描述应用程序如何才能从定制的目录取得需要的视频流(VOD)，以及录制视频流到定制的目录中，而不是默认的在webapps/streams目录-Describes how an application can be obtained　the custom directory needs video streaming (VOD), and record the video stream to a custom directory, instead of the default in the webapps/streams directory