Re: 5.1 AC3 passthrough
From: Michael Thwaite (nntp_at_Thwaite.NET)
Date: 04/22/04
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Date: Thu, 22 Apr 2004 09:57:49 -0400
Comments below:
"David Shorthouse" <davidshorthouse@shawyourclothes.ca> wrote in message
news:Onkqy68JEHA.644@tk2msftngp13.phx.gbl...
> Michael,
>
> Thanks for your reply and offer of assistance. My comments are below:
>
> > I've had 'issues' with the Cyberlink MPEG codecs with both WMP and Adobe
> > Premiere; I'd recommend removing them and using nvDVD (plus the DVD menu
> > patch!) which seems to be the 'It just works' solution.
>
> Tried nvDVD 2.55 once all other DVD audio & video codecs were uninstalled
> &/or unregistered. Get the same problem. I can initially select s/pdif in
> any of these applications, but as soon as I attempt to play a DVD either
> within or outside MCE2004 using WMP9, sound immediately reverts to 2
channel
> and I can never again choose spdif- the option becomes greyed out. What is
> the DVD menu patch? The 2.55 install patch available from NVIDIA?
>
It's a reg patch on their site or here that restores the menu overlay in DVD
menus:
[HKEY_LOCAL_MACHINE\SOFTWARE\NVIDIA Corporation\Filters\Video]
"DisableSubpictureOutputPin"=dword:00000001
Did you select 5.1 in Control Panel/Sounds.../Speaker setup/Advanced ?
> > Direct Show is a little like the old 'DLL hell' I've found. To remove
the
> > Cyberlink codecs, open a command prompt and navigate to the power link
> > directory, there should be a whole bunch of .ax files in there, for
_each
> > and every_ file enter:
> > regsvr32 /u c?????.ax
> > where c????.ax is the name of the directshow filter/codec.
>
> FYI, the audio codec is claud.ax and the video codec is clvsd.ax
>
There's more I believe; a stream splitter in there. I removed them all.
> > Either way, consider stripping down any other 'rouge' codes by hunting
> down
> > the .ax files and unregistering them.
>
> Do you mean rogue?
No, I prefer all of my codec's to be red ;-)
>
> > Once you're down to a clean system that _won't play TV_ you can install
> the
> > nvDVD software and check again in the Media Center UI.
> >
> > When this is complete you should be able to follow the many threads and
> set
> > everything in sight to 5.1 with S/PDIF output and it should work*
>
> Sorry, tried all this and still no go.
>
> > There are tools like GSPOT that'll assist in this process but the above
is
> > simple and effective I think.
> >
> > If it helps; all my DVD watching is now through MCE, I have a DVI
equipped
> > flat panel and I get a kick out of the whole digital-to-digital, never
> > analogue playback thing.
>
> I have essentially given up on this problem and I assume there is a
bizarre
> WMP/audio driver issue going on here. The SoundMax AD1888 chip must be a
> cheap onboard solution or its drivers are in need of re-writing. What irks
> me is that AC3 pass-through works in any of the DVD decoding software
> packages I install provided I use those applications to play the DVD. As
> soon as I attempt to use WMP or the MCE2004 interface, that's when I
cannot
> get full AC3 pass-through, just PCM. Somehow, the audio codecs within WMP
> downmix the channels before spitting it out through the s/pdif.
>
Damm, I have the same setup as you; same card; it's cheap but it did work.
Have you tried a roll-back with system restore to a more simple time? Or,
make sure you've the lates drive from SoundMax?
> So, I have created a not-so-elegant solution to my problem:
>
> 1. create a shortcut to PowerDVD (or any DVD application) in MCE2004's
menu
> in "Other Programs" in the Start Menu
> 2. create a second shortcut in MCE2004's menu to a batch file to close
> PowerDVD using the WM_CLOSE function via an app called "Close" available
> here: http://thethin.net/download.cfm
>
> The reason for #2 is that this is a dedicated htpc w/o mouse or keyboard
so
> there is no way to close PowerDVD with the remote.
>
Yuk; I feel your pain!
> > * WMA PRO requires a ridiculously expensive (today) WMA PRO capable
> > receiver.
>
> What is a capable WMA PRO receiver? Could this be the source of my
problem?
> I have a s/pdif coax from my PC's audio to my Dolby Digital receiver.
>
>
Pioneer have one but it's in the USD four figure range at the moment.
If you have $99 I'd go for this solution; I used the same config as you but
my receiver handles PCM, Dolby Dig. and DTS only. It took me a moment to
realize but when I played back the WMV hi-def demos I could here the sound
but not the voice... no center channel.
I've just had some great results on a couple of PC's using the External USB
SoundBlaster Audiology NX. I was fully prepared for failure but in the end I
skipped the SPDIF. I connected the external soundcard to the 5.1 seperate
in(s) on the receiver using really short cables and ran a longer USB to the
pc keeping the precious audio signal digital as far as I could. The
performance on the external card is stupendous; really low noise floor, no
interference and I get the rather dubious 2 to 5.1 channel upmix for music
and 2-channel source which, for general music listening creates a fuller
sound (I know, up to that point it was working, now I've just blown my hifi
enthusiast credentials!) and uses all channels of the amp.
eMPTy.
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