[mythtv] [mythtv-commits] Ticket #1104: multi channelaudiosupport

John P Poet jppoet at gmail.com
Sun Feb 17 22:54:10 UTC 2008

On Feb 17, 2008 3:29 PM, Mark Spieth <mark at digivation.com.au> wrote:
> >Please educate me on what problem this "multi channel audio support"
> >is trying to solve.
> >
> >I have a very good surround sound preamp driving a 7.2 channel speaker
> >setup.  My preamp can decode any surround sound format other than the
> >new HD audio on Bluray or HD-DVD.  It does a very good job at routing
> >the appropriate sounds to the appropriate speakers.  When fed a Dolby
> >Digital 2.0 signal, it's ProLogic IIx decoder does an excellent job of
> >filling all 7.2 speakers with the appropriate audio cues.  When fed a
> >two channel stereo signal, it has a very good "music" mode which does
> >an excellent job at divvying up the sound amongst all seven speakers.
> >
> >How does this "multi channel audio support" improve my situation?
> what its suppposed to do is do timestretch as 6ch and then reencode
> AC3 so you should always have AC3 digital feed at your amp.
> naturally I cant test this myself but I thought it worked ok.
> thus no need to disable timestretch as everything is still 6ch.

Okay, but why re-encode something which is 6 channels (5.1) to start
with?  Doesn't re-encoding have the possibility of introducing errors
in the digital audio stream?

Is this new "multi channel" support able to preserve the *original*
steering of the audio to the 6 speakers?  If so that is really cool.
If not, how is it better at choosing which speakers to send a sound
to, than my preamp's Dolby Digital PLIIx processing?

> If it doesnt do this, please provide a log with audio and playback on and
> Ill see.

I can do that.

A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?

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