[mythtv-users] Digital Audio and MythMusic...

Michael T. Dean mtdean at thirdcontact.com
Mon Jan 21 20:06:20 UTC 2008

On 01/21/2008 02:31 PM, Noah Markon wrote:
> I've had some issues with my digital audio while listening to my music
> collection, basically everything some out too fast, or it's pitch is
> too high. I understand this is because it's coming out of my PC at
> 48Khz, while it should be at 44Khz, or maybe the other way around.
> Anyway I had a rough time getting digital audio to work in the first
> place, I ended up having to put /dev/adsp in as my Audio output
> device, when i use ALSA:default I get no sound.
> I'm using Ubuntu, 7.04 (I think) my sound card is a chaintech av-710.
> The wiki is helpful, but seems to be for Fedora Core, and I'm not sure
> how much applies to ubuntu.

Heh.  The ALSA configuration file at
http://www.mythtv.org/wiki/index.php/Configuring_Digital_Sound was 
developed on and for a system that is nothing like Fedora Core (nor like 
Ubuntu).  It should work, though, on any system that uses ALSA.

The Fedora-centric nature of the page is just a result of a lot of 
Fedora users putting Fedora-specific info (much of it is flat wrong, 
anyway) in there.  :)  (Before anyone complains about my laziness, I 
gave up trying to correct that page because it's a catch-22.  If I 
delete the incorrect information someone just re-adds it later.  If I 
completely explain the information, no one reads it because it's such a 
long complicated description, so they add a new, wrong comment or, 
worse, change my correct description to be incorrect.)

>  Anyway one got any suggestions?

It's the sound card you're using (not the distro) that makes things 
different.  Once you learn your sound card hardware intimately and learn 
ALSA configuration far better than you care to learn, it's really rather 
easy.  If you're not interested in doing that, I recommend the ALSA 
config file from the wiki as a starting point--then you only need to 
learn the sound card hardware (and the alsamixer view of that hardware).  :)

Note, also, if you're doing AC-3/DTS passthrough, you should probably 
set your passthrough device to ALSA:iec958.

Good luck,

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