DVD.app no Dolby 5.1 thru optical cable on Cinema Amplifier

Hallo,
last night I tried the first time watching a DVD with Dolby 5.1 on my IMAC 2008 Unit. Using the DVD.app which comes with Leopard, was not giving me Dolby 5.1. After checking all possibilities of settings still only PCM Stereo. I also checked some Forum's on the Internet but not got the right answer. Same result useing VLC.app. After installing Perian.app I got Dolby 5.1 with VLC.app.
Still I would prefer useing the DVD.app.
Is there maybe something missing, or does the DVD.app not support Dolby. Some on other Forum say it does and some say it does not support dolby.
Operation system is Leopard 10.5.7 with all updates on my IMAC.
I am thankfull for info.

Problem solved.
On my AV Receiver RX-V2700 I selected Input as auto. With this seting the Mac does not recognized the AV receiver as DD 5.1 unit. The VLC player played 5.1 because I set the option "force dolby digital" or similar on VLC options. The Apple DVD Player don't has this option to set. As soon I seted the Av receiver input permenent from auto to optical input dolby worked.

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