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AMD 7950 5.1 via HDMI?!

post #1 of 27
Thread Starter 
How can I get 5.1 surround sound with my 7950? The only option I get in Playback Devices is "Stereo".



EDIT: I'm running HDMI to my TV and then optical to the speakers/ soundbar (VIZIO S4251w-B4 5.1) and I'm on CAT 13.6.
Edited by 8bitG33k - 6/1/13 at 9:43pm
post #2 of 27
Thread Starter 
Update:

I found that if I use VLC Player and check "Use S/PDIF when available" it does play true 5.1 surround (Dolby Digital only, not DTS). What is interesting is that now DTS isn't decoded anymore (just silence) whereas when I was using my analog stereo speakers hooked up to the TV it would still playback DTS (albeit stereo of course). Not sure what this means or if it's even related.



But this is not a fix, merely a work around for movies as it works only for VLC Player. Not for any other player like MPC, WMP, streaming via browser - or, more importantly games.
Edited by 8bitG33k - 6/2/13 at 8:49am
post #3 of 27
i had similar problem awhile back. i had to uninstall amd hdmi audio thru ccm. if that doesnt work, try uninstalling amd drivers and then reinstall making sure hdmi audio is left unticked. good luck



sorry. didnt catch you wanted sound thru graphics. why don't u use mb sound and instructions above? works great
Edited by swamitech - 6/2/13 at 4:38am
    
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post #4 of 27
Thread Starter 
That might work for when watching movies from my PC, but then I won't have audio when watching TV (unless I use the TV speakers for my OTA watching). The other option is to purchase a receiver. Both options are a last resort type of thing though since at this point I am still hoping for a software work around.

I'm thinking that my GPU (or Windows rather) recognizes the TV as having only 2 speakers and that's why it wont even give me the option to output 5.1. If VLC player can be configured to work around this issue, there has to be some kind of work around for Windows.
Edited by 8bitG33k - 6/2/13 at 8:46am
post #5 of 27
you're going to have problems without a AV receiver as your TV identifies its capabilities to the GPU as only having stereo so that's all it will let you output.

You could try manually loading a custom EDID for you TV to enable your surround but are you sure your TV is passing the 5.1 through to your sound bar when you do your workaround, have you checked each channel independently with a 5.1 test track? For example, my TV has a TOSLINK / SP/DIF output but doesn't output 5.1 from the HD channels.

also, your soundbar setup has 2x digital inputs, can you not just use one for your TV (optical probably) and the digital RCA to your computer? TOSLINK and digital coaxial are interchangeable with an active adapter eg (http://uk.startech.com/AV/Converters/Audio/Digital-SPDIF-Toslink-to-Stereo-RCA-Analog-Audio-Converter~SPDIF2AA) if your motherboard already has a digital out or you could get a fairly inexpensive sound card (http://www.scan.co.uk/products/asus-xonar-dg-51-pci-sound-card-and-headphone-ampifier-oem) with a digital out.

another (more expensive) alternative would be to use a HDMI audio extractor which you could route to your sound bar e.g. http://www.lindy.co.uk/hdmi-audio-extractor/38090.html
 
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post #6 of 27
Thread Starter 
Quote:
Originally Posted by pharcycle View Post

you're going to have problems without a AV receiver as your TV identifies its capabilities to the GPU as only having stereo so that's all it will let you output.

You could try manually loading a custom EDID for you TV to enable your surround but are you sure your TV is passing the 5.1 through to your sound bar when you do your workaround, have you checked each channel independently with a 5.1 test track? For example, my TV has a TOSLINK / SP/DIF output but doesn't output 5.1 from the HD channels.

also, your soundbar setup has 2x digital inputs, can you not just use one for your TV (optical probably) and the digital RCA to your computer? TOSLINK and digital coaxial are interchangeable with an active adapter eg (http://uk.startech.com/AV/Converters/Audio/Digital-SPDIF-Toslink-to-Stereo-RCA-Analog-Audio-Converter~SPDIF2AA) if your motherboard already has a digital out or you could get a fairly inexpensive sound card (http://www.scan.co.uk/products/asus-xonar-dg-51-pci-sound-card-and-headphone-ampifier-oem) with a digital out.

another (more expensive) alternative would be to use a HDMI audio extractor which you could route to your sound bar e.g. http://www.lindy.co.uk/hdmi-audio-extractor/38090.html

Thanks for the input.

