[mythtv-users] no sound sblive alsa livetv

forforms forforms at comcast.net
Thu Dec 9 22:41:41 UTC 2004

I plugged headphones into line out jack of capture card and hear no sound 
when using mythtv livetv. I made sure I was using correct hole and made sure 
line was not muted on kmixer. I tried the same thing using xawtv and I get 
sound regardless if line is muted or not in kmix I get sound from line out 
of capture card using xawtv. I even turned off master volume and still get 
sound. I guess that's because mixer is only for sound card and not capture 
card. so if there is no sond from myth livetv and sound from xawtv does that 
mean software issue or hardware?

I plugged patch cable back in and started xawtv with line unmuted and got 
sound. Next, I muted line in using kmix and left recording line in red led 
on and did aplay /dev/dsp and still get no sound.The capture slider is 
turned up and on.

[root at pegasus root]# ls -l /dev/dsp*
lr-xr-xr-x  1 root root 9 Dec  8 13:14 /dev/dsp -> sound/dsp

 ls -l adsp*
lr-xr-xr-x  1 root root 10 Dec  8 13:14 adsp -> sound/adsp

dsp seems to be the right one

here is modprobe.conf. I added the alias as suggested. Do I have to reboot 
or is there a command I can do to reload the audio stuff?

alias autofs autofs4
alias sound-slot-0 snd-emu10k1
alias msp3400 msp3400-ivtv
options bttv radio=1 gbuffers=4
alias eth0 tulip
alias eth1 tulip
install snd-emu10k1 /sbin/modprobe --first-time --ignore-install snd-emu10k1 
&& { /sbin/modprobe snd-pcm-$
install snd-maestro3 /sbin/modprobe --first-time --ignore-install 
snd-maestro3 && { /sbin/modprobe snd-pc$
install usb-interface /sbin/modprobe usb-uhci; /sbin/modprobe ehci-hcd; 
remove snd-emu10k1 { /sbin/modprobe -r snd-pcm-oss; } ; 
/sbin/modprobe -r --first-time --ignore-remove sn$
remove snd-maestro3 { /sbin/modprobe -r snd-pcm-oss; } ; 
/sbin/modprobe -r --first-time --ignore-remove s$

I think I will try another sound card and another computer if there are no 
other suggestions?

----- Original Message ----- 
From: "Bruce Markey" <bjm at lvcm.com>
To: "Discussion about mythtv" <mythtv-users at mythtv.org>
Sent: Wednesday, December 08, 2004 7:30 PM
Subject: Re: [mythtv-users] no sound sblive alsa livetv

> Technical wrote:
> ...
>> aplay /usr/share/sounds/info.wav  works
> Which indicates the PCM is turned up so that's not the problem...
>> here is what I got:
>> Playing raw data '/dev/dsp' : Unsigned 8 bit, Rate 8000 Hz, Mono
>> underrun!!! (at least 10.579 ms long)
> ...
>> What does underrun mean?
> It means the driver is loaded =). You wouldn't see these if
> it could not access the device file and when it is working
> correctly, you will see these messages and hear sound.
> It all looks good but there isn't anything here to verify
> that there is any audio signal coming from the card. Try plugging
> headphones or speakers into the audio out from the capture card.
> One potential problems is that many cards with s-video or composite
> inputs also have an audio-in jack and may have the same size IR
> jack. Make sure you've actually plugged into the right hole. If
> there is still no sound it is either a driver problem or bad
> hardware.
> If there is sound out of the headphones then plug the patch
> cable back in. Same caution for the sound card. Make sure it
> is really the line in. If it is, you should be able to hear the
> realtime analog passthru audio when running xawtv with Line
> unmuted. Once that works, mute Line again and "aplay /dev/dsp".
> This should work unless 1) Line is not set as "CAPTUR" 2) the
> "Capture" slider is not turned up 3) /dev/dsp is not right
> because it may be /dev/dsp1 if there is another device or 4)
> your soundcard or soundcard driver is failing to do the job.
> --  bjm
> _______________________________________________
> mythtv-users mailing list
> mythtv-users at mythtv.org
> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users

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