pulseaudio.txt

AC3/passthrough sound with pulseaudio
Don't know how, but it works for me :)
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$ cat ~/.pulse/daemon.conf
enable-remixing = no
default-sample-rate = 48000
default-sample-channels = 2
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xbmc -> settings -> system -> audio hardware
Audio output                         (Digital)
Dolby Digital (AC3) capable receiver (x)
DTS capable receiver                 (x)
Audio output device                  (default)
Passthrough output device            (iec958)
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$ gnome-alsa-mixer
Headphone                            ( )
IEC958                               (x)
IEC958 Default PCM                   ( )
Channel model                        ( )
Input source                         ( )
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$ ps ... | grep pulseaudio
23541 /usr/bin/pulseaudio --start --log-target=syslog
23545   \_ /usr/lib/pulseaudio/pulse/gconf-helper
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$ pulseaudio -k; # kill and re-read config

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http://ubuntuforums.org/showpost.php?p=7560563&postcount=3