I'm sure about the TV passing through 5.1. It even says in the TV manual S/PDIF 5.1 Out. Not only does the soundbar acknowledge this by turning on the Dobly Digital light whenever using the VLC player workaround, but I have also tested each channel independently using various Dobly Digital soundtracks/ videos (most notably the DD Channel Check).

The soundbar has only one optical input, the only other digital input being coax. The other two are stereo analog.

So no Windows EDID hack you know of? There has to be a way since VLC player is able to do it.
post #7 of 27
Quote:
Originally Posted by 8bitG33k View Post

The soundbar has only one optical input, the only other digital input being coax. The other two are stereo analog.

yep, you can use an adapter between the two - they both use the Sony/Phlips Digital InterFace standard so they're essentially the same. The adapters are quite cheap so if you have a coaxial or TOSLINK optical output on your computer, that will probably be the simplest.
Quote:
So no Windows EDID hack you know of? There has to be a way since VLC player is able to do it.

hmm, I've only used custom EDID files under linux and with nvidia cards. When you enable S/PDIF in VLC it must output a different audio stream type as HDMI can support 8-channel lossless whereas S/PDIF only supports 2 channel lossless which means you need to use DTS or Dolby for multi channel surround.

I had a quick look around some of my sound options, do you have any of the options like this? Or do you have limited options?

 
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post #8 of 27
Thread Starter 
Quote:
Originally Posted by pharcycle View Post

yep, you can use an adapter between the two - they both use the Sony/Phlips Digital InterFace standard so they're essentially the same. The adapters are quite cheap so if you have a coaxial or TOSLINK optical output on your computer, that will probably be the simplest.

I did not know that! I'm going to have to look for one of those. Lacking a EDID hack and without having to purchase addtl hardware, this seems to be the simplest solution.
Quote:
hmm, I've only used custom EDID files under linux and with nvidia cards. When you enable S/PDIF in VLC it must output a different audio stream type as HDMI can support 8-channel lossless whereas S/PDIF only supports 2 channel lossless which means you need to use DTS or Dolby for multi channel surround.

Trying to wrap my head around what this means. I think I understand. If it's flac or something like that it will be only Stereo, but DD and DTS can be surround.
Quote:
I had a quick look around some of my sound options, do you have any of the options like this? Or do you have limited options?


Yes, I have all those options.



On a side note - what is interesting is that I can now no longer play DTS even though the soundbar is capable of DTS. Previously when I was running analog speakers from the TV I was able to playback DTS in Stereo, now with the soundbar DTS movies are just silent. Don't know how to interpret this or if it even has anything to do with anything.
Edited by 8bitG33k - 6/2/13 at 4:56pm
post #9 of 27
Thread Starter 
So I went to a local store and got said adapter and some cables - and the problem persists. Still no surround sound. Same thing as before - I use VLC Player and I have dedicated 5.1 - I stream the same file from the web or play it in MPC and all I get is Virtual Surround.



In this one, when I right click and "Test", I see the volume bar moving but I hear no sound



In this one I only hear sound when testing with 2 channel, 16bit, 48000Hz selected, not from any of the others.

headscratch.gif

EDIT: Oh, the only difference now is that it will play DTS again (like it did with my analog setup I had before) - just that it's in stereo.

EDIT 2: I also hooked up the Optical directly to the soundbar just to check, and it was exactly the same as with the adapter.

A quiet voice in the back of my head is growing louder saying that I will be having the same issue even with a receiver.
Edited by 8bitG33k - 6/2/13 at 11:23pm
post #10 of 27
I have the same problem as you with a jvc tv and nvidia 9400 board. I have have a dual tv tuner card attached to a dta box and OTA. I couldnt get dolby/dts even directly through the optical out on the back of the pc even though the boards supports it. I moved my creative Xgamer audigy to the pc and use the optical out for dolby/dts.
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