Well, this video file is a common problem of mobile video. The main reason is that when the mobile phone records the video, in order to save the picture in time without loss, there is no real-time compression, so the shot file is very large. But in fact, the effect of mobile phone shooting is compressed to a certain extent, which has no effect on the image quality, but the volume is often 2-3 times smaller. This factor is the bit rate. It is suggested that the landlord use video processing software to convert the video bit rate to 2000-3000, and the resolution does not need to be changed.