Open the menu item Edit/Preferences at the top of the screen. Open the audio & video tab.
Tick “Play Streaming Music when available…”, “Play Streaming Media when available…” and “Automatically play media…”.
From now on, if you walk into a region where there is music or movie to be played, it will be played automatically for you. If this does not work at times, you can always manually start a movie, using the media bar at the bottom right of your screen. You can also use the same media bar to re-play a movie.