Just set the output video before output: reduce the resolution of the output video, for example, change 1920 times 1080 to 1280 times 720, or reduce the data rate of the output video from 15000 to 6000 per second, or change the format and encoding method of the output video. Of course, when setting, we should also pay attention to that reducing the video resolution or video data rate will reduce the clarity of the output video, and it should not be too small, otherwise the output video will be too blurred.