[mythtv-users] Nvidia 8400GS SPDIF/HDMI pass through.. how?

Bill Williamson bill at bbqninja.com
Tue Oct 6 10:46:36 UTC 2009


On Tue, Oct 6, 2009 at 8:51 PM, Roy Lofthouse <lofty69 at gmail.com> wrote:
> 2009/10/6 Nick Rout <nick.rout at gmail.com>:
>> On Tue, Oct 6, 2009 at 9:25 AM, Dan Ritter <dsr-myth at tao.merseine.nu> wrote:
>>> On Mon, Oct 05, 2009 at 08:47:42PM +0100, Roy Lofthouse wrote:
>>>> I'm running a pure dvi cable, but will test with a dvi-hdmi cable
>>>> tomorrow.  I'm starting to think it's a hardware issue.  My SPDIF
>>>> header only has three pins and I went off the connector that was
>>>> already there (Black/Red and White wires).
>>>
>>> DVI doesn't carry sound. Only a cable that is HDMI from one end
>>> to the other will carry sound.
>>
>> Untrue. The audio and video are muxed into one stream. DVI will carry
>> that stream whether or not it has audio, its just that displays with a
>> DVI port don't have any logic to extract the audio. However a DVI to
>> HDMI cable will fix that.
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>
> Thanks to all who replied.. turns out it was just the connector that
> needed the pins changing.. I was loathe to do this again as the first
> time I did the system would not power up... so I left the GND and
> swapped the SPDIF over to the only other connector and voila!
>
> Only things is I had to disable AC3 and DTS passthrough to get some of
> my vids sounds to work.


You were very very lucky.  That other pin was +5v to power an optical
diode for optical out.  Be sure to read your motherboard manual before
trying something like that rather than randomly picking pins or you
could fry your video card.


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