Tik Tok's sleep-assisted decompression video was downloaded from the commercial material library of related websites. Material library refers to the spare materials for doing something, including complete and fragmented materials, and also refers to the collected materials. Video has the characteristics of large amount of information and strong appeal, which is suitable for showing the details of things and presenting some unfamiliar things. Video compression card can collect video materials, convert analog signals into digital signals, and can be directly intercepted from VCD or recorded with screen capture software.