[mythtv] [mythtv-commits] Ticket #1104: multichannelaudio support

[Robin Gilks]

>>
>> Sorry Mark - still confused...
>>
>> Are you saying that if my only connection is S/PDIF from my frontend to
>> my
>> amp then it will only reencode if I change playback speed? Otherwise I
>> have to use 6 analog connections?
>>
>> Example
>> Standard def DVB-S recording with stereo sound. I have ALSA:Default as
>> the
>> output device for S/PDIF output to the amp. No analog connections at
>> all.
>> The amp analyses the stream as PCM48.
>>
>> If I select 5.1 in setup, the digital stream to the amp is always
>> displayed as PCM48 stereo. It does not encode it to AC3. Will it become
>> 5.1 if I change the playback speed?
>
> I assume you have passthru enabled as you should have.
> leave #channels set to stereo (2ch). you dont need 6ch mode at all.
> any AC3 5.1 or DTS5.1 source material audio will be passed through as
> digital via spidf.
> any 2ch source material audio is passed via spidf as 2ch PCM48 and your
> amp
> does the upmixing.
>
> reencoding only occurs if the source material is 6ch and you have passthru
> enabled and timestretch != 1.0
> In this case it still appears via spidf as AC3 encoded 5.1 to your amp.
>
> hope this is clear.

It is a lot better thanks Mark but not 100% :-(

So this ticket is not a substitute for the upmixing my amp is capable of -
I missed that entirely (in fact I thought that is what is was!), I have to
change modes on the amp if I throw 5.1 (eg. from a DVD) at it rather than
have MythTV do it all.

I thought that it would output 5.1 irrespective of the source so I could
put yet another remote into a drawer. Not to worry - I can live with a few
button presses...

Cheers

-- 
Robin Gilks