[mythtv-users] Chaintech 7NIF2 Sound Problems

Ben Brown mythtv at handcoder.com
Mon Mar 29 14:54:18 EST 2004


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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