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nVidia hdmi audio passthrough

K

Kosmarnik

n00b
Joined
Dec 1, 2010
Messages
16
I'd like to use a spdif over hdmi from my PC.
The graphics card (nVidia GTX 260) supports audio passthrough, but I sadly don't have an spdif header on the mobo (GB P-35-DS3R v1.0), but I do have a rear coax sdpif-out.

Am I correct in thinking I could just use solder a RCA connector to the cable and connect the coax to a 2 pin connector on the graphics card?

I still have to see if my DVI->HDMI adapter will pass the audio through it, but it should as the card has an audio PT feature and only DVI connectors. If not I'll try another DV->HDMI adapter.
 
I would assume so.

Either that, or just solder the wires directly underneath of the mainboard on the points for the coaxial connector itself.

Then you don't have cables running in and out of your PC.
 
RCA Spdif is the same as mobo 2 pin SPDIF out (3 pin just means one is a 5V for running the diode for optical SPDIF.

Optical SPDIF is as I said before just the added current to run the optical driver.

So if you know the correct way you ought to easilly be able to solder.
 
Well, it was easy to solder, but no such luck with getting audio to the TV.
At this point I'm unsure if it's the DVI->HDMI dongles of the software/drivers.
I also have no idea how to check.
Is there a way to be sure that the DVI->HDMI will pass audio (they should, as they came with the card, and the card only has DVI, though one can never be sure).
 
DVI cannot do audio. It doesn't have the pins for it. It needs to be HDMI all the way unless your dongle is a big box that converts the spdif to the hdmi audio format and combines them.

What is your exact video card? nVidia GTX 260 is just the chip that powers it. Manufactures can configure the card with all sorts of different output combinations.
 
AlienKing said:
DVI cannot do audio. It doesn't have the pins for it. It needs to be HDMI all the way unless your dongle is a big box that converts the spdif to the hdmi audio format and combines them.

What is your exact video card? nVidia GTX 260 is just the chip that powers it. Manufactures can configure the card with all sorts of different output combinations.
Click to expand...

Sure it can, but it has to be a custom wired one. I got the Zotac GTX260 amp2 sp216, and it came with the 2pin audio passthrough cable. I'm just not sure if I managed to lose the original DVI->HDMI adapter that came with the card (I did not pay much attention to it at the time).
That's why I'd like to check the dongles...
hmm, I'll go look up pinouts for HDMI.
 
Kosmarnik said:
Sure it can, but it has to be a custom wired one. I got the Zotac GTX260 amp2 sp216, and it came with the 2pin audio passthrough cable. I'm just not sure if I managed to lose the original DVI->HDMI adapter that came with the card (I did not pay much attention to it at the time).
That's why I'd like to check the dongles...
hmm, I'll go look up pinouts for HDMI.
Click to expand...

OK, I understand now. I thought you were just using a generic DVI->HDMI adapter which would only map the DVI-D video pins to the corresponding HDMI video pins. Some manufactures had custom made DVI->HDMI adapters that used some of the other pins (from DVI-A or unused) to pass through the audio. So, you would need the one that came with the card, or one just like it. You could verify the extra pins with a multimeter if you aren't sure.

A couple things to check, with the assumption the cables are working. Make sure the SPDIF is enabled in the BIOS if its an option. Make sure the SPDIF output is enabled in windows. If in windows 7, make the digital output the default device under playback devices.

If you have a receiver or TV around with SPDIF in, hook-up directly to verify the sound is actually coming out of the motherboard's header and possibly test your new cable.
 
AlienKing said:
OK, I understand now. I thought you were just using a generic DVI->HDMI adapter which would only map the DVI-D video pins to the corresponding HDMI video pins. Some manufactures had custom made DVI->HDMI adapters that used some of the other pins (from DVI-A or unused) to pass through the audio. So, you would need the one that came with the card, or one just like it. You could verify the extra pins with a multimeter if you aren't sure.
Click to expand...

Yup, I'd like to verify with a multimeter, but can't for the life of me find out the pinout for this particular adapter :(
I may have misplaced the original adapter as I have 5-6 such adapters, tried them all but not a peep. It could still be a software problem, but I'd like to at least eliminate this.

A couple things to check, with the assumption the cables are working. Make sure the SPDIF is enabled in the BIOS if its an option. Make sure the SPDIF output is enabled in windows. If in windows 7, make the digital output the default device under playback devices.

If you have a receiver or TV around with SPDIF in, hook-up directly to verify the sound is actually coming out of the motherboard's header and possibly test your new cable.
Click to expand...

I think I got the driver settings about right, made the digital out as the default, and tried the tests for different formats (44.1KHz, 48KHz, etc..). They seem to play (there's a volume meter that lights up under control panel/sound), but no sound from the TV.

I would hook it up directly but my TV doesn't have a SPDIF input :(
I can only say that the PS3 audio works nicely over HDMI on the TV.
 
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