[mythtv] [mythtv-commits] Ticket #1104: multi channel audio support

Mark Spieth mark at dclabs.com.au
Thu Oct 11 23:02:05 UTC 2007

> In the mean time I've tried setting the database field to the
> "ALSA:softvol|surround51m" value and although my upmixed audio works as
> usual, trying a DVD with the internal player appears to use 'softvol'
> rather than the 5.1 PCM...
> That's what it 'sounds' like in any case, and I'm guessing that the
> 'channels=2' in the setparameters line at the bottom of the following log
> confirms that?
> 2007-10-07 23:25:01.247 AFD: Warning, video codec 0x877fdb0 id(MPEG2VIDEO)
> type (Video) already open.
> 2007-10-07 23:25:01.708 AFD: Setting maxchannels to 2, -1

this is probably your problem. you havent selected 6 ch mode in setup I 
suspect. If you dont select that, you wont get 6ch output.
Then if the audio stream is 6 channel it will use the 2nd of the devices, 
otherwise it will use the first device.
If maxchannels is 2 as in your case then it will downmix the 6ch to 2 ch in 
the ac3 or dts decoder and present only 2ch audio to the audiooutput 


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