The Arm Community supports the following video site URLs for embedding videos in a post:
Notes:
*If the page the Screencast video is on doesn't include public embed information, Arm Community cannot play it inline; instead, the video will be opened in a new window. If you generate an SWF file from a Screencast, you can get a link directly to the swf and embed that in the Insert Video popup. Arm Community previews all YouTube videos.