Why is there slow motion on the Spring Festival Gala?

As for the slow motion in the Spring Festival Gala, I saw a lot of it on the Internet before and found it quite interesting. Because I work in television and have done a lot of live broadcasts. Now I will focus on the slow motion in the Spring Festival Gala. The analysis is as follows: Two possibilities: 1 Because such a large-scale live broadcast program is prepared before the live broadcast, that is to say, the makeup rehearsal is exactly the same as the live broadcast, just in case of emergency. If during the live broadcast If an accident occurs, backup tapes can be used to ensure the normal broadcast of the program. So many people said that the Spring Festival Gala used a combination of direct recording, inserting pre-recorded preparation tapes during acrobatics and other difficult movements. But I think it's impossible. Because for such an important gala, the director of the Spring Festival Gala blatantly adopted this method, which really made the national audience look like idiots, so the possibility is relatively small, but this method does exist in other live broadcasts. 2 Live broadcasts, whether on radio or TV, are all delayed. For example, the Spring Festival Gala will be broadcast live at 8:00 Beijing time. In fact, it officially starts at 7:59 Beijing time at the scene. [If the delay is 1 minute], at 8:00 you will see the live recording of the live broadcast room at 7:59. From this perspective, there is currently no real live broadcast. To put it another way, it is equivalent to me recording it on site one minute ago, and then sending the recorded program to the broadcast room for broadcast within one minute. Perhaps this explanation may be more clear. So this completely provides the possibility to achieve slow motion during live broadcast. Because slow motion will stretch the time, for example, it stretches 10 seconds to 20 seconds, then it was a 60-second delay. If the program stretches the 10-second shot to 20 seconds at 8:30:30 , then, after 8:30:40 seconds, the program you see is the scene at 8:29:30. Therefore, it is entirely possible to use this delay to achieve slow motion. It just extends the delay time. For example, the normal delay is 60 seconds. In the program, 5 seconds should be stretched into 10 seconds. This can be understood as broadcasting. There was a 5-second pause, but the scene continued, so the delay became longer. Because it was written in a hurry, if you don’t understand, please contact me.

Happy New Year to everyone!