Mailing List Archive: MythTV: Users

MythTV muting volume, but TVTime fixes it.

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kane.tse at gmail

Oct 4, 2005, 11:48 AM

Post #1 of 3 (1188 views)
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MythTV muting volume, but TVTime fixes it.

I have a Celeron D 2.93 master backend with a ATI TV Wonder PCI (attached to
the onboard motherboard soundcard) and Hauppauge WinTV GO-Plus (attached to
a SoundBlaster Live Value). Both are bt8x8 cards. I was previously running
Fedora Core 3 and MythTV 0.18.1 without any audio problems, but I needed to
reinstall the OS so I upgraded to Fedora Core 4.

I have no volume when I watch LiveTV or recordings from the ATI card. The
WinTV card works fine. I have a patch cable from the ATI's line-out to the
soundcard's line-in and headphones attached to the speaker-out of the
soundcard. I hear nothing.

The strange thing is that if I run TVTime, audio works fine. Then, if I
shut-down TVTime and immediately go into MythTV LiveTV (on a remote
frontend), I can hear the channel and switch channels no problem. But
inevitably, after exiting to the menu and going back into LiveTV, the volume
mysteriously gets muted. At that point, I plug my headphones directly into
the ATI's line-out and also now hear nothing. Start up TVTime again, and I
can hear audio.

The whole time, anything recorded/Live TV from the WinTV works fine with
audio, so I know I don't have a problem on the frontend side of things.

Is possible that something to do with the msp3400 driver in FC4 is screwing
things up?

Thanks!

kane.tse at gmail

Oct 5, 2005, 1:02 AM

Post #2 of 3 (1114 views)
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Re: MythTV muting volume, but TVTime fixes it. [In reply to]

Bad form to reply to my own message, but for anyone else who seems to
encounter this problem:
There is a program that comes with xawtv-3.xx called v4lctl where you can
manaully unmute the TV tuner card's volume control with the following
command:
v4lctl volume mute off
I just put it into a cron job to run every 5 minutes. Unforunately, it has
a habit of making the audio drop out for 0.5 sec in the recordings, so I
didn't want to run it any more frequently than that. I'm looking for a way
to run it everytime MythTV starts a new recording.

watkinshome at gmail

Oct 5, 2005, 3:17 PM

Post #3 of 3 (1116 views)
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Re: MythTV muting volume, but TVTime fixes it. [In reply to]

On 04/10/05, kanetse [at] gmail <kane.tse [at] gmail> wrote:
> I have a Celeron D 2.93 master backend with a ATI TV Wonder PCI (attached to
> the onboard motherboard soundcard) and Hauppauge WinTV GO-Plus (attached to
> a SoundBlaster Live Value). Both are bt8x8 cards. I was previously running
> Fedora Core 3 and MythTV 0.18.1 without any audio problems, but I needed to
> reinstall the OS so I upgraded to Fedora Core 4.
>
> I have no volume when I watch LiveTV or recordings from the ATI card. The
> WinTV card works fine. I have a patch cable from the ATI's line-out to the
> soundcard's line-in and headphones attached to the speaker-out of the
> soundcard. I hear nothing.
>
> The strange thing is that if I run TVTime, audio works fine. Then, if I
> shut-down TVTime and immediately go into MythTV LiveTV (on a remote
> frontend), I can hear the channel and switch channels no problem. But
> inevitably, after exiting to the menu and going back into LiveTV, the volume
> mysteriously gets muted. At that point, I plug my headphones directly into
> the ATI's line-out and also now hear nothing. Start up TVTime again, and I
> can hear audio.
>
> The whole time, anything recorded/Live TV from the WinTV works fine with
> audio, so I know I don't have a problem on the frontend side of things.
>
> Is possible that something to do with the msp3400 driver in FC4 is screwing
> things up?
>
> Thanks!
>

I just noticed that in mythtvsetup 'Capture Card' screen, there's a
tick box titled:

Do not adjust volume

that has the help comment "Check this option for budget BT878 cards ..
that require the audio volume left alone"

It doesn't seem to be checked by default, so maybe you could check if
setting it stops mythtv messing with your volume..

Just a thought.

D
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