[mythtv-users] Alsa sound out

[Jarod Wilson]

On Saturday 27 November 2004 16:50, Peter Buelow wrote:
> Well, the big issue was that I had missed the MythMusic not having alsa
> support. So, it obviously doesn't work with the alsa directive. Now I've
> got /dev/adsp installed and there is sound coming out. Still some volume
> issues, but that was with some old test mp3's, so they might have a
> funky volume or something (or more alsamixer tweaking I guess). More
> tests later this evening.

Ah yes, I'd forgot about that also. Haven't used MythMusic in quite a while.

> The TV issues puzzles me more. It may have had something to do with
> trying to use both nvsound and the intel drivers, but I'm not sure.

Ew, that's a very, very, very bad thing, pretty much guaranteed to cause 
problems.

> It 
> didn't work before I tried the nvsound stuff as well. But this
> afternoon, recreated the capture card in setup, and then attached it to
> ALSA:spdif, and it magically works. Dunno why. So, now I have sound all
> throughout.

Go figure...

> One other question about digital outputs. Will AC3 be automagically
> passed through no matter what?

No. You have to check the box for "enable AC3 passthrough" in mythfrontend for 
MythTV to pass AC3. Both mplayer and xine (and Ogle, I presume) have to be 
configured independently to pass raw AC3.

My ~/.mplayer/config file has this in it:

ac=hwac3,

The comma says "fall back to whatever is auto-detected, if not AC3".

For xine, I've got these in ~/.xine/config:

audio.speaker_arrangement:Pass Through

audio.alsa_a52_device:spdif

I believe both of those were actually set using the Xine configuration UI.

(Yes, to those who might be wondering, I'm finally adding xine info to my 
docs).

> I haven't played with a full surround 
> setup yet (will be moving this machine to the home theater tomorrow I
> hope), but the receiver I have it hooked up to doesn't seem to notice
> it's surround coming from DVD's or video's. Also, mplayer seems to
> indicate that the output is down sampled to 2 channel. I'm gonna hunt
> through the mplayer help tonight as well and see if that provides more
> clues though.

See above. :-)

-- 
Jarod C. Wilson, RHCE
jcw at wilsonet.com

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