AxWindowsMediaPlayer循环播放视频:

player.settings.setMode("loop", true);
player.URL = "XXX\.mp4";
player.Ctlcontrols.play();

信息来源:

https://social.msdn.microsoft.com/forums/windows/en-us/ac133255-2f18-4cd6-a6a1-e83549496794/axwindowsmediaplayer1-media-repeat

实测有效。