[mythtv-users] Re: Help me find a winner...stinking Kt133

[Joe V]

I have a KT133-based board for my MythTV PC (which is
temporary, I just built it out of stuff I had around
the apartment).  My CMI8738 on-board sound doesn't do
full-duplex very well either (with ALSA, I don't think
I tried OSS).

With ALSA, doing full duplex, the regardless of what I
set the mixer settings to, the sound would always be
very low, and turning up the speakers would emit a
loud hiss.

>From what I recall on the ALSA mailing list, this is a
known issue with the CMI8738 driver.

My solution was to get another sound card.  I bought a
Soundblaster 16 PCI (based on the Ensoniq 1371 chip,
although it's identified as a Creative 5880), and it
seems to be working well (bought it because it was
cheap, $30).  The sound is a little strange (almost a
bit "bassey", with some slur to it), but I'm not sure
if that's the sound card, or the the incoming video
(could also be my mixer settings).  This is using
full-duplex with ALSA, perhaps if I dedicate one card
to the capture input, and another card to the output,
the problem might go away.

But, like I said, I haven't had much luck with the
CMI8738 sound in full-duplex.

-- Joe

--- Edmund Wong <ed at guyline.com.hk> wrote:
> > > The onboard sound might not be the greatest,
> however. It's an AC97 codec 
> > > based around the Realtek 9738 chip. Not sure how
> good the line-in quality 
> > > is on it. Anybody want to chime in here? 
> 
> Wait, Realtek? I typed that? I must be on crack or
> something. I meant
> C-Media.
> 
> > The on-board sound is simplex, locked at 48kHz,
> distorts if you have 
> > the volume at > 95%, and too quiet to drive
> speakers directly. But 
> > other than that, it plays sound great! :-) No
> probs with the quality. 
> > 
> > I bought a second sound card to handle line-in,
> and use the on-board 
> > for line out. In a stroke of bad luck, the 5.1
> CMI-based soundcard I 
> > bought uses the line-in control for recording
> volume, so I can't just 
> > that sound card for mythtv :-( 
> 
> If it's locked at 48khz, it's fine for playing
> MythTV recordings but
> would potentially cause problems with some of the
> other modules. Any
> comments on the quality of the line-in? I'm planning
> a MythTV box around
> a similar board and I would flip the functions of
> the two if it came
> down to it, personally. Unless, of course, if the
> onboard sound can be
> wrangled into supporting other sampling rates.
> 
> Also, has anybody run the onboard sound in
> full-duplex?
> 
> - ED.
> > _______________________________________________
> mythtv-users mailing list
> mythtv-users at mythtv.org
>
http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
> 


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