[mythtv-users] using AC3..

henk willems altijdweerdieautodrop at hotmail.com
Mon Nov 1 23:20:29 UTC 2004


Jarod, what did you change to that asoundrc? Or better yet, could you send 
me yours :)

>From: Jarod Wilson <jcw at wilsonet.com>
>Reply-To: Discussion about mythtv <mythtv-users at mythtv.org>
>To: Discussion about mythtv <mythtv-users at mythtv.org>
>Subject: Re: [mythtv-users] using AC3..
>Date: Mon, 1 Nov 2004 13:28:14 -0800
>
>On Monday 01 November 2004 10:25, Craig Tinson wrote:
> > Just spotted this topic in a previous reply from Jarod..
> >
> > So thought I'd take it to a new topic..
>
>Good idea, it was kinda buried in that other thread...
>
> > My setup has been running *quite* smoothly with cvs for ages now..  but
> > theres something thats bugging me.. and I know its a lack of knowledge
> > on my part thats causing it..
> >
> > I have a decent sound system in my living room.. and my myth box's sound
> > card has an s/pdif output.. and although I'm using it.. I *suspect* it
> > could sound even better...
> >
> > I presume using AC3 is the way to go.. but have absolutely *no* idea how
> > to go about it..
>
>Issue number one to output AC3 audio, is that you need a video source with 
>AC3
>audio. I believe most DVB stuff contains AC3 audio, but I don't believe
>straight PAL does. I know straight NTSC doesn't. I'm passing raw AC3 to my
>amp on HDTV streams and dvd rips, passing PCM on standard-def TV.
>
> >  From memory.. I must be using OSS Emu.. as myth is still pointing at
> > /dev/dsp..
>
>Yup.
>
> > So is there any docs on using *pure* alsa.. and ac3 output for
> > myth/alsa/fc2 ? and if not.. could some nice person (looks at Jarod cos
> > I know he's doing the same) point me in the right direction?
>
>There's a good Digital Sound Howto page on the mythtv.info site, which is 
>what
>I based my setup off of. I use Mike Dean's fully tweaked out .asoundrc for
>the nForce2 posted there, modified for use with my Audigy (I only had to
>change like five lines) and ALSA:spdif (I believe) as my output device
>instead of /dev/dsp. Despite what it says there and in the linked thread, I
>have both AC3 and PCM passing through to my amp with the "enable AC3
>passthru" option in Myth enabled, not sure if that is because of a change 
>in
>Myth or because of my .asoundrc or what...
>
>http://mythtv.info/moin.cgi/DigitalSoundHowTo
>
>--
>Jarod C. Wilson, RHCE
>jcw at wilsonet.com
>
>Got a question? Read this first...
>      http://catb.org/~esr/faqs/smart-questions.html
>MythTV, Fedora Core & ATrpms documentation:
>      http://wilsonet.com/mythtv/
>MythTV Searchable Mailing List Archive
>      http://www.gossamer-threads.com/lists/mythtv/
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