[mythtv-users] ALSA/surround and mythtv

[Ed Rubright - mail lists]

Rodney Fluharty wrote:
> "ALSA:surround51" gives me nothing.  "ALSA:surround51:0" and 
> "ALSA:plug:surround51:0" all fail.  "ALSA:default" is the only thing 
> that works, but then just for 2 channels.
> Jeremy Hunt wrote:
>   
>> On 11/15/06, Rodney Fluharty <rfluharty at 321online.net> wrote:
>>   
>>     
>>> Hi,
>>> I'm running myth 0.20-0.4, with ALSA 1.0.11-5 on a sis7012? (ac97).  I
>>> can use "plug:surround51" as a device in xine and 5.1 works fine.  So I
>>> think ALSA is okay.
>>>
>>> In mythtv, I enter my device as "ALSA:plug:surround51:0" and mixer as
>>> "default", as I read on a website and I get nothing!  "ALSA:default"
>>> works, but only as a stereo output (no 5.1, no surround).
>>>
>>>     
>>>       
>> Just try "ALSA:surround51". Works for me. I am using
>> "ALSA:plug:default" or something for Mythmusic.
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>>     
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>   
I'm running into a similar issue with the same sound device in my 
upgrade to FC6(alsa-lib-1.0.13) and myth .20-140, that has me scratchin' 
my head.

I have the same sound device SIS7012 on my Shuttle.  I'm using SPDIF out 
to my Denon receiver, so I want all audio to go thru the SPDIF.

I do not have a customized .asoundrc and I've configured myth:

Audio output device: ALSA:iec958
Passthrough output device: ALSA:iec958
Enable AC3 to SPDIF passthrough:  checked
Enable DTS to SPDIF passthrough: checked
Aggressive Sound card Buffering:  unchecked
Use internal volume controls:  unchecked



With this I'm able to get AC3 into the Denon with the correct sound when 
the source has AC3( LiveTV from HD(thru Firewire), MythDVD, MythVideo 
when files are AC3.

I'm able to get sound in MythVideo when the AVI files are encoded with 
MP3 at 48000 Hz.


The problem:  I'm not able to get any sound at all when the source is at 
44100 Hz.  No sound from MythVideo when AVI files are MP3 encoded at 
41000 Hz.  No sound from MythMusic at all!

It appears the issue is the 41000 Hz content going into the 
SPDIF...perhaps it needs to be converted to 48000 on the fly....but I 
don't know what I need to do to configure that?


Thanks in advance,
Ed