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

[Igor Cicimov]

Is your mythfrontend audio set to stereo?
 On Apr 2, 2012 3:58 PM, "Steven Ihde" <steve at x2.hamachi.us> 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?
>
> I should probably mention that I also upgraded the box from Debian Etch to
> Squeeze at the same time (yes, I was a little behind the times... was
> leaving well enough alone) so the alsa lib version probably changed as well
> (kernel version is the same though, 2.6.32, since I was running a
> backported kernel with Etch).
>
> Thanks,
>
> Steve
>
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