[mythtv-users] AC3 passthrough abnormality

[Charles Waddell]

>>Thanks, I did what you said and used Xine to play the recording. The same
> > problem happened, so I hooked my tv up to my receiver with optical audio 
>out
> > and it seems to be a problem with the AC3 encoded audio stream. When the 
>tv
> > passes it through to the receiver the speaker configuration is still
> > affected.
> >
> > --Daniel
> >
> >  > I recently added satelite speakers to my sound system (3.1 to 6.1). I
> > have
> >  > alsa configured for AC3 passthrough, and it works flawlessly in Xine
> > playing
> >  > DVDs. However when I have surround sound through mythtv, the speaker
> > output
> >  > is all mixed up. The most obvious mixup is that the center channel 
>audio
> >  > outputs through the left satelite, but all speakers are outputting 
>audio.
> > I
> >  > currently have /dev/adsp set as the audio output device and have 
>audio
> >  > optical output to my receiver. Here are some settings you might need 
>to
> > help
> >  > me out, I am lost on this one.
> >
> > Wait, your using AC3 passthrough and the speaker output is on the
> > wrong channels? Myth shouldn't be touching the AC3 stream if your
> > using passthrough. Have you tried playing back the Myth recordings in
> > mplayer to see if the behaviour changes?
>
>but DVD's play AC3 fine? Thats so strange that the AC3 stream your
>getting is wrong...
>
>--
>Steve

I double checked it by tuning into a program that I knew would be encoded 
for surround sound and sure enough, there appears to only be 1 channel that 
is causeing the problem. All other stations are fine (I just happened to 
record the first surround sound program from that channel), but it is 
consistent with all programs on that channel. In case anyone is interested 
it is Showtime in the Louisville Metro area.