http://mercury.bbspink.com/test/read.cgi/avideo/1574483957/468
http://mercury.bbspink.com/test/read.cgi/avideo/1578038023/261
http://mercury.bbspink.com/test/read.cgi/avideo/1487955669/869
http://mercury.bbspink.com/test/read.cgi/avideo/1565361383/577
6． 連続投稿・重複