[mythtv] Yipee, almost there but audio whine

[Bryce C]

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It still doesn't work.  On a considerably more interesting note, I did
an "arecord >test" and then "aplay test" and it was flawless.

On Thu, 2003-01-02 at 18:10, Bryce C wrote:
> I had tried the btaudio driver initially but I could never get it to
> work but now that I know my setup DOES work basically, I think I'll try
> it again.  Just to verify, you're saying that you're using the digital
> dsp device at 32000 and it works for live and recording?
>=20
> On Thu, 2003-01-02 at 17:44, Chris Liscio wrote:
> > I actually just got my new mainboard which was equipped with a VIA8233A
> > SouthBridge and a Realtek ALC101 audio codec chip.
> >=20
> > When I first started MythTV with this chipset it was horrible-sounding.
> > I couldn't figure out what exactly was wrong.  I tried xawtv with the
> > Aux line enabled and it sounded just fine.  I am guessing it had to do
> > with the fact that it was just analog in to analog out straight-through=
.
> >=20
> > So I used arecord and aplay to verify that recording internally to the
> > chipset produced horrid results (crackly, fuzzy audio that sounded as i=
f
> > it was going through a ring modulation sound effect processor...).
> >=20
> > No tweaking at all would change this behavior (other than keeping the T=
V
> > *very* quiet) and I was stumped for all of 2 hours.  I remembered that =
I
> > could just use the btaudio module for recording, and keep using my
> > (perfectly fine for PCM) ALC101 for playback.
> >=20
> > After mucking around and making sure all the OSS stuff worked properly
> > (now I have /dev/dsp0, dsp1, and dsp2) and was set up properly in mythT=
V
> > (in cvs, you'll have to go into the database and change the input audio
> > device...in older versions this just involves a text file edit).  I als=
o
> > stumbled on the fact that you could only record at a sampling rate of
> > 32000 briefly.
> >=20
> > Starting mythTV up again (and with my fingers and toes crossed) I was
> > pleased to hear everything working correctly.  It now sounds as
> > fantastic as it ever did.
> >=20
> > Hope this solves your problem.  The ALC101 is a *very* cheap audio
> > device and they most likely use crappy ADCs and DACs and mixers
> > internally to do all the mixing and recording.
> >=20
> > On another note, the GrooveBox appears to be a go... :)
> >=20
> > Cheers,
> > Chris
> >=20
> > -----Original Message-----
> > From: mythtv-dev-admin@snowman.net [mailto:mythtv-dev-admin@snowman.net=
]
> > On Behalf Of Tony Clark
> > Sent: Thursday, January 02, 2003 5:15 PM
> > To: mythtv-dev@snowman.net
> > Subject: Re: [mythtv] Yipee, almost there but audio whine
> >=20
> >=20
> > On Thursday 02 January 2003 22.58, Bryce C wrote:
> > > Just the high pitched whine and sometimes the voices are a bit=20
> > > "warblely".
> >=20
> > You may have the AC97 level turned up, I think I got some sort of
> > feedback=20
> > with my SBlive card when I had the AC97 level up.  I guess your using
> > alsa?
> >=20
> > tony
--=20
Bryce C <Plug@BryceCo.Net>
CoBryce Communications

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