[mythtv] Fwd: Re: [mythtv-users] AC3 Decoding without external hardware?

[Jim Torelli]

Hey guys!

How's it goin?  Hey, this was a question I posed yesterday on the Users list, 
but I think it's turned more into a development question at this point so I 
moved it to this list..  Basically, I'm trying to figure out how to enable 
multichannel audio playback without exporting over S/PDIF. 

While dinking around in the code, I found a couple places where the maximum 
number of channels was hardcoded to 2.. When I reset this to 6 and setup my 
audio device to ALSA:default, I started getting all 6 channels of audio, but 
they were all coming out of wrong speakers (IE: center came through right 
rear) when playing a 5.1 stream. When playing a stereo stream with the max 
channels boosted to 6, everything seems to play correctly..

So, just a couple quick questions:
1)  Is there any particular reason why the max number of output channels are 
currently hardcoded to 2?  Would changing this break something somewhere else 
to change it?
2) Does anyone have any ideas as to why all 6 channels of audio would be 
decoding but routing to the wrong speakers?  I'm sure it's not my ALSA 
configuration because when I play multichannel audio streams from other apps 
everything goes to the correct speakers..

Thanks and have a good one!!!
jim


----------  Forwarded Message  ----------

Subject: Re: [mythtv-users] AC3 Decoding without external hardware?
Date: Thursday 06 April 2006 12:42
From: Isaac Richards <ijr at case.edu>
To: Discussion about mythtv <mythtv-users at mythtv.org>

On Thursday 06 April 2006 13:38, Jim Torelli wrote:
> Hey Isaac!
>
> How's it goin?  So, my real issue is that when I turn S/PDIF passthrough
> off, everything is recorded with only 2 channels in the NUV file (when
> played back through MPlayer or anything else).. When I turn it AC3 to
> S/PDIF on, all 6 channels are recorded to the NUV file, but obviously the
> audio stream is just clicks (the digital stream being played through the
> analog output), however when I play this NUV under MPlayer I get full 5.1
> sound.
>
> So I guess  I should refine my question to: Is there any way to get MythTV
> to record all 6 channels of audio to the NUV, then play them back correctly
> in all 6 channels without using any external S/PDIF output, like MPlayer
> does..

That setting has absolutely no effect on what is recorded.  It is _only_ used
for playback.

Isaac
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