[mythtv-users] Chaintech 7NIF2 Sound Problems

[Matt Redmon]

I haven't tried that.  I'll do so in a couple days when I get my system back
up and running (I am currently putting an lcd window and screen into my
custom case and rearranging some of the internal wiring).

Matt


> Thanks for the email Matt, I'll try this when I get home.  Offhand, do
> you know if you get this buzzing by trying to play straight of the dsp?
> in other words, do you get the buzzing when you aplay /dev/dsp?
>
> Thanks
> Ben
>
> Matt Redmon wrote:
>
> >I've got a 7NIF2 running full-duplex just fine.  I've got a TV Wonder VE
in
> >a custom (gutted component cd player) case with the audio output going
into
> >the line-input of the motherboard.  Volume control works perfectly.  The
> >only problem I've had with the sound is a strange buzzing (live tv and
> >recordings) that went away when I bumped up my mp3 frequency to 48khz.
Now
> >everything is working wonderfully in live tv, recordings, dvds, etc.
> >
> >Matt
> >
> >
> >
> >
> >
> >
> >>This was my fear.  I've built this into a half height Case, and I'm not
> >>having any luck finding a half height sound card.  so I'ts buy a new
> >>case or buy a new card.  Thanks
> >>
> >>
> >>Ben
> >>
> >>Dalen Kruse wrote:
> >>
> >>
> >>
> >>>I was having the same problems with that board.  What I found out
> >>>
> >>>
> >(someone
> >
> >
> >>>correct me if I'm wrong) is that the on-board sound does not support
> >>>full-duplex.  If your experience is like mine, it sounds great when
> >>>playing a sound file through XMMS or watching TV with XawTV, but
horrible
> >>>when watching TV with Myth.
> >>>
> >>>There are three solutions to this problem.
> >>>
> >>>1. Make this machine a dedicated backend that only does the recording.
> >>>That way you don't need full-duplex sound.  The downside is that you'll
> >>>need another machine for a dedicated frontend.  Most expensive option.
> >>>
> >>>2. Dump the bttv card and buy yourself a PVR-250 or -350.  The sound is
> >>>encoded directly into the MPEG-2 stream, so your on-board sound doesn't
> >>>need to do the recording.  Second most expensive option.
> >>>
> >>>3. You can do what I did.  Disable the on-board sound in your BIOS and
> >>>find yourself a separate full-duplex sound card.  I'm currently using a
> >>>SoundBlaster Live 5.1 PCI card and it sounds great.  Depending on where
> >>>you buy it, this card can run you $35 to $50.  If you do get a separate
> >>>sound card, MAKE SURE it will do full-duplex.  BTW, stay away from
CMedia
> >>>chipsets.  The older ones (i.e. 8739) supported full duplex, but cut
the
> >>>sampling rate in half so you still had terrible sound.
> >>>
> >>>Hope this helps.  This was my most frustrating part of building my Myth
> >>>box.  It's running rock solid now and I'm very happy with the results.
> >>>
> >>>--B
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>>I know this isn't the alsa mailing list, but I know many people use
this
> >>>>board in their Myth Boxes, so I thought I'd ask.  Is anyone using the
> >>>>onboard audio for sound capture.  I have this board with a bttv card,
> >>>>and I'm getting horrible audio.  When I aplay /dev/dsp the audio is
> >>>>really crackly, and it plays at a set volume.  Changing the master
> >>>>volume doesn't affect the sound output at all.  Playing other sounds
> >>>>works  fine.  Xawtv sounds fine and the volume controls work.  It's
only
> >>>>the playing the dsp that doesn't work.
> >>>>
> >>>>The sound from the bttv card runs into the cdaudio jack on the MB, and
> >>>>I'm using alsa 1.03 and the latest Nforce drives on Mandrake 9.2.
> >>>>
> >>>>Has any one had similar problems?
> >>>>
> >>>>Thanks
> >>>>Ben
> >>>>_______________________________________________
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> >>>>
> >>>>
> >>>>
> >>>>
> >>>
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> >>>
> >>>
> >>>
> >>>
> >>>
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> >
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