File --> Open video file --> 你要切割的影片
Video --> 选Direct Strean Copy
Audio --> 选AVI audio和Direct Strean Copy
到你要切割的开头後 Edit --> 选Set Selection Start
到你要切割的结尾後 Edit --> 选Set Selection End
File --> Save as AVI --> 打入新档名,存档
音源是VBR MP3的话,用NanDub比较好,除非你用的VirtualDub是特别版