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

Mark Anderson markjanderson at mail.com
Mon Feb 14 21:18:50 UTC 2005


Dohh I was a little bit late. Must be my processor not keeping up then.

On Tuesday 15 February 2005 08:09, Blammo [doh] wrote:
> 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
> > > _______________________________________________
> > > mythtv-dev mailing list
> > > mythtv-dev at mythtv.org
> > > http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-dev


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