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Kuu · 04/11/2008 05:02 PM

I have a DD-HD and DTS HD receiver. Problem is when I run Blu-ray movies on my PC, the audio only transfers as 2-chan PCM. Only regular Dlolby Digital transfers as 5.1.

I use Power DVD which is compatible with Uncompressed PCM, and both HD formats, and have the card and player as SPDIF, digital optical out, but still only 2 chans.

Is there a sound card that will broadcast the formats correctly (or a setting I have to tweak cause I have a 6 channel high definition onboard card with optical out)?

ZiNgA BuRgA · 04/11/2008 05:53 PM

Have no idea how your application handles things, but I know Media Player Classic can handle custom channel mapping (ffdshow probably does it as well).
In MPC, in the Audio Options, just set up the channels so that stereo output goes to the speakers of your choice.

Kaiser · 04/11/2008 08:35 PM

ZiNgA BuRgA Wrote:Have no idea how your application handles things, but I know Media Player Classic can handle custom channel mapping (ffdshow probably does it as well).
In MPC, in the Audio Options, just set up the channels so that stereo output goes to the speakers of your choice.

what he wants is to find a sound card which outputs all the sound channels correctly, intead of the same 2 all over the place

i think any sound blaster card is up for the job...

ZiNgA BuRgA · 04/11/2008 09:13 PM

Kaiser Wrote:
ZiNgA BuRgA Wrote:Have no idea how your application handles things, but I know Media Player Classic can handle custom channel mapping (ffdshow probably does it as well).
In MPC, in the Audio Options, just set up the channels so that stereo output goes to the speakers of your choice.

what he wants is to find a sound card which outputs all the sound channels correctly, intead of the same 2 all over the place

i think any sound blaster card is up for the job...

Wait, he said that Dolby Digital is 5.1, which means that the soundcard is doing the job? Maybe some soundcards (or driver) have the ability to automatically spread out stereo, dunno... but otherwise, if the soundcard's working, you just need to get the software to map the channels across.

But if he's asking for a soundcard, then any Creative Sound Blaster, Audigy or Xi-Fi will do the trick ;)

Kuu · 04/11/2008 10:11 PM

I just don't know why my receiver thinks my computer is broadcasting PCM when it'd Dolby Digital-HD, 2 completely different outputs. I'm going to do some more experimenting.

I think my computer is trying to decode the sound (and failing) before sending it to my receiver.

ZiNgA BuRgA · 04/11/2008 10:31 PM

You can send stuff that isn't PCM?
PCM is just uncompressed audio. Maybe Dolby Digital (AC3?) adds some extra flag to signify it? I doubt there's any difference really.

Kuu · 04/11/2008 10:49 PM

The receiver's decoder knows what it is. When the PC broadcasts, it will set itself to PCM, DD, DD-HD, or DTS-HD depending on the signal and decode the single accordingly.

After some fiddling, I got it reading DD-HD as DD 5.1. Closer..

Hmm.. Now it's even reading Uncompressed PCM as DD 5.1 D:

Blah! It was mixing it into AC3 before sending it :(

Kuu · 04/11/2008 11:16 PM

Figured it out.

engadget Wrote:As great as Toslink is, it's only capable of carrying 1.5Mbps of data, which limits you to either lossy Dolby Digital, DTS, or two channel PCM (uncompressed)

ZiNgA BuRgA · 04/11/2008 11:53 PM

Oh okay, I see what it means now - sends sound data digitally in compressed format. Yeah, most apps will decode any audio and send it across as PCM to the sound system.
What did you do to solve it? Some driver/software level encoder?

Kuu · 05/11/2008 12:26 AM

Yep software level. I have it encoding all streams into AC3 and broadcasting as Dolby digital, seeing as the Optical Out won't support it, it needs to be either analog 5.1 channel or HDMI to use the HD formats.

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