[mythtv-users] Alsa sound out

[Jarod Wilson]

On Saturday 27 November 2004 21:00, Peter Buelow wrote:
> >>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.
>
> This is what happens when you have an issue and spend hours googling. I
> finally found the note about nvsound not supporting alsa either. So,
> that's gone. I did some experimentation today though with it, and there
> are some diff's when sending raw AC3 to the stereo, so if it ever does
> support alsa, it might be worth it to switch. I guess I'll cross that
> bridge when I get there. But yeah, trying to use them both was not
> working well.

Two drivers trying to control the same device is definitely not good. The 
nvsound driver would have to be completely rewritten to operate under the 
ALSA framework. I've stayed strictly with ALSA drivers on all my boxes for 
some time, its just far better than OSS (obviously, since OSS was dumped in 
favor of ALSA in the 2.6 kernel).

> >>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).
>
> Cool, thanks. I didn't find the config file option, but the command line
> stuff, yeah. But does Myth actually use xine for anything? I haven't
> found it yet if it does. So, I'm currently not configured for it and
> unless there's a good reason, I probably won't. Love xine on my amd64
> FC3 box though. Works great.

The default settings in mythdvd and mythvideo use mplayer, but you can easily 
substitute xine. On the DVD side, xine is better than mplayer if you want to 
be able to use DVD menus. I'm now using xine for pretty much everything 
instead of mplayer.

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

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