[mythtv-users] Not unmuting tv tuner card???

Donald R. Huettl drh at huettl.net
Wed Dec 1 02:42:37 UTC 2004

On Tuesday 30 November 2004 05:20 pm, Michael L. wrote:
> I have a Mercury/LifeView FlyVIDEO2000 capture card using the saa7134
> chipset.  I'm having a problem getting MythTV to get sound from the card.
> It works fine using xawtv, and muting line in and running 'aplay /dev/dsp'
> with xawtv gives expected results.  However when using mythtv there is no
> sound during live tv, or playback of recordings.  I've even tried plugging
> speakers directly into capture card audio out, and no sound!  If I then
> start xawtv while mythtv is playing live tv, it will enable sound in sync
> with the video in xawtv.  If I plug speakers into sound card out (with
> sound patched in from tuner card of course), and try the same thing, there
> is a delay before the sound starts...which makes sence, because it starts
> immidately from line out from the capture card, runs into line in the sound
> card, and is then synced with the playing video in myth.  However the video
> goes away in myth as xawtv is running (as expected), and once I close
> xawtv, I get sound synced with video in myth, but after the 'recorded live
> tv' delay runs out (5 secs or so), the sound is gone again.  It's like myth
> mutes the sound coming out of the capture card.  Another interesting thing
> is that my audio is not adjustable from within xawtv, infact I don't think
> the audio on the capture card is adjustable at all, as the only way I've
> found to adjust the sound out volume from the capture card, is the physical
> volume controll knoby on the speakers.  Can anyone point me in the right
> direction to solve this problem?
> Thanks,
> Mike

Try "v4lctl volume mute off".  xawtv does this automatically at startup and 
the inverse when it shuts down.

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