[mythtv-users] Chaintech 7NIF2 Sound Problems

[Ben Brown]

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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