[mythtv-users] I thought I understood HDMI audio, but...

[Don Brett]

Calvin Harrigan wrote:
> On 6/27/2010 5:51 PM, Don Brett wrote:
>> I just bought a Vizio E421VA at Sams, and I'm having trouble
>> understanding the HDMI and audio parts. I thought the video signal was
>> on the HDMI cable and the audio was on a separate audio cable (rca
>> connector style). As I understand it, integrated video and audio on HDMI
>> is just happening now with some of the latest nvidia boards.
>>
>> I was planning to use the two cable solution, but the TV doesn't seem to
>> work that way. I asked Vizio tech support, and they expected to have the
>> signal integrated. Their instruction manual shows the two cable method,
>> but it didn't work (HDMI #2 is mated with the PC audio connector). How
>> should it work?
>>
>> PS - I didn't notice it at first, but all the HD TVs at Sam's were
>> running with the component inputs...kind of ironic.
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>
> After reading your posts in this thread, I think you've come across a 
> problem that's been discussed several times before.  In a nutshell, 
> your video card (drivers) is seeing the tv as being able able to 
> handle hdmi audio so it enables the audio channel of the stream, which 
> then causes the tv to switch from the rca inputs to the hdmi's audio 
> stream.  The problem is that there is no audio coming in, though the 
> audio channel is open.  You can either get the audio into the stream 
> by using the header or integrated audio device on the video card or do 
> what many have done and disable the hdmi audio channel in the data 
> stream.  If I remember correctly, there are several steps.  First was 
> to extract the EDID info from the tv using the nvidia-settings 
> program, then editing it to remove/disable the audio information and 
> then pointing the xorg.conf file to the newly edited file for the tv 
> information.  I'm doing this from the top of my head so please forgive 
> any errors.  Search the list for references to EDID, nvidia-settings, 
> manual hdmi configuration, etc.
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>
I just don't believe it.  What a great explanation...and right on the 
money.  I just  happened to have an old nvidia 8400gs, so I plugged it 
in and used the DVI output; both video and audio works fine.  Wow, an 
empty audio stream, I never would have guessed.  I'll use this board 
until I figure out how to get audio into the nvidia 220 (another weekend 
of reading  :) ).  Thanks everyone for the help, I really appreciate it.

Don