[mythtv-users] 7.1 channel audio

Al McIntosh junkmail at allanmcintosh.com
Sat Mar 10 16:42:37 UTC 2007

Michael T. Dean wrote:
> On 03/10/2007 10:58 AM, Al McIntosh wrote:
>> Michael T. Dean wrote:
>>> On 03/09/2007 11:13 PM, Al McIntosh wrote:
>>>>     I have a Sound Blaster Live! card connected to 7.1 amp via optical 
>>>> coax cable. When I watch DVDs or anything with xine I get nice, rich 
>>>> full surround sound. However, when I watch recorded shows within mythtv 
>>>> there is no output from LS or RS. The front , center and rear channels 
>>>> all output.   Is this a shortcoming of my current version 
>>>> *mythtv-0.20-153.fc6.at*? With the below .asoundrc I set playback to 
>>>> ALSA:default.  Any ideas?
>>> See the thread:
>>> http://www.gossamer-threads.com/lists/mythtv/users/134449#134449
>>> and especially:
>>> http://www.gossamer-threads.com/lists/mythtv/users/134552#134552
>> From what I understand, these threads all suggest configuring ALSA to 
>> duplicate front channel sounds for output to the unused channels. IE: my 
>> LS and RS channels.
>> I will still be missing the actual sounds that are intended for LS and 
>> RS channels.
> Show me a source you're getting with 7.1 channels (other than 
> DVD's--which you've said you have working), and I'll mention the other 
> possible approach (#1104).

Okay, my AMP can up convert a 5.1 to 7.1, which typically works. IE: 
when I watch a TV show on TV with my Satalite receiver connected to my 
AMP via RCA cables, I receive 7.1 channels of audio. If I playback the 
same show recorded in myth, my LS and RS are as I have mentioned unused. 
So you're saying I have 2 choices, use ALSA to duplicate channels for 
playback or compile an #1104  patched version of Myth?  So the 1104 does 
that also duplicate channels?


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