Sound input fine, but no sound?

I have a Mac Mini 2,0Ghz and have a DVD-player's audio output plugged into the sound input of the Mini (RCA>3,5mm plug). The Mini's sound output is connected to my stereo. I can play iTunes songs without problems. Now I want to listen to an external source.
I look in sound preferences on the Input tab and I see the Input Level bar indicating sound input, I pause the DVD and the bar stops fluctuating, fine so far. I make sure that the output volume is adequate and then I turn on the stereo, but there is no sound. I mak sure that there is sound by checking with iTunes, I can hear the songs.
Do I have to switch over to the Input selection or something to hear the sound from the DVD-player? I come from using Windows and there you'd have to enable the input.
How do I get output from the input?

Audio input has to go to an application. Most applications that use audio input will have a passthrough mode (e.g. QuickTime Pro has a passthrough volume control in its recording window). LineIn is nothing but passthrough.
It's like the keyboard. Nothing happens if you type with no application listening. Whether or not the typing shows on the screen is up to the application (e.g. Terminal will not show anything while you enter a password).

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