Video frame extraction is to extract several frames at a certain interval in a video, to simulate the process of taking a picture at a certain interval and combining them to form a video (i.e. low-speed camera). Compared with simple fast forward, it will have a different feeling. Video frame pulling effect is often confused with what we often call delay photography and low-speed photography.
抽帧存储的定义是对历史图像进行抽帧存储是可较长时间保留关键帧(I 帧)的存储方式。先全量存储所有录像;当保存时间超过全量存储留存期后,系统将逐步删除非关键帧,减少存储容量,有效延长视频信息的保存时间。抽帧之后画面清晰度不变。