[mythtv-users] HDMI sound works for AC3 2-channel, but not 6-channel

[Jean-Yves Avenard]

On Monday, 2 April 2012, Steven Ihde wrote:

>
> Just upgraded from mythtv 0.23.1 to 0.24.2 yesterday.  Now audio for most
> programs does not play back (it is silent).
>
> I'm using the IEC958 output on the sound card to plug into the digital
> sound input on the video card which mixes it into the HDMI stream.  The
> HDMI cable is connected to directly to my TV.  This worked fine with all
> source material before.  Now it only works with AC3 2-channel source
> material.  Whenever I see this in the mythfrontend log:
>
> 2012-04-01 21:51:07.358 AO: Opening audio device
> 'iec958:CARD=CMI8768,DEV=0' ch 2(2) sr 48000 sf signed 16 bit reenc 0
>
> The sound plays back fine.  Whenever I see this:
>
> 2012-04-01 21:51:17.267 AO: Opening audio device
> 'iec958:CARD=CMI8768,DEV=0' ch 2(6) sr 48000 sf signed 32 bit reenc 0
>
> I get silence.  Note "ch 2(2)" vs. "ch 2(6)".  The 2(2) message is
> preceded in the log by "codec AC3 has 2 channels", while the 2(6) message
> is preceded by "codec AC3 has 6 channels".  Looking back through the
> mythfrontend logs from before the upgrade, it always said "ch 2(2)", even
> when there was a 6-channel stream (and there was no mention of 16 vs 32
> bit).
>
> Anybody have an idea what could be wrong?
>
>
>
If you provided more logs rather than cutting out so much.. Then yes.. We
could probably help better.

What are your audio settings (both main audio settings and options in the
advanced screen)

If AC3 , it should never attempt to open the audio device as 32 bits.... So
my guess is that you've set options you shouldn't have.
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