> Achim,
> 
> I read you explanation but I can't get it working like expected.
> 
> I run my tests on Ubuntu 9.10 and 10.04 alpha2.
> I configure VLC with "use S/PDIF if possible" and totem with "direct AC3 
> output".
> I chose "analog duplex" profile for my usb terratec MKII sound card on 
> gnome-volume-control.
> 
> When I play a dolby-digital sample vob file, I get stereo sound trough
> my optical connexion. This is strange because this happen even when
> "digital output" profile isn't used. Is it my sound card that create a
> digital stereo stream ?

If you only get stereo sound, this can have several reasons.
1. the vob file only has Dolby Digital 2.0.
2. the sound gets resampled by pulseaudio.

Totem with gstreamer is not able to pass-through dolby-digital.
VLC with "use S/PDIF if possible" and Alsa should work.

Make sure that you don't use PulseAudio as output in VLC.

I also had to restart VLC to get it working.

> Is there a way to get more information about what kind of stream is
> sended by the system through the digital output ?

You can use this file as test.
http://www.lynnepublishing.com/surround/www_lynnemusic_com_surround_test.ac3

I hope this information is helpful

Regards
Achim

-- 
S/Pdif / digital output not available in pulseaudio
https://bugs.launchpad.net/bugs/205717
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