[mythtv-users] Live audio broken

Brian LeFevre blefevre at ida.net
Mon Mar 22 10:20:12 EST 2004


Slim Van de Lijn wrote:

>Problem: When watching live tv, the first few
>milliseconds of sound get played over and over,
>getting louder each time. 
>  
>
The input for your sound is not muted.  It will record if it is even 
muted.  That is why you hear it while it is recording and while it 
echos.  Run alsamixer and make sure the line-in or or whatever is the 
capture setting muted.

>Also, when recording, the live audio comes out the
>speakers even when mythfrontend is not running. 
>Audio is recorded ok when not in live-tv, although
>other sounds my speakers play also get recorded along
>with the audio.
>Video is fine. 
>
>Mythtv was working perfectly until...
>
>I upgraded my suse 9 kernal from 2.4.21-166 to -199
>and also kde from 3.0 to 3.2 (that really shouldn't
>affect anything since I don't use artsd, but who
>knows).
>
>Following the advice in the documentation, I ran
>xawtv and then aplay /dev/dsp. I have the same audio
>problem, except aplay graciously informs me there is
>an underrun!!! error.
>
>According to google, no one has had this problem.
>
>So, anyone know what's going on? I'm assuming an
>alsa bug but honestly I don't really understand
>when/how sound gets piped to /dev/dsp.
>
>Your help would be appreciated.
>
>
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>  
>
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