[mythtv-users] Multiple Plextor Audio Solution ???

[Nathan Lutchansky]

On Sun, Feb 12, 2006 at 12:49:32AM -0500, Jesse Guardiani wrote:
> On Sunday 12 February 2006 12:03 am, Brian Wood wrote:
> > On Feb 11, 2006, at 9:47 PM, Nathan Lutchansky wrote:
> > > I'm sorry if I'm being dense here, but I still don't understand
> > > why  you would need an extra sound card to use a second Plextor
> > > unit.  The ConvertX has an ADC inside so you can record from the
> > > RCA ports,  and the ConvertX appears on the Linux system as an
> > > ALSA device separate  from any sound cards you might have
> > > installed.  You can even use one or more Plextor ConvertX boxes
> > > with the MythTV backend without any sound  card at all, as long as
> > > you have ALSA compiled into your kernel.
> > 
> > Maybe I'm being dense (wouldn't be the first time).

I didn't mean to be rude; I just wanted to make sure this isn't a
problem with the hardware or driver that I wasn't aware of.

> > I see that /proc/asound/cards does in fact show the Plextor as a
> > "card", but with no address or IRQ.
> > 
> > How would I go about having this source show up to ALSA as separate
> > source? At present I have "/dev/dsp1" as the sound device in MythTV
> > for the Plextor, what could I select to get the sound recorded other
> > than that? How could I get sound on live playback unless I select
> > something that is an input to the mixer?
> 
> The question might be where you have dsp1 set, currently. You only
> need it in mythtv-setup, not the frontend, AFAIK. The frontend should
> use /dev/dsp, or 'ALSA:default' or whatever. So, since dsp1 is created
> by the plextor software driver, one might assume that a second plextor
> unit would create dsp2, which you could then specify in mythtv-setup
> for your second card.

Sounds right to me.  Once you get up to a certain number of sound cards
(either four or eight) you run into a device number limit, but up to
four total sound cards + ConvertXes will definitely work, numbered
/dev/dsp, /dev/dsp1, /dev/dsp2, and /dev/dsp3.

> I don't think LiveTV works with the Plextors in 0.18.1. I think I read
> that this has been fixed in 0.19.

When you try Live TV do you get green garbage with some moving stuff at
the top?  If so, that's probably the misconfigured recording profile
problem that everyone runs into...  -Nathan
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