[mythtv] I dont know, its freaking me out.

[Bruce Markey]

Chris wrote:
> I thought you needed two soundcards for two tuners.  I have installed
> two tv tuners and have onboard cmi8738 and instlled an sb live 5.1 card
> as well.  Couldnt seem to make the two sound cards agree with each
> other.  Then after a series of failed configurations ,suddenly I can run
> mythtv and do picture in picture and swap the pip and main window.  Both
> of them have sound which is synced with the video.  Then I looked at the
> back of the PC and saw that I have NOT yet connected the line out of the
> ati tv tuner ve to the sb live 5.1 line in.  There is nothing connected
> to the sb live 5.1 at all.  The ati tv wonder PCI is connected to the
> cmi8738 at its mic in jack.  My speakers are connected to the line out
> of the cmi8738.  How did the ati tv wonder ve audio find its way to
> mythtv?  How is this possible?  I have not yet verified If i can record
> with audio from each of the tuners.  Still tryng the mythfilldatabase
> but I never expected this.  Is there a logical explanation or am I
> simply not understanding audio configuration.  

Harondel Sibbie has been down this road before! It was
fun figuring it out 8-). You would assume that when you
press "v" that the two tuner cards swap roles. However,

- N swaps the two channels

from keys.txt means that each card changes channels. The
first card is always fullscreen and the second is always
PIP.

Confirming the sound for the second card is what lead to
the testing suggested in 17.11 of the docs.

http://www.mythtv.org/docs/mythtv-HOWTO-17.html#ss17.11

Once this test works for the first card, do the same test
for "xawtv -c /dev/video1" and "aplay /dev/dsp1". Not only
will this verify that sound works for the second card but
you can alternate between /dev/dsp and /dev/dsp1 to make
sure the volume levels are equal.

--  bjm