given moment within the video content in a storage medium may be effectuated.