[mythtv-users] ALSA Sound and Video Modes

Michael Ford mford2 at comcast.net
Sun Jul 31 22:34:16 EDT 2005


Do you have 'IEC958 Output' turned on in Alsamixer?

Mike Ford

On Sunday 31 July 2005 8:21 pm, Brandon Rogers wrote:
> If this helps on the sound question, if I switch over to the standard audio
> out jack, then I get sound as well.  Seems like the sound is being routed
> correctly over the SPDIF
>
> Thanks,
> Brandon
>
> -----Original Message-----
> From: mythtv-users-bounces at mythtv.org
> [mailto:mythtv-users-bounces at mythtv.org] On Behalf Of Brandon Rogers
> Sent: Sunday, July 31, 2005 7:16 PM
> To: 'Discussion about mythtv'
> Subject: RE: [mythtv-users] ALSA Sound and Video Modes
>
> Thanks everyone who replied on this and helped out.  The sound is still not
> working, but holding my finger next to the optical out on the back of the
> card shows light, so I suppose that it is working from the point of view of
> my computer, anyway.  My surround sound receiver isn't recognizing the
> signal unfortunately.  I guess the only three possible problems is that the
> sound is being encoded in a way that the receiver doesn't understand, the
> light isn't actually carrying any sound and I still have a configuration
> problem, or the receiver has a broken optical in (which has never been used
> before, so who knows...).  I think (hope) it is probably the second or
> first one, but I'll keep playing with it.  If you have ANY suggestions, I'm
> pleased to receive them.
>
> Also, at first, I thought the clarity of the 1080i (540p in some cases) is
> actually better than the NTSC output.  However, after playing with things,
> I'm not sure this is the case.  Most of the clarity seems to come from
> simply having such a low resolution (the text is huge).  Sure, there is
> *some* clarity enhancements, but seeing as the resolution is so low, I
> wonder if it is really worth it.  I can crank my resolution up, modulate it
> to NTSC, and I get more screen real estate, the picture quality (for an
> average video user) are very close (admittedly, the 1080i/540p is better),
> but by how much and is it really worth it?  What does everyone think?
>
> Thanks,
> Brandon
>
> PS. I am piping the video to an HDTV over DVI->HDMI.
>
> -----Original Message-----
> From: mythtv-users-bounces at mythtv.org
> [mailto:mythtv-users-bounces at mythtv.org] On Behalf Of Michael Ford
> Sent: Sunday, July 31, 2005 5:57 PM
> To: Discussion about mythtv
> Subject: Re: [mythtv-users] ALSA Sound
>
> Create a .asoundrc file with the following and place it into the home
> directory of the myth user.   Then use ALSA:default or ALSA:spdif in Mythtv
> and Mythmusic.  Also, make sure you turn off "Multi Track Rate Locking" if
> enabled or you will get sound output at the wrong speed.  This will
> effectively output all sound through your optical out so your
> receiver/processor can do all the work.
>
> pcm.!default {
>     type plug
>     slave.pcm "cards.pcm.iec958"
> }
>
> pcm.!spdif {
>     type plug
>     slave.pcm "cards.pcm.iec958"
> }
>
> pcm.!iec958 {
>     type plug
>     slave {
>     pcm "hw:0,1"
>     format S32_LE
>     }
> }
>
> Mike Ford
>
> On Sunday 31 July 2005 1:41 pm, Brandon Rogers wrote:
> > All,
> >
> >             I know this has probably been talked about before, but since
> > after 2 days of searching Google and trying "solutions" others have
>
> posted,
>
> > I will come back and ask a question (which has probably already been
> > asked 1000 times).  I have the Chaintech AV710 soundcard which seems like
> > a popular card due to its price/performance.  How do I get this card's
> > optical out to work with my Surround Sound Amplifier?  Does it output 5.1
> > Surround? If so, what do I need to do to get it to work?  I've read the
> > MythTV Fedora HowTO and the links off that page in attempt to get the
>
> sound
>
> > to work.  I've replaced a zillion alsa sound files, but still doesn't
>
> work.
>
> >  If I route the sound to PCM out, I can hear it off the Line Out port.
> >
> >
> >
> > Thanks for your help!
> >
> > Brandon
>
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