[mythtv-users] Audio wierdness: AC-3 upconvert. Do I have a problem?

[Jean-Yves Avenard]

Hi

On 12 June 2013 00:58, Phil Wild <phil at holobyte.com.au> wrote:
> Hi Mythtv users,
>
> I tried something tonight just out of interest. I went into the audio setup
> and selected the AC-3 upconvert option. My frontend is connected to a Denon
> receiver via HDMI.

no such thing as AC3 upconvert :) there's 5.0 upconvert.

>
> When I did this and went through the test, all the speakers were configured
> wrong (e.g. front centre was surround left etc. I thought maybe it was just
> the test was wrong so I put on a movie with stereo/pro-logic audio and sure
> enough, it was now wrong.
>
> Do I have a problem somewhere? Where do I look to fix this?

What's your video card? a nvidia 9400 or something of that series?
They have a hardware bug with channels being incorrectly ordered.

Of course there's the obvious possibilities that your amp is wired wrong...

There are two way you can fix it otherwise:
- Create an alsa .alsarc that remap your channels differently
- Force to output AC3, go into the Audio -> Advanced screen, and check StereoPCM

All myth will output is 5.1 AC3 digital... this is not a lossless conversion