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

[Steven Ihde]

The patch worked!

On Apr 2, 2012, at 6:35 PM, Jean-Yves Avenard wrote:
> On 3 April 2012 11:25, Steven Ihde <steve at x2.hamachi.us> wrote:
>> Yes, I can build from source.  I'm happy to try any suggestions you have.  I
>> was expecting to see a message about "downmixing" from 6 to 2 channels but I
>> don't see one.
> 
> if you were running mythfrontend with -v audio, you would have seen it.

Yes, I see it after enabling -v audio.

> 
> Apply the following patch and see how it works:
> diff --git a/mythtv/libs/libmyth/audiooutputbase.cpp b/mythtv/libs/libmyth/audio
> index 54e9371..3f0420a 100644
> --- a/mythtv/libs/libmyth/audiooutputbase.cpp
> +++ b/mythtv/libs/libmyth/audiooutputbase.cpp
> @@ -534,7 +534,7 @@ void AudioOutputBase::Reconfigure(const AudioSettings &orig_
>         if (enc)
>             output_format = FORMAT_S16;  // Output s16le for AC-3 encoder
>         else
> -            output_format = output_settings->BestSupportedFormat();
> +            output_format = FORMAT_S16;
>     }
> 
>     if (passthru)
> 
> 

The patch worked! Both 2 and 6 channel AC3 are playing back correctly now.  After the patch, I see the following:

2012-04-02 21:43:07.729 AO: Opening audio device 'iec958:CARD=CMI8768,DEV=0' ch 2(6) sr 48000 sf signed 16 bit reenc 0

Now it's using 16-bit instead of 32-bit.

Please let me know if I can help with further testing.

> 
>> 
>> Sorry I missed your earlier message asking for more logs; pasted a longer
>> log segment below.
> Those aren't with -v audio, so it doesn't help much

If you want a full log pre- or post-patch with -v audio let me know.

Thanks,

Steve