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AAC passthrough (S/PDIF) solution? (PC to Home Audio)
post Jun 3 2009, 10:28
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Hi guys,

I've been looking for a solution to output AAC on my PC through S/PDIF to my home audio system. My home audio receiver is capable of independently decoding AAC.

On my computer, I'm using ffdshow. It has options to passthrough AC3 and DTS, but not AAC. If I chose to disable AAC on ffdshow codecs, it still won't work.

I also know of the "convert AAC-to-AC3 on the fly" method, but I really would like to figure out a direct native passthrough to preserve quality.
I've also given thought to switching over to AC3Filter and others, but it doesn't seem like they support it either. If anyone could recommend one that works, it would be helpful

Its possible that I'm missing something very simple here. rolleyes.gif Any help would be appreciated. Thanks!
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post Jan 5 2011, 20:33
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Good timing! I got this working last night, so I registered an account on this site to post my hopefully HELPFUL reply!

I had a 720p Blu-ray movie with an AAC encoded multi-chanell audio stream

In XBMC ver. 10 the movie would decode from AAC to Dolby digital surround on my receiver without issue, however I wanted to try playback on Media center classic - Home theater edition just for kicks.

I played around with the settings for about 30 minutes and finally got it to work, i'll post pix later!

I used the latest versions of FFDShow and MCC - Home theater edition, both version are x64 (My HTPC runs Win 7 x64) I also have the latest version of the Haali media splitter.

Because FFDShow is software based and I wanted to have take advantage of hardware based acceleration for H264/VC-1 content, so I don't use FFDshow for video - JUST AUDIO.

As such, the internal filters for DTS/AAC/AC3 are all turned off within MCC HT (media center classic home theater)

Within FFDShow - audio config, I enabled the codecs for AC3/DTS/AAC.

I then went to the MIXER section and set it to 5.1.
Under output I enabled some additional settings which I can't recall @ the moment. I believe I checked EVERY BOX with regards to AC3/AAC/DTS and S/PDIF output though.

Once this was all done, I closed and re-opened MCC - HT and voila ! A Dolby digital icon appeared on my onkyo receiver and I had surround sound. This is the best I can get it working AFAIK, because my Onkyo receiver doesn't support AAC.

The above was mostly an exercise is tinkering as I mostly use XBMC 10 for movie playback now, it doesn't require much of any tinkering for A/V playback to work successfully biggrin.gif
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Posts in this topic
- DOHCtah   AAC passthrough (S/PDIF) solution? (PC to Home Audio)   Jun 3 2009, 10:28
- - cowunder   QUOTE (DOHCtah @ Jun 3 2009, 10:28) Hi gu...   Jun 10 2010, 15:57
- - slks   I don't know the technical details of S/PDIF, ...   Jul 3 2010, 05:47
|- - Centauri   QUOTE (slks @ Jul 2 2010, 23:47) I don...   Jul 27 2010, 11:42
|- - andy o   You're sending the decoded AAC and ALAC stream...   Jul 27 2010, 12:14
- - andy o   The Dolby Headphone device SU-DH1 can decode AAC t...   Jul 3 2010, 06:29
- - Centauri   Ah. Well, so long as the receiver's DAC is ge...   Jul 27 2010, 12:30
- - cowunder   i have the same problem. i've searced many sit...   Nov 24 2010, 14:50
|- - KFal   QUOTE (cowunder @ Nov 24 2010, 15:50) i h...   Nov 24 2010, 19:08
|- - cowunder   QUOTE (KFal @ Nov 24 2010, 19:08) QUOTE (...   Nov 25 2010, 12:05
- - ramicio   FFDShow is open source, get to programming. I...   Nov 24 2010, 17:11
- - citylimits   Good timing! I got this working last night, so...   Jan 5 2011, 20:33
- - savantique   What is MCC - Home Theater Edition? I've never...   Apr 7 2012, 07:33
- - andy o   I thought he meant that too, but it doesn't ma...   Apr 7 2012, 08:31
- - savantique   From what I understand, only specific hardware can...   Apr 7 2012, 09:37
- - andy o   I don't think so, but nobody is transmitting A...   Apr 7 2012, 15:36
- - savantique   How would I go about doing that, though? I definit...   Apr 7 2012, 15:51
|- - LOCKDOC   QUOTE (savantique @ Apr 7 2012, 16:51) Ho...   Dec 27 2012, 03:26
- - andy o   Well 3 years later I still don't know if it...   Apr 7 2012, 16:28
- - Pusherman   Have you tried new XBMC? I might remember wrong, b...   Apr 7 2012, 17:34

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