Video collection
The audio and video recording equipment set consisted of a six-camera surrounding unit, a three-camera independent pickup, and a recording and broadcasting workstation to ensure the critical operations were not obscured. During the exam, the audio and video recording equipment documented the complete process, which was integrated into a format with six channels of video and three channels of audio as H.264 format files (frame height 3240, frame width 3840, frame rate 25 frames per second, three audio tracks). The hash value, examinee, examination group, and examination time were calculated, and files were uploaded to the base server. Video answer files were produced. Backup files were stored on the workstation.