Why does Xiaomi camera look back intermittently?

Xiaomi camera was originally set like this. In order to save storage space, the ant camera will record the changed pictures and save them in the SD card. If the picture does not change, it will not be recorded, so it will cause a blank period on the timeline. That should be what you said. The broken part is because during this time, the little ant did not monitor the change of the picture, so it was not recorded and broke.