[mythtv] Fw: [mythtv-users] Myth is locking soundcard and preventing fullduplex operation

[Edward Wildgoose]

Sorry to cross post this to the dev list.  Having looked at this a little
more I think it is a suitable question to put to the developers.

Could someone please talk me through what is happening when mythtv records
and why this might be blocking my card from playing.  To be clear I can
record and play simultaneously with aplay/arecord - the problem is I can't
play two channels at once and I suspect that mythtv is also trying to play
some silent channel when it is recording?

Anyone able to advise on how to debug this further please?

----- Original Message -----
From: "Edward Wildgoose" <edward.wildgoose at frmhedge.com>
To: "Discussion about mythtv" <mythtv-users at snowman.net>
Sent: Sunday, April 13, 2003 11:21 PM
Subject: Re: [mythtv-users] Myth is locking soundcard and preventing
fullduplex operation


> Re-reading this I think the grammar was appalling and I failed to explain
my
> problem - sorry....
>
> The point is that my sound card only appears to be able to play a single
> audio stream and that when mythtv is *recording* from the TV it seems to
be
> using up my single channel for *playing back* sound....?
>
> Can someone confirm that this is happening, or that when mythtv is
recording
> it is doing anything else which might be locking the play device in some
way
> which is causing the problem.
>
> The point is that the RME card has no built in mixer and so I presume that
I
> would need to install JACK or something similar to play multiple audio
> streams, however, this ought to be unneccessary?
>
> Thanks
>
> ----- Original Message -----
> From: "Edward Wildgoose" <edward.wildgoose at frmhedge.com>
> To: "Discussion about mythtv" <mythtv-users at snowman.net>
> Sent: Sunday, April 13, 2003 7:29 PM
> Subject: [mythtv-users] Myth is locking soundcard and preventing full
duplex
> operation
>
>
> > Having raved about the sound quality of my new RME audio card I have now
> > tried to use it with Myth and run into a small problem which I'm not
sure
> > who to debug further.  It is clearly a full duplex issue, but how and
why?
> >
> > Basically if I record a tv show and then play it back when nothing is
> > record, sound is OK.  However, live tv gives no sound, and if I switch
> back
> > to the console and attempt to fire up XMMS then it errors and says that
> > something is blocking the sound device (no sound from XMMS).
> >
> > However, I can use arecord to record to a file and then use aplay to
start
> > playing back the same file simultaneously - with xawtv up this gives me
a
> > lagged tv sound.  Also playing back CD's and everything else is
basically
> > fine.
> >
> > I previously had an Audigy in the machine and I have changed all the
> > settings as per the Alsa setup so that everything now refers to the new
> RME
> > card.  It all looks right.
> >
> > The only clue is that the RME card has no internal mixer, so it is
> > impossible to play back several tracks at once.  I tried using aplay to
> send
> > some junk to the output, then opened up xmms and hit play - nothing
> happened
> > until aplay finished and then xmms burst into life (at the beginning as
> > though it had been frozen while aplay was running).  Could it be that
myth
> > is also locking the "play" channel when it is recording?
> >
> > Also further clue, watching live tv initially "works" (no sound), but
> > changing channel locks up the frontend with warning "player: /dev/dsp:
> error
> > setting audio output device to 44100kHz/16bits/2channel"
> >
> > Any ideas please?
> >
> > _______________________________________________
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> > mythtv-users at snowman.net
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> >
>
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