[mythtv-users] Onboard sound full-duplex ?

Maarten mythtv at ultratux.org
Wed Oct 13 19:06:01 UTC 2004

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.

So I really think this is not an option.  Example: a recording on card_1 
starts at time T. At time T+10 you select "watch TV", but the only free card 
card_2 cannot playback sound simultaneous with recording. So that won't work, 
ie. you get no sound then.  Isn't that correct ?

So back to the original question: Can anyone confirm or deny that the onboard 
sound AC97 function of the VIA KT400 chipset can handle full-duplex or not ? 


> Isaac
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