[mythtv-users] No Sound with nForce chipset <--- FIXED!
Ryan Allen
ryan at the-summit.net
Tue Jun 22 22:23:11 EDT 2004
I agree. I tried to get that setup working, by using many different
HOWTO documents scattered all over the Internet. Nothing seemed to
work. I was very desperate to get _anything_ working at all, and by
disabling XvMC, I can actually use the machine.
The CPU seems to stay very low, which tells me I am getting HW encode
from the 350.
But I believe I am using software decode (TV out s-video on the nForce
video card), because a slight tearing during quick motion.
I tried to pipe the output from the 350 into the input of the nForce
sound card with no avail. Yes, I did change the line-in and input
setting with alsa mixer and with test_ioctl utility. I actually spent
about 3 days solid trying to make the system work like that.
I'm relieved that I actually, finally, have a working system. Now that
I have a good baseline, I will experiment with more complex setups, and
_hopefully_ get to take advantage of my hardware much better.
The document at http://www.mythtv.info/moin.cgi/DigitalSoundHowTo
attempts to address my setup exactly, but leaves me with more questions
than answers. I will compile them and post to this list soon.
Thanks for the info!
-- Ryan
* David <myth at dgreaves.com> wrote on [06-21-04y 15:00]:
> That's odd.
>
> I think you may have disabled your PVR350's decoder for sound *and* video.
> Now it's using the framebuffer to play video and the soundcard to play
> audio.
>
> Which is going to increase the cpu usage a lot, and probably decrease
> video quality (jerking/tearing?)
>
> Do you have the sound output of your PVR350 piped back into the line-in
> on your soundcard?
> And then under alsamixer *unmute* the line-in (and set it as capture)
> That gives really quite good analog sound.
> s/pdif is more tricky (it doesn't work) because you need to sample the
> line-in at 48kHz and feed it back out the pcm to the s/pdif there is a
> workaround, see here: http://www.mythtv.info/moin.cgi/DigitalSoundHowTo
> for some more hints.
>
> David
>
> Ryan Allen wrote:
>
> >Hi all,
> >
> > Thanks for the support. Unfortunately, nobody's help pointed me in
> > the right direction. There seems to be a lot of conflicting info
> > out there, along with a few dead end threads. I even saw a post
> > somewhere of "Do you have nForce chipset, a PVR x50 and the CD rom
> > as the master device on the secondary interface????" with no follow
> > up. (That is my exact setup, so what was up with that).
> >
> > ANYHOW, I had to:
> >
> > I DISABLED in setup:
> > USE HW XVMC MPEG DECODING
> > (which was on by default)
> >
> > and finally everyting worked.
> >
> > -- Ryan
> >
> >
> >
> >* John Kuhn <kuhn at razorsys.com> wrote on [06-21-04y 12:00]:
> >
> >
> >>it might be as simple as editing your .fvmw2 file and changing this
> >>
> >>#exec KnoppMyth-run
> >>exec mythfrontend
> >>
> >>it seems the knoppmyth-run script will knock out sound in some cases (it
> >>did it to me)
> >>
> >>--John
> >>Mythtv.info
> >>
> >>Ryan Allen wrote:
> >>
> >>
> >>
> >>> First off, knoppmyth totally rocks. I wasted a good week trying to
> >>> get Myth to work on SuSE 9.0, then I switched to this. Thanks for the
> >>> good work!
> >>>
> >>> However, I still have NO sound. I've been searching and have found
> >>> references on some sticky thread on my problem, but I cannot find it.
> >>> Here's the lowdown:
> >>>
> >>> It's a MSI MEGA 180 box that has the nForce chipset.
> >>> Athalon 2500+ (barton)
> >>> 512 M ram
> >>> PVR 350
> >>>
> >>> Now, I've got everything working, except sound. There is no sound
> >>> out from either the SPDIF, the analog out on the sound card nor the
> >>> PVR.
> >>>
> >>> so looking in /etc/modules.conf it says:
> >>>
> >>> alias snd-card-0 snd-intel8x0
> >>>
> >>> which is wrong, so naturally I did an "lsmod" and as expected:
> >>>
> >>> ---< snip >---
> >>> snd-mixer-oss 11640 0 [snd-pcm-oss]
> >>> snd-intel8x0 17636 0
> >>> snd-pcm 56000 0 [snd-pcm-oss snd-intel8x0]
> >>> snd-timer 14088 0 [snd-pcm]
> >>> snd-ac97-codec 32832 0 [snd-intel8x0]
> >>> snd-page-alloc 4316 0 [snd-intel8x0 snd-pcm]
> >>> snd-mpu401-uart 3168 0 [snd-intel8x0]
> >>> snd-rawmidi 13088 0 [snd-mpu401-uart]
> >>> snd-seq-device 3824 0 [snd-rawmidi]
> >>> snd 27940 0 [snd-pcm-oss snd-mixer-oss snd-intel8x0 snd-pcm
> >>> snd-timer snd-ac97-codec snd-mpu401-uart snd-rawmidi snd-seq-device]
> >>> soundcore 3524 3 [snd]
> >>> ---< snip >---
> >>>
> >>> so, I'm thinking I need to compile the nForce linux platform
> >>> drivers. So, I obtained the latest tar.gz and when I type "Make",
> >>> the compile fails with the following (parsed for clarity) messages:
> >>>
> >>> /usr/include/asm/mpspec.h:6:25: mach_mpspec.h: No such file or
> >>> directory
> >>>
> >>> /usr/include/asm/mpspec.h:8: error: `MAX_MP_BUSSES' undeclared here
> >>> (not in a function)
> >>>
> >>> /usr/include/asm/smp.h:73:26: mach_apicdef.h: No such file or
> >>> directory
> >>>
> >>> In file included from nvhw.c:16:
> >>> nvhw.h:29:27: linux/wrapper.h: No such file or directory
> >>>
> >>> /usr/include/asm/irq.h:16:25: irq_vectors.h: No such file or
> >>> directory
> >>>
> >>>
> >>> And a few others. My question is, where did I go wrong, and how does
> >>> one get the nForce audio to work on knoppmyth?
> >>>
> >>> Thanks!!
> >>>
> >>> -- Ryan
> >>>
> >>>
> >>>
> >>>------------------------------------------------------------------------
> >>>
> >>>_______________________________________________
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> >>>mythtv-users at mythtv.org
> >>>http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
> >>>
> >>>
> >>>
> >>>
> >
> >
> >
> >>_______________________________________________
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> >>
> >>
> >
> >
> >
> >
> >------------------------------------------------------------------------
> >
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> >
> >
>
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--
+-------------------------------+
| ryan at the-summit.net |
| http://www.pnwtripreports.com |
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