[mythtv-users] Dual tuners - how does the sound work?

[Robin Smith]

Sorry, I was confused on the bttv thing, go with Joe's advice. I have
the PVR-250, which does not require the connection to a sound card.

However, most of the Creativbe soundcards (the only ones I have ever
used) also have an Aux In connector, could you not hook the second
card up to  the Aux In and configure both to be recording sources?

This type of PITA certainly makes an even stronger argument for biting
the bullet when it comes to selecting a capture card and simply
spending the extra on the PVR-250 or 350.

Robin



On Wed, 12 Jan 2005 21:35:35 -0800 (PST), Joe Votour <joevph at yahoo.com> wrote:
> It depends on the capture card that is being used.
> 
> The PVR-x50/AverMedia M179, and other cards supported
> by the ivtv driver do not require a seperate cable for
> audio because the the sound is captured as part of the
> MPEG-2 stream.
> 
> However, cards controlled by the bttv driver (which
> are essentially frame grabbers) require some sort of
> sound capture.  Some cards work with btaudio, which
> generates a sound device (/dev/dspx, where x is a
> number) that MythTV can read from for the sound.
> 
> Cards that don't support btaudio require a connection
> to a sound card, so for every bttv card you have that
> does not support btaudio, you require a sound card,
> with a cable connecting the capture card to the sound
> card (on the Line-In port).
> 
> It is possible to have multiple sound cards in a PC,
> as long as you have enough PCI slots for them.  This
> tends to be a problem for people with bttv cards,
> since you wind up with two problems - bttv cards
> require a lot more CPU than a PVR-x50 card, and you'll
> run out of PCI slots quickly.
> 
> -- Joe
> 
> --- Robin Smith <1canuck2 at gmail.com> wrote:
> 
> > I have no cable from my tuner card to my soundcard.
> > The tuner card
> > "captures" the audio along with the video. The
> > soundcard is only for
> > playback.
> >
> >
> > On Thu, 13 Jan 2005 14:15:52 +1100, Phill Edwards
> > <philledwards at gmail.com> wrote:
> > > I currently have a bt878 chip tuner card and I
> > want to buy a 2nd one
> > > but I don't understand how the sound recording can
> > possibly work on
> > > this setup. From what I understand at the moment,
> > the sound gets
> > > recorded by connecting a lead from the sound out
> > from the tuner card
> > > to the line in of the sound card (which in my case
> > is  on-board). If
> > > that lead is not connected in this way then I'll
> > get a video recording
> > > with no sound. Am I right so far?
> > >
> > > So, when I put a 2nd tuner card in how do I
> > connect the sound out to
> > > the line in of the sound card when it's already
> > been taken up by the
> > > 1st tuner card? Is this when you need btaudio? I
> > believe not all tuner
> > > cards support btaudio. How can I determine which
> > do and which don't -
> > > from what I've seen it seems to just be some
> > Hauppauges and WinTV
> > > Radio?
> > >
> > > Are my options as follows:
> > >
> > > 1) Buy a sound card when I buy a tuner card, OR
> > > 2) Buy a tuner card that supports btaudio (very
> > limited choice and
> > > expensive, I believe)
> > >
> > > Lastly, my mobo has a S/PDIF connector which I
> > currently have no idea
> > > how to use but I do want to get Dolby digital
> > working in the future
> > > for DVD playback. Does this have any bearing on
> > what sort of sound
> > > card I should buy if I go for option 2?
> > >
> > > Regards,
> > > Phill
> > >
> > >
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