[mythtv-users] Asus Pundit Audio Problems

[Henk Poley]

Op woensdag 14 april 2004 04:45, schreef Dave Stocker:
> Tried a couple different things to try and resolve this. First I was
> going over the settings in my kernel and realized I didn't have the real
> time clock option enabled for ALSA. With this option on the audio gets
> louder but is still filled with static. This is when using the audio
> cable hooked from the TV card to the soundcard.
>
> Next I thought I would try telling the card to create its' own sound
> devices (I am assuming that is what was meant by "digital loopback" in
> the comments below). So I pass in the following options for the module:
> oss=1 oss_debug=1 audio_debug=1
> (Also tried passing in oss_rate=32000 as I was reading that this is the
> rate you need for this card but it made no differencef).
> I assume that you need to change the audio device setting under
> mythsetup to be the new device created (in this case dsp1) but keep the
> audio out device under mythfrontend to be the same as it was (dsp).
> With all this setup I get absolutely no audio from live tv. (not even
> interference). This is checking from both the SPDIF outs and the regular
> line outs. I get the following messages back from the saa7134 module
> when I start the live tv but not sure if there is anything of use:

This is a known problem with MythTV, it doesn't support v4l2. Therefor it uses 
the v4l-compatibility layer of v4l2. So the built-in audio of v4l2 is 
sometimes a bit screwy when used with Myth.

How I solved it, use v4lctl to set the volume at 70% (or so) and unmute it. 
you need to unmute the volume every time at boot-up. AFAIK like this:
$ v4lctl volume 70%
$ v4lctl volume unmute

You should know that the device will mute the audio a soon as soon as you tune 
a bad frequency (no carrier signal). Yes, this can be annoying.

v4lctl is inlcuded in the xawtv packages on most distro's, be sure not to 
unstall it (like I did once, aka recordings with no sound...). btw, I was 
unaware that the saa7133 also had the built-in audio digitizer.

If nothing helps, you could also try asking your question on the v4l 
mailinglist.

	Henk Poley <><