What is video frame extraction?

Video frame extraction is to extract several frames from a video at regular intervals, simulating the process of taking a photo at regular intervals and splicing it into a video (that is, low-speed shooting). It will feel different from simply fast-forwarding.

The effect of video frame extraction is often confused with time-lapse photography and low-speed photography. The difference between them is that time-lapse photography is a method of taking pictures, low-speed photography is a method of taking videos, and frame extraction is a means of later video.

Time-lapse photography is essentially an exposure at a certain time interval, and the images formed by each exposure are superimposed (synthesized) on the same picture. If it is a film machine, it is a negative that has been exposed many times at the same time interval.

Extended data:

Each video will form a frame number before frame extraction. The frame number of video is the number of pictures transmitted by 1 sec, which can also be understood as how many times the graphics processor can refresh every second, usually expressed by fps (frames per second).

Every frame is a still image, and the illusion of motion is formed by displaying frames quickly and continuously. High frame rate can get smoother and more realistic animation. The more frames per second (fps), the smoother the motion display. But the bigger the file will get.

So when you see "30 frames" in the parameters, it is actually "taking 30 still pictures a second and then connecting them by playing".

Design and Implementation of Panoramic Mosaic System of People's Network -360-degree Video Sequence