Hi,
it looks or better sounds like one of the most common problem's with VLC 0.8.x since a long time ...?
Did you try the Waveout audiomodule?
goto -> Settings Dialog -> Audio -> Outputmodule -> choose "Win32 waveOut Extension"
(you need to restart vlc after doing this change - to apply)
you should also check "[X] use S/PDIF if available..." ... if this doesn't help either, try one of the
nightly build's from the upcoming 0.9 Version - where some changes are done on the "Win32 waveout Extension" - especially for S/PDIF output.
and last but not least the usual question's:
-> Whats OS are you useing?
-> Hardware? Soundcard? Type?