[mythtv-users] Followed Digital Sound setup, many how-to's, and still completely lost.

Josh TwoOneSix at thatclothingco.com
Sat Feb 3 18:00:55 UTC 2007

Rich West wrote:
> *sigh*  I am reluctantly sending this to the listt, but no matter what I 
> try, I cannot seem to get consistent results from any of the "digital 
> sound" how-to's.
> Goal:
> Pump all sound out via SPDIF and let my receiver do the work.
> Near Goal:
> Hey, I would be content if I just had to switch the input on my receiver 
> from the TV setting (L/R stereo in)) to my DVD setting (Optical 5.1 
> Audio in).
> What I have tried so far:
> http://www.mythtv.org/wiki/index.php/Configuring_Digital_Sound#ALSA_Utilities, 
> http://gentoo-wiki.com/HOWTO_Dolby_Digital_Out_(AC3,_SPDIF) (I have FC5, 
> but I thought some of it might apply), along with following a couple of 
> threads in the list.
> Here's where I am at:
> Optical audio connection from S/PDIF to receiver is in place.
> Stereo L/R audio connection from stereo-out to receiver is in place.
> With no /etc/asound.conf or .asoundrc file, I can play output via the 
> command line: aplay -D plug:spdif english.au
> With a basic /etc/asound.conf set to have SPDIF by default (via the 
> gentoo wiki), I can't play english.au as above because of a format 
> error, but I can send static sound using a snipped of an ac3 stream that 
> I have if send to the default device or explicitly to the plug:spdif..  
> To my surprise, mpg321 happily plays my mp3's (although, the sound is 
> sped up slightly).  I can still specifically output to -D plug:spdif 
> successfully.
> With the asound.conf from the MythTV wiki (which explicitly states that 
> it is not needed for FC5 and FC6), I can still output to the specific 
> device -D plug:spdif
> Regardless of the above, mplayer properly sends out the ac3 audio over 
> SPDIF via either the command on the MythTV wiki or the one from the 
> Gentoo wiki.
> All of my tests with MythTV come up with nothing.  I've tried different 
> iterations of enabling AC3 to SPDIF pass through, setting the pass 
> through device to be "ALSA:defaut", "ALSA:spdif", "ALSA:plug:spdif", 
> "ALSA:iec958:{ AES0 0x02 }" (this one shows up in the pull down).  I've 
> also tried different audio output devices (/dev/dsp and /dev/adsp) with 
> the same options above.
> Of course, I could say the heck with it, and use mplayer as my default 
> DVD player.  However, I personally like the internal player to myth with 
> its better integration with the remote, the menu system (for video 
> adjustments), & etc.
> Although I've read the Wiki's, How-To's, and other postings, I just feel 
> like I am missing something simple here...
> -Rich
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> mythtv-users at mythtv.org
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I have been working with Digital Sound for the past 5 days straight... I 
may be able to help, but I need to know the hardware (sound card) your 
trying to use.


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