[mythtv-users] How can I determine proper audio settings

Mark J. Bobak mark at bobak.net
Wed Apr 18 07:30:13 UTC 2007


What is the sound card outputting to, and how is it connected?

On my system, I'm using an optical SPDIF connection to my audio system's
preamp.  So, I use ALSA:iec958 (or ALSA:spdif, which is an alias) for
Audio output device, and the same for Passthrough output device.  I have
the mixer device disabled, cause w/ a digital optical link, I don't do
volume control in Myth, I do it on my system's preamp.

Hope that helps,

On Wed, 2007-04-18 at 16:24 +0900, Dave M G wrote:
> MythTV Users,
> In the mythfrontend->setup->general->audio, I have:
> 4 possible settings for "Audio output device". (ALSA:default, /dev/dsp/, 
> /dev/dsp1, /dev/adsp)
> 2 possible settings for "Passthrough output device". (Default, 
> ALSA:iec958:[AES0 0x02})
> 3 possible settings for "Mixer Device". (default, /dev/mixer/, /dev/mixer1)
> 2 possible settings for "Mixer Controls". (PCM, Master)
> ... and 5 check boxes for various controls.
> My high school math escapes me at the moment, but I think there are a 
> couple dozen possible combinations. I've tried experimenting a bit, but 
> I'm not sure I'm up to the task of charting all possible combinations 
> and working out which will actually make my sound work.
> My sound, by the way, doesn't work right now. By which I mean, it works 
> outside of MythTV, but not within it.
> There must be a way of first determining what my system is, and then 
> using that to select the correct combination of audio controls. Or at 
> least narrow them down.
> Is there a way I can do this?
> Thanks for any advice or information.

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