On Wed, Feb 16, 2005 at 10:11:03PM -0800, Lonnie Borntreger wrote:
> If I understand things correctly, myth obtains the sound for a tv
> program it is recorded from the sound card, which gets its signal from
> the "loop" wire (taking the audio out from the tv card and putting it
> into the aux or line in on the sound card).  So, if you put two bttv
> based cards in one system, and they are looping through the same sound
> card, and it was recording two programs at once, wouldn't both
> recordings get the audio from both shows overlapped?  How does it
> separate the audio from the different cards?  Am I being stupid here and
> missing something simple?

You should try and get btaudio working.  It allows you to record sound
directly from the card over the PCI bus.  btaudio is a sound driver
that is included with the linux kernel.  Not every bttv card works with
btaudio though, I had two bttv cards at one point and I never could get
either to work.  I ended up with two audio cards to support the two
bttv cards.

Something else to keep in mind: capturing from three bttv cards will take
some significant CPU power.  Not out of the reach of a modern system 
probably, but if you're like me the backend is not exactly state of the art.

good luck!


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