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

[HP-mini]

On Wed, 2013-06-12 at 21:51 +0800, Phil Wild wrote:
> 
> 
> 
> On 12 June 2013 21:36, Phil Wild <phil at holobyte.com.au> wrote:
>         

>                 > The reason I started fiddling is that recently, I
>                 seem to get a lot of
>                 > crackling through the rear speakers (most
>                 prominently left-rear), only
>                 > through mythtv. I first thought it was the speaker
>                 or amp, but everything
>                 > sounds perfect with other sources. I then put it
>                 down to a bad rip but it is
>                 > evident in lots of files. I did not notice any of
>                 this prior to my upgrade
>                 > to 0.26. So I thought I would play with the audio
>                 settings and then noticed
>                 > this issue.
>                 
>                 
>                 what were your settings previously?

<snip>
>         I did some more testing tonight. bluray track via bluray
>         player, very loud and no issues. The track I was playing
>         through mythtv that sounds terrible, I played through my Roku3
>         and Plex and it sounds perfect.
>         I am going to switch the hdmi inputs on the back of the
>         receiver to confirm that it is not the receiver input. I'm
>         also going to load VLC onto my frontend and play the file
>         through it to see if it is OS related rather than mythtv.


> Just confirmed this is not a mythtv issue. I get the same poor sound
> quality through vlc so it is not related to my upgrade from 0.25 to
> 0.26. At the same time, I upgrade the OS (apt-get update;apt-get
> upgrade) so perhaps it was introduced there...
> It still could be the input on the receiver. Pulling the receiver out
> to switch the inputs is a pain.
> 
That could be because VLC is defaulting to same audio output format as
mythtv.
> 
Does this work okay ?
Set mythtv to use stereo PCM (no upmix) & tick AC3 & DTS (digital
capabilities) you'll avoid the discrete multi-channel PCM ordering
problem & this lets the ht-amp do all decoding.