[mythtv] Yipee, almost there but audio whine

[Bryce C]

--=-iD2dxsKq2NTMtbabLt0l
Content-Type: text/plain
Content-Transfer-Encoding: quoted-printable

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?

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 if
> it was going through a ring modulation sound effect processor...).
>=20
> No tweaking at all would change this behavior (other than keeping the TV
> *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 mythTV
> (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 also
> 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

--=-iD2dxsKq2NTMtbabLt0l
Content-Type: application/pgp-signature; name=signature.asc
Content-Description: This is a digitally signed message part

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.0.6 (GNU/Linux)
Comment: For info see http://www.gnupg.org

iD8DBQA+FOL3/wbq/C6yyPcRAmjRAKCqSN4v8zaYb8CudWYj3zQMo0+fMQCgvHGZ
WFdIxYbNQKQtlAXWX4RxMrw=
=SdGc
-----END PGP SIGNATURE-----

--=-iD2dxsKq2NTMtbabLt0l--