[mythtv] Yipee, almost there but audio whine

[Bryce C]

--=-SDyzbVyBCn1QpIGKO2D8
Content-Type: text/plain
Content-Transfer-Encoding: quoted-printable

When I WAS TRYING to use btaudio, it created /dev/sound/dsp[1-4] and
/dev/sound/mixer[1-2] because I have two cards that have separate
purposes (one only does composite) and and are accessed separately.=20
dsp[3-4] are the only one's I'm concerned with but I tried a sox on
dsp[1-2] too and here's what I found. The digital ones said nothing, no
"Recording at a rate of 8000 of type WAVE" or whatever it was.  It just
sat their.  Also, yes, ,I am using alsa because oss didn't seem to work
before and it took a lot of work to get alsa installed so i'm not about
to try again.  The arecord was used after I reverted to ALSA so yes, it
was using ALSA's line-in.
I think I've found the problem in a poor quality implementation of
full-duplex capability on my sound chip so i'm going to try another one.

On Thu, 2003-01-02 at 19:25, Chris Liscio wrote:
> That is certainly strange.  For me, doing what you've done did not yield
> good results at all.
>=20
> I know for one thing that I used sox to do the recording from the oss
> device /dev/dsp1 manually rather than using arecord (to guarantee it was
> using the right input device).  It *is* possible that when you're doing
> arecord >test you are still using the Auxillary input on your sound
> chip.  Someone feel free to correct my highly uninformed hypothesis
> though...
>=20
> Also, you must make sure that you are setting mythTV to use the bttv
> device for recording, and the alsa device for playback.
>=20
> That's about as much as I can offer right now.  YMMV.
>=20
> Cheers,
> Chris
>=20
> -----Original Message-----
> From: mythtv-dev-admin@snowman.net [mailto:mythtv-dev-admin@snowman.net]
> On Behalf Of Bryce C
> Sent: Thursday, January 02, 2003 8:30 PM
> To: mythtv-dev@snowman.net
> Subject: RE: [mythtv] Yipee, almost there but audio whine
>=20
>=20
> It still doesn't work.  On a considerably more interesting note, I did
> an "arecord >test" and then "aplay test" and it was flawless.
>=20
> 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=20
> > work but now that I know my setup DOES work basically, I think I'll=20
> > try it again.  Just to verify, you're saying that you're using the=20
> > 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=20
> > > VIA8233A SouthBridge and a Realtek ALC101 audio codec chip.
> > >=20
> > > When I first started MythTV with this chipset it was=20
> > > horrible-sounding. I couldn't figure out what exactly was wrong.  I=20
> > > tried xawtv with the Aux line enabled and it sounded just fine.  I=20
> > > am guessing it had to do with the fact that it was just analog in to
>=20
> > > analog out straight-through.
> > >=20
> > > So I used arecord and aplay to verify that recording internally to=20
> > > the chipset produced horrid results (crackly, fuzzy audio that=20
> > > sounded as if it was going through a ring modulation sound effect=20
> > > processor...).
> > >=20
> > > No tweaking at all would change this behavior (other than keeping=20
> > > 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=20
> > > properly (now I have /dev/dsp0, dsp1, and dsp2) and was set up=20
> > > properly in mythTV (in cvs, you'll have to go into the database and=20
> > > change the input audio device...in older versions this just involves
>=20
> > > a text file edit).  I also stumbled on the fact that you could only=20
> > > record at a sampling rate of 32000 briefly.
> > >=20
> > > Starting mythTV up again (and with my fingers and toes crossed) I=20
> > > was pleased to hear everything working correctly.  It now sounds as=20
> > > fantastic as it ever did.
> > >=20
> > > Hope this solves your problem.  The ALC101 is a *very* cheap audio=20
> > > device and they most likely use crappy ADCs and DACs and mixers=20
> > > 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=20
> > > [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
> > > > "warblely".
> > >=20
> > > You may have the AC97 level turned up, I think I got some sort of=20
> > > feedback with my SBlive card when I had the AC97 level up.  I guess=20
> > > your using alsa?
> > >=20
> > > tony
--=20
Bryce C <Plug@BryceCo.Net>
CoBryce Communications

--=-SDyzbVyBCn1QpIGKO2D8
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+FQFJ/wbq/C6yyPcRAp3iAKCLYFFAAicFOmkherRTF0PPjIXNsACgtI8A
uYt/jEw/HCfDqhnXr7gs1Qc=
=SPHf
-----END PGP SIGNATURE-----

--=-SDyzbVyBCn1QpIGKO2D8--