[mythtv-users] Chaintech 7NIF2 Sound Problems

[Matt Redmon]

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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