Question

main four difference between vedio image and photographic image.

Answer 1

ilm could be described as a series of photos (in movies normally set at 24 frames (or photos) per second).

In video, especially digital video, there is the added difference, that most video is compressed in some form or other, to save data storage.

Much like a jpeg photo is compressed, and does not contain individual data for each and every pixel, video is compressed in a way so not all frames contain all data to comprise a full picture.

To put it simply, (there is obviously more to it than this, but this is the basic concept) there are I-frames (or key/reference-frames), that contain the data needed to form a picture, and in between are a number of p-frames (or "predicted" frames), which basically contains only the differences from one frame to the next.

Consider a sequence where a car is driving along a road. Only the car's position in the picture changes from one frame to the next, so pretty much only the data containing the moving car is contained in the p-frames.