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Gannet

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#40705 2-Sep-2009 13:00
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I've had an issue with audio dropping off certain programs when watching Freeview HD. I use an HDMI lead from my HTPC to my TV, using spdif bridge from Audigy 2 ZS audio card to my 9800 GT in the HTPC. Usually audio and video work great, but for certain DVB-T TV programs. TV3 is where it pops up (though it may be an issue for other channels), the common thread is the programs where I have no audio are broadcast with Dolby Digital Plus or E-AC-3. After some investigation, looks like spdif can't handle this codec - http://en.wikipedia.org/wiki/Dolby_Digital.

text from site: "E-AC-3, more commonly known as Dolby Digital Plus, is an enhanced coding system based on the AC-3 codec. It offers increased bitrates (up to 6.144 Mbit/s), support for more audio channels (up to 13.1), and improved coding techniques to reduce compression artifacts. It is not backward compatible with existing AC-3 hardware, though E-AC-3 decoders generally are capable of transcoding to AC-3 or DTS for equipment connected via S/PDIF. Only the discontinued HD DVD system directly supported E-AC-3, though Blu-ray disk offers E-AC-3 as a option to graft additional channels onto an otherwise 5.1 AC-3 stream."

I'd be interested to hear from anyone who has come across the issue before and has solved it. Any suggestions also welcome of course. I'd like to avoid installing various codecs if possible as my current setup is working great aside from this issue.


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sbiddle
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  #252557 2-Sep-2009 13:22
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What programs?

It's the first I've heard of TV3 using Dolby Digital Plus.


Gannet

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  #252573 2-Sep-2009 14:08
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From memory, the last program with the issue was SVU. But M7MCE displays an icon for programs that are using DDP. Only DDP programs are giving me the issue.

 
 
 
 


sbiddle
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  #252579 2-Sep-2009 14:30
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So you're only experiencing these issues using Windows 7 MC?

It would be very interesting to see if this is an issue just with Windows 7 and whether other users or people using different TV software are experiencing it. It's certainly the first time I've heard of an issue but I haven't watched SVU lately.



Gannet

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  #252701 2-Sep-2009 18:48
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Yep, running Windows 7 RC Build 7100. The easiest OS install I've performed to date.

I hope I get some input from others, but I think I've posted this on the wrong forum.

rhysb
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  #252721 2-Sep-2009 20:04
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Win7 will display the DD Plus logo for any AC3 content, so I wouldn't go by that to determine if it is DD Plus or not. Codec info shows SVU is using plain old 6ch AC3 @384Kbps for me.

Are you able to play the AC3 track from a DVD correctly?






Gannet

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  #252735 2-Sep-2009 20:49
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Oh okay, well that's interesting. What's the easiest method for testing AC3? Any DVD?

sbiddle
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  #252745 2-Sep-2009 21:14
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Try a DVD and make sure you select Dolby Digital 5.1 if there are multiple audio channels.

 
 
 
 


rhysb
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  #252785 2-Sep-2009 23:32
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Most DVD's should have a 5.1 AC3 track.

If you have a Pixar movie, they usually have a THX calibration menu that you can use to test your surround setup using 5.1 AC3.






Gannet

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  #253094 4-Sep-2009 09:42
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Okay, I tried a DVD last night same issue. So, looks like you're right about it being an AC3. I downloaded AC3 filter in an attempt to fix the issue, but it did not. Any ideas what to do next? Codec advice, anyone have a specific codec in mind that would work?

sbiddle
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  #253112 4-Sep-2009 10:59
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Gannet: Okay, I tried a DVD last night same issue. So, looks like you're right about it being an AC3. I downloaded AC3 filter in an attempt to fix the issue, but it did not. Any ideas what to do next? Codec advice, anyone have a specific codec in mind that would work?


Just installing AC3filter won't fix the issue as Media Center is still using the default Microsoft codec.

Try reading this page which shows how to use AC3filter, presumably it still works in the later Windows 7 releases.

rhysb
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  #253175 4-Sep-2009 14:12
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Before you go mucking around with codecs, I'd suggest you check the spdif connection from your soundcard to the vid card.

You could also try running a seperate spdif cable to your TV, just to make sure it's not getting screwed up going through the HDMI.






Gannet

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  #253433 5-Sep-2009 19:11
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Okay, have now pluged speakers directly to sound card and still have the issue. So, I'm guessing its not related to the HDMI setup. Have installed AC3 Filter to no avail either - tried several different settings, though nothing so far. In saying that I'm not entirely sure what I'm doing, if anyone has some instructions that I could try, I'll give them a go. Otherwise, still banging my head - video plays, just no audio.

rhysb
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  #253440 5-Sep-2009 20:15
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Something else you could try is ditching the Audigy and use the onboard sound. I see that your MB has both optical and coax spdif out.






Gannet

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  #253943 8-Sep-2009 07:54
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Good point, I'll give it a crack.

Though should it prove to be the Audigy card, how would I get the spdif to the video card for HDMi pass through. I don't think there is an spdif pins on the mobo. I'd have to route a cable from the back of the PC? how do others do it?

Gannet

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  #256725 18-Sep-2009 07:49
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Just to follow up on this issue. I finally got the opportunity to test ditching the Audigy and going with the motherboard sound. I have sound! So, the issue is with the Audigy.

Now I need to figure out how to get sound passthrough from a A8N5X to my 9800 GT? open to ideas on that one.

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