[mythtv-users] No Sound, MythTV 20.2, Fedora 8, bt878 caputre card

[Trevor Hartman]

Hi Again everyone,

I ended up finding a solution to my own problem.  For some reason my MythTV
install was muting my video 4 linux device.  I still don't know why that was
happening, but the following procedure fixed the problem for me.

Once I start the mythfrontend, I Alt+Tabbed to my open shell and ran:
"v4lctl volume mute off" without the quotes, of course.

This gave me my much desired sound.  The sound was terrible though until I
muted the CD line on my mixer to get rid of the echo, and increased the
sample rate in the MythTV "Recording Profile" to clear up the reverb.

I also notice, now that I have sound, my setup sounds much better with the
mythfrontend device set as ALSA:default instead of /dev/dsp, again as
expected.

Cheers,
Trevor



---------- Forwarded message ----------
From: Trevor Hartman <viable.hartman at gmail.com>
Date: Dec 14, 2007 4:02 PM
Subject: No Sound, MythTV 20.2, Fedora 8, bt878 caputre card
To: mythtv-users at mythtv.org


Hi All,



I have a Dvico Fusion HDTV 5 Lite tuner card (Chipset bt878) and have
installed MythTV 20.2 on a Fedora 8 box.  Ever since I went to Fedora 8, I
can't get audio from the analog portion of this card.  HD audio works fine,
of course, because of the audio encoded in the mpeg2 stream itself, but
analog capture just doesn't work in Myth.



My card has an audio line out plugged into the CD input port of my
motherboard's onboard sound card.  If I use xawtv or tvtime to watch tv from
this card, I get both picture and audio, but in Myth I just get picture.
Mind you, I had this same hardware and an earlier version of Myth working
fine on Fedora 6.



I know that Fedora 8 uses the new Pulseaudio system, but I don't believe
that is where the problem resides, as I have removed the ALSA plugin for
pulseaudio and tried several other things with the ALSA mixer.



My ALSA mixer setup is as follows: CD capture is set to capture and CD
playback is set to 100% volume.  I've also played around a bit with the
AC-97 settings as several forums sites suggested this, but to no avail.



Currently I'm just trying to get the default Myth settings to work for me (
i.e. make sound come from /dev/dsp).



In mythtvsetup my analog card device is set to /dev/dsp and in the
mythfrontend setup the device is also /dev/dsp although I've tried
ALSA:default as well.  Neither setup works.



To make things even more confusing the following procedure works:

   1. Turn on xawtv or tvtime
   2. Mute the CD playback line
   3. aplay /dev/dsp



I do get slightly off sound as one would expect using this method.  My
understanding is that if this works, then MythTV sound should also work, but
it doesn't.



Can anyone please help?  This one is driving me crazy?



Thanks,

Trevor
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