[mythtv-users] Alsa SPDIF NForce4

[Timothy Bish]

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> Timothy Bish wrote:
> > Need a little help getting ALSA to output everything to SPDIF, currently
> I
> > get nothing.
> 
> After having tried previously and given up, I gave onboard S/PDIF another
> shot
> last night.  I updated the kernel to the latest and greatest and went over
> some
> of the other messages in this thread.
> 
> Try the following:
> 
> 1) Delete /etc/asound.conf, if present...you don't need it.
> 2) In alsamixer, make sure these settings are as follows:
>    IEC958: unmuted
>    IEC958 Playback AC97-SPSA: 0%
>    IEC958 Playback Source: PCM
>    PCM: unmuted (level shouldn't matter, but mine is at 77%)
>    Master: unmuted (level shouldn't matter, but mine is at 77%)
> 3) Test PCM audio:
>    aplay /dev/urandom
>    You should get white noise.
> 4) Test AC3 passthrough:
>    mplayer -ao alsa -ac hwac3, dvd://
> 

Sweet with this straightforward info and some additional playing around I
was able to get everything working.  Thanks.



> One annoyance I found while watching something with an AC3 soundtrack last
> night was that in one hour, the stream glitched somehow and was
> interrupted a
> couple or three times.  With my receiver, that translates to a couple of
> seconds of silence as it switches from AC3 to PCM mode and back to AC3
> mode.  I
> had the MythTV audio device set to ALSA:default, but I'm going to try
> again
> with it set to /dev/dsp.  That should go through kernel-space OSS
> emulation.
> If it plays an hour or two without the receiver doing weird things, I'll
> consider my nForce S/PDIF problems fixed.  If not, I'll just switch back
> to the
> USB S/PDIF dongle I've been using and forget that I have an onboard
> output. :-P
> 
> (I had this same occasional AC3 dropout problem with the nForce2 I was
> using
> previously, and had never figured out a fix for it.)
> 
>   _/_
>  / v \ Scott Alfter
> (IIGS( http://alfter.us/            Top-posting!
>  \_^_/ rm -rf /bin/laden            >What's the most annoying thing on
> Usenet?
> 
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