Tips:1. Click the start time of the progress bar, you can freely set the video playback start time, press Enter to confirm; 2. Click the duration, you can set the video playback time, the duration is up to 20s, the shortest 1s, press Enter to confirm; 3 When the network video is played, it will be buffered first. The video may be a little bit stuck when playing the video. 4. The local video only supports the video files of mp4 and mov format.