Use these steps to enable looping when only one movie is in the playlist.
Using QuickTime Streaming Server 3 or Darwin Streaming Server 3, you can enable looping with a single movie by making one of these changes to the default settings:
Note: By default, the Playlists Settings pane in the Streaming Server Admin application sets a recent_movies_list_size value of 1. Additionally, the default play_mode is weighted_random. Movies loop when these defaults are present with more than one movie in the playlist. But when you have only one movie in the playlist, it plays once and does not loop.