[mythtv] Air2PC / DVB audio playback fails in Mythtv - AC3 handling problem?

[Blammo [doh]]

Ok, ran home for lunch.

AC-3 Passthrough off - I have WORKING audio on the analog ports. Myth plays the 
AC-3 Passthrough on, change to /dev/dsp - I have audio via SPDIF on my amp.


So the problem was trying to push digital out an analog port, which
isn't myth's fault, but mine. And I'm not even sure myth could be made
aware it was failing..

Now if we could just get XvMC and Myth 0.17 happy, almost all my
problems would be gone... for now.

Thanks all for your help. Consider this issue closed.


On Mon, 14 Feb 2005 11:22:48 -0700, Blammo [doh] <blammo.doh at gmail.com> wrote:
> That's odd.
> 
> ahhh.. wait.. I think I got it... can't test this yet, but I have a theory:
> 
> MythTV is set up for output to /dev/adsp, which is the ANALOG outputs
> of my sound card, IE directly to the TV. MythVideo is setup up for
> /dev/dsp, which is the DIGITAL outputs of my sound card. In the past,
> this has made complete sense, since no TV was digital, and all movies
> were.
> 
> However, in this case, you can't send AC-3 out an analog port. so that
> may be why we're hearing the chiff-chiff.
> 
> Which now brings up several question:
> 
> If I turn off AC-3 passthrough, will it play back correctly, IE convert it?
> Is there any way to choose a different output device, only for AC-3?
> IE, use /dev/adsp for normal output, use /dev/dsp for AC-3.
> 
> It's somewhat important, at least in my case, to keep the MythTV audio
> going out the analogs, in that it gives volume control to Myth. As
> soon as I sent the audio out the digital, I lose volume control. I've
> played with all the mixer settings, and nothing seems to affect that.
> Other people use the frontend way more than I do, they have a hard
> time working multiple remotes.
> 
> Thoughts?
> 
> Thanks Isaac for your help with this. I hope it turns out being this easy..
> 
> 
> On Mon, 14 Feb 2005 12:45:51 -0500, Isaac Richards <ijr at case.edu> wrote:
> > On Monday 14 February 2005 11:38 am, Blammo [doh] wrote:
> > > Small is somewhat of a misnomer when it comes to DVB files, but here
> > > is a short clip. I was on live, hit record, waited a few seconds, and
> > > stopped the recording:
> > >
> > > http://216.27.229.222/tmp/air2pc.sample.nuv.gz
> > >
> > > Apologies, it is 30M, even GZ'd.
> >
> > Plays fine here in myth.
> >
> > Isaac
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> >
>