[mythtv-users] Not getting Dolby Prologic out of s/pdif

Kevin Kuphal kuphal at dls.net
Tue Mar 21 05:50:32 UTC 2006


Gregorio Gervasio, Jr. wrote:
>>>>>> Kevin Kuphal writes:
>>>>>>             
>
> k> Perhaps you can advise me here.  I have ATSC HD recordings that if I 
> k> play them through mplayer with -ac hwac3, my receiver pops into Dolby 
> k> Digital mode (or whatever) and it works nice (2 ch, 5 ch, whatever), but 
> k> if I enable AC3 passthrough in Myth, I get no sound.  I have no 
> k> .asoundrc file and it seems that ALSA works fine for mplayer  with that 
> k> switch, what more does Myth need?  My normal recordings go fine to my 
> k> receiver via ALSA:default or ALSA:spdif, whatever I have set in Myth.
>
>
>         I have the same problem reported here:
>
> http://www.gossamer-threads.com/lists/mythtv/dev/187127#187127
>
> If I remove the code described in the post, AC3 passthrough works fine
> with "ALSA:default" as the output device.  This is with onboard audio
> on an nForce4 board, no .asoundrc, FC4.
>   
For the sake of completeness, my problem was resolved by setting Myth to 
output to ALSA:spdif instead of ALSA:default on my Turtle Beach Riviera 
with no .asoundrc file.  My HD recordings now playback with 5.1 audio as 
expected.

Kevin


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