Topic Title: Can't get 5.1 audio with Radeon HD 5450
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Created On: 05/15/2013 09:06 AM
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 05/15/2013 09:06 AM
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martincmartin
Peon

Posts: 2
Joined: 05/15/2013

Hi,

I have a Radeon HD 5450, and can only get stereo output over HDMI.  I've tried the drivers that come with Windows (AMD High Definition Audio Device 9/21/2012, 7.12.0.7712), the ones with the latest Catalyst 13.4 (3/1/2013, 7.12.0.7714) and ones from Realtek (6/4/2012, 6.0.1.6650).  I've disabled my motherboard's audio.

Windows 7 Ultimate 32 bit.

My receiver only has optical in, so I'm sending the HDMI to box that takes HDMI in and has optical SPDIF as well as HDMI out.  The box has a switch to set Audio EDID, and I've put the switch on 5.1.  When I plug my DVD player into it, I get surround sound no problem.

But in Windows, when I go to the sound control planel -> "playback devices" -> "HDMI Output" -> "configure", the only option for audio channels is Stereo.  In CCC, in the audio tab, it says "your device does not support audio.  Select another audio device from the list above."

What else should I try?

MonInfo says my Windows machine is receiveing the following EDID:

CE audio data (formats supported)

  AC-3    6-channel,  640k max. bit rate at 32/44/48 kHz

  DTS     7-channel, 1536k max. bit rate at 44/48 kHz

 

CE speaker allocation data

  Channel configuration.... 7.1

  Front left/right......... Yes

  Front LFE................ Yes

  Front center............. Yes

  Rear left/right.......... Yes

  Rear center.............. No

  Front left/right center.. No

  Rear left/right center... Yes

  Rear LFE................. No

 

 05/15/2013 10:00 AM
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Irre84
Peon

Posts: 7
Joined: 05/14/2013

Browsed around, and found someone whit same problem. The solution was.

"Success! I downloaded the Realtek ATI HDMI driver and installed, and this time it worked. I now have 7.1 channel audio of all varieties, including bitstreamed TrueHD and DTS MA, and multichannel Flac converted to PCM."

 

Browsed some more, and did find out that Realtek ATI HDMI drivers is replaced whit just the standar Realtek HDMI drivers.

 

I did read that people are using old drivers like this one. http://drivers.softpedia.com/get/SOUND-CARD/REALTEK/Realtek-ATI-HDMI-Audio-Device-Driver-270.shtml

 

People says it working better.

 Hope this helps!



Edited: 05/15/2013 at 10:11 AM by Irre84
 05/16/2013 05:45 AM
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martincmartin
Peon

Posts: 2
Joined: 05/15/2013

Thanks for the tip, that's actually the Realtek driver I had already tried.

So, I figured out what's going on.

S/PDIF, aka optical digital audio aka toslink, only supports compressed 5.1 in either Dolby Digital or DTS, as used on DVDs.  It doesn't support uncompressed 5.1 (LPCM), or Dolby Digital TrueHD or DTS-HD Master Audio.

Also, compressing 5.1 audio into either Dolby Digital or DTS is compute intensive, so you don't want a driver doing it, or even your audio source (e.g. program that plays video files, or video game).  So you're stuck with sources that are already encoded that way.

So I'm guessing that, because the driver can only support a very limited kind of 5.1, it doesn't list it at all.  But luckily, in VLC, I can select "A/52 over S/PDIF" and I get surround sound, even though Windows audio control panel still has Stereo selected.

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