视频中这种切断装置是什么原理？

$("flv_e5w").innerHTML=(mobileplayer() ? "" : AC_FL_RunContent("width", "500", "height", "375", "allowNetworking", "internal", "allowScriptAccess", "never", "src", "https://player.youku.com/player.php/sid/XNTYxMzM4OTM2.html/v.swf", "quality", "high", "bgcolor", "#ffffff", "wmode", "transparent", "allowfullscreen", "true")); 看起来应该是有动刀和定刀，但是又不是错切，难道是转动动刀切断吗？请高人指点 不好意思 视频搞错了，这个视频里有切断 http://v.youku.com/v_show/id_XNTYzNDg4NzI0.html