[mythtv-users] No sound from Mythvideo when using alsa

[James Nikolich]

Hey, Paul;

Actually, I'm using straight-up 2-channel analog sound, not digital.  So far
I've been too lazy to pull apart my entertainment centre in order to get to the
wiring in behind, so I haven't snaked any new cables yet... (sigh)

But to try to answer your question:  The problem you describe seems similar to
what I saw a lot of other people also reporting.  From what I gather it is not
caused by MythTV/MythVideo, nor mplayer... nor even ALSA, I think.  Rather it's
some goofiness in the chipset itself.

Try reading through this thread -- it might provide some helpful advice: 
http://www.alsa-project.org/alsa-doc/doc-php/notes-full.php3 .

Let me know if it helps!

Jim

--
My software never has bugs. It just develops random features.



Quoting Paul:

> Hi Jim,
>
> I have an Abit IS7 and I'm also using the onboard sound. I was wondering if
> you had had any luck getting mythvideo or mythdvd to pass 6 channels through
> the SP/DIF.
>
> I'm no expert in linux and sound, but following advice I have tried this:
>
> mplayer
>   -fs -zoom
>   -ao alsa9:iec958
>   -aop list=resample:fout=48000
>   -af resample=48000
>   -ac hwac3,
>   -vo xv
>   %s
>
> I get no sound out though, but iof I stick to the  default setting it works
> fine, but only in stereo.
>
> Thanks in advance,
>
> Paul
>
> > I had similar problems with my intel8x0-based nForce-2 sound setup (I have
> an
> > MSI K7N2G-ILSR mobo).  I tried various combinations of "-ao alsa9", "-ao
> > alsa9:intel8x0", "-ao alsa9:hw:0,0"... all to no avail.
> >
> > I found that running "mplayer -ao help" gave a list of supported audio
> output
> > drivers, and lo-and-behold! - there was no "alsa9" output listed.  There
> WAS an
> > "alsa1x" (that's with the number 1, not a lowercase "L"...) listed, though;
> > hmmm...
> >
> > I tried "-ao alsa1x" and it worked for me.  I guess the mplayer people have
> > changed their config options to better reflect the fact that ALSA is
> getting
> > closer to releasing their "1.0" version.
> >
> > In the end, I removed the "-ao" option completely from my MythVideo setup,
> and
> > instead placed the line "ao=alsa1x" in my "/etc/mplayer/mplayer.conf"
> config
> > file, to make mplayer use ALSA however it is called.
> >
> > The resulting mplayer output looked like:
> >
> > -----------------OUTPUT BELOW-----------------
> > Checking audio filter chain for 44100Hz/2ch/16bit -> 44100Hz/2ch/16bit...
> > AF_pre: af format: 2 bps, 2 ch, 44100 hz, little endian signed int
> > AF_pre: 44100Hz 2ch Signed 16-bit (Little-Endian)
> > alsa-init: requested format: 44100 Hz, 2 channels, Signed 16-bit
> (Little-Endian)
> > alsa-init: 1 soundcard found, using: hw:0,0
> > alsa1x: 48000 Hz/2 channels/4 bpf/65536 bytes buffer/Signed 16 bit Little
> Endian
> > AO: [alsa1x] 48000Hz 2ch Signed 16-bit (Little-Endian) (2 bps)
> > Building audio filter chain for 44100Hz/2ch/16bit -> 48000Hz/2ch/16bit...
> > Starting playback...
> > -----------------OUTPUT  ENDS-----------------
> >
> >
> > I hope this helps, Romel.  Drop me a line to let me know!
> >
> >
> > Jim
> >
> > --
> > Mountain Dew and doughnuts... because breakfast is the most important meal
> of
> > the day.
> >
> >
> >
> >
> > Quoting Romel Llarena <rdllarena at yahoo.com>:
> >
> > > I couldn't get the sound to sync right in Mythvideo,
> > > so I decided to give alsa a shot. After reviewing
> > > Jarod's documentation, I tried the following command
> > > line using alsa9. Now, I have no sound. BTW, I'm
> > > running a Chaintech mb w/audigy2 PCI card. SPDIF
> > > output.
> > >
> > > /usr/bin/mplayer -fs -zoom -quiet -monitoraspect 4:3
> > > -vo xv -ao alsa9 %s
> > >
> > > Next, I read in another thread to add additonal
> > > information after alsa.
> > >
> > > /usr/bin/mplayer -fs -zoom -quiet -monitoraspect 4:3
> > > -vo xv -ao alsa9:emu10k1 %s
> > >
> > > Still no sound. Any suggestions?
> > >
> > > Also, out of curiosity, considering my hardwared
> > > config. should my sound in MythTV set to /dev/mixer or
> > > /dev/dsp?
> > >
> > > Thanks!
> > >
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