[mythtv-users] Onboard sound full-duplex ?

[Maarten]

On Wednesday 13 October 2004 21:27, Isaac Richards wrote:
> On Wednesday 13 October 2004 03:06 pm, Maarten wrote:
> > On Wednesday 13 October 2004 20:28, Isaac Richards wrote:
> > > On Wednesday 13 October 2004 02:11 pm, Maarten wrote:
> > > > On Wednesday 13 October 2004 19:29, Tim Sailer wrote:
> > > > > On Wed, Oct 13, 2004 at 07:03:18PM +0200, Maarten wrote:
> > > > >
> > > > > Card 1 being the first capture card or the first sound card? You
> > > > > specify the audio device for playback, so you can always play out
> > > > > through the builtin device.
> > > >
> > > > With card_1 I meant the first capture card, not the first soundcard.
> > > > But I don't really think that makes any difference; you'll have two
> > > > combos of <<capture card + connected soundcard>>.  And if one of
> > > > those combos lack full-duplex, it will not be able to playback (or
> > > > -worse- it could fsck up the ongoing recording when selecting it for
> > > > playback).
> > >
> > > Why would you be using multiple soundcards for playback?
> >
> > Hm.  Okay, so maybe I'm confused, but I need a soundcard each for each
> > BT8x8 capture card, right ?  So either both those soundcards need to be
> > able to do full-duplex (otherwise live TV and playback will have no
> > sound) OR one must have the possibility within mythtv to declare one card
> > capable of recording and playback, and the other capable of _only_
> > recording. (And mythtv reacting accordingly...)  Is this assumption
> > correct so far ? Note that I'm _not_ talking about PVR250 cards, but
> > about BT8x8 cards.
>
> You're  not even close to being correct.   Why would you be using more than
> one sound card for _playback_?  Why would you think that the device used to
> playback audio is tied in any way to the device used to record audio?

Hm, okay.  Thanks :-)  So you're effectively saying that I should define (in 
Mythtv Setup) that my good soundcard is /dev/dsp0 and my 'bad' soundcard is /
dev/dsp1 (and connecting my amplifier to /dev/dsp0 output of course) and all 
will work fine, despite soundcard 2 (/dev/dsp1) being substandard.  Right ?

You ask why I thought that ?  I guess I assumed that since the TV cards and 
soundcards are tied together (with the little jumper wires) that that also 
applied for playback.  Wrongly so, I now realise...

If so, that's great news.  On to my next problem, tweaking everything like 
resolutions and recording filters et al so that one, lightly overclocked, 
Athlon 2600+ can indeed cope with two simultaneous BT8x8 recordings...  
Which will be a difficult task upon itself, if I read it correctly. ;-) 

> Isaac

Thanks,
Maarten

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