[mythtv-users] How to get 5.1 dts spdif out from ac3 sources?

Bill Williamson bill at bbqninja.com
Tue Jun 2 06:19:30 UTC 2009


On Tue, Jun 2, 2009 at 4:13 PM, Allen Edwards <allen.p.edwards at gmail.com>wrote:

> On Mon, Jun 1, 2009 at 9:21 PM, Michael T. Dean <mtdean at thirdcontact.com>
> wrote:
> > On 06/01/2009 11:10 PM, Allen Edwards wrote:
> >>
> >> On Mon, Jun 1, 2009 at 7:33 PM, Richard Shaw wrote:
> >>
> >>>
> >>> On Mon, Jun 1, 2009 at 2:48 PM, Harry Coin wrote:
> >>>
> >>>>
> >>>> My second mistake was setting the 'maximum channels' to 5.1.   The
> >>>> correct
> >>>> choice for multichannel digital output is 'stereo'.  Why that is
> correct
> >>>> when I actually want and have 5.1 output is confusing.
> >>>
> >>> I'll do my best to answer this part from previous posts I've read. I
> >>> think
> >>> this only applies to analog out channels. When using digital audio, you
> >>> only
> >>> ever have 2 real channels, it's just that the format (AC3 or DTS)
> >>> multiplexes the audio into 5.1 (6) or 6.1 (7) channels. I agree it's
> >>> confusing on the surface and I'm not sure that expecting the average
> user
> >>> to
> >>> understand this is a good idea. I haven't messed with it lately but I
> >>> know
> >>> that there is often additional info on the bottom of the setup screens.
> I
> >>> wonder if something to this affect could be added to clairify. I
> suppose
> >>> another option would be to add the logic to Myth to have it make the
> >>> right
> >>> choice anyway since it must be set to 2 channels for digital audio.
> >>>
> >>
> >> The 5.1 option is broken and should never be selected.  Read my wiki.
> >
> > Better stated, the 5.1 option is meant for /analog/ output *only* as
> S/PDIF
> > is inherently 2-channel (or non-audio) and has no support for 5.1
> channels
> > (AC-3 and DTS are non-audio data, so channels don't apply).
> >
> > Richard's answer is correct.
> >
> > Mike
> > _______________________________________________
> > mythtv-users mailing list
> > mythtv-users at mythtv.org
> > http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
> >
>
> I know I read in the documentation that this was a feature that was
> added but the code didn't work and everyone should just set it for
> Stereo.  I can't, however, find a reference that states that to share.
>  Do you have a reference that says it works?  I will change my wiki
> once I see the details.
>
>
It did work for a very short time.
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