[mythtv-users] watching recording : sound but no voice

[Allen Edwards]

2009/11/15 Guillaume Membré <guillaume.ml at gmail.com>:
> On Sun, Nov 15, 2009 at 5:15 PM, Allen Edwards
> <allen.p.edwards at gmail.com> wrote:
>> 2009/11/15 Guillaume Membré <guillaume.ml at gmail.com>
>>>
>>> 2009/11/14 Guillaume Membré <guillaume.ml at gmail.com>:
>>> > Hello
>>> >
>>> > When playing recording with audio track with 6 channels, I just get
>>> > the sound (background music) but no voice. When playing recordings
>>> > with only 2 channels, it works
>>> > I only have 2 speakers (left / right) to my computer.
>>> > I look around with settings of alsa but can't find anything revelant.
>>> > Here is my setup :
>>> > hardware : zotac ion-c
>>> > soft : mythtv 0.22-fixes through r22772
>>> > Audio output device : ALSA:default
>>> > Passtrhough output device : Default
>>> > Max audio channel : Stereo
>>> > Upmix : Passive
>>> > Mixer Device : ALSA:default
>>> > mixer controls PCM
>>> >
>>> > Any help will be greatly appreciated
>>> > Guilaume
>>> >
>>>
>>> I continue to search : mplayer plays this show perflectly over hdmi
>>> audio with :
>>> mplayer -ao alsa:device=hdmi 1051_20091111211700.mpg
>>>
>>> In myth, if I setup Audio output device to ALSA:hdmi : same problem :
>>> just background sound (music, noise) but no voice. I also tried
>>> surround40 or surround41 or surround50 but nothing happy.
>>> Some additionnal info :
>>> $ aplay -L
>>> default:CARD=NVidia
>>>    HDA NVidia, ALC662 Analog
>>>    Default Audio Device
>>> front:CARD=NVidia,DEV=0
>>>    HDA NVidia, ALC662 Analog
>>>    Front speakers
>>> surround40:CARD=NVidia,DEV=0
>>>    HDA NVidia, ALC662 Analog
>>>    4.0 Surround output to Front and Rear speakers
>>> surround41:CARD=NVidia,DEV=0
>>>    HDA NVidia, ALC662 Analog
>>>    4.1 Surround output to Front, Rear and Subwoofer speakers
>>> surround50:CARD=NVidia,DEV=0
>>>    HDA NVidia, ALC662 Analog
>>>    5.0 Surround output to Front, Center and Rear speakers
>>> surround51:CARD=NVidia,DEV=0
>>>    HDA NVidia, ALC662 Analog
>>>    5.1 Surround output to Front, Center, Rear and Subwoofer speakers
>>> surround71:CARD=NVidia,DEV=0
>>>    HDA NVidia, ALC662 Analog
>>>    7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
>>> hdmi:CARD=NVidia,DEV=0
>>>    HDA NVidia, NVIDIA HDMI
>>>    HDMI Audio Output
>>> null
>>>    Discard all samples (playback) or generate zero samples (capture)
>>>
>>> please help, waf is lowering :( ;)
>
> Thanks for your answer
>
>> What is your asound.conf file?
>
> I don't have one.
>
>>  It should be something simple like this:
>>
>>  pcm.!default {
>>       type hw
>>       card 0
>>       device 1
>>
>> }
>
> I tried it but no difference.
>
>>
>>
>> If it has a bunch of channel decoding then that is the problem because
>> obviously you are missing the center channel.  From all you say, it
>> sounds like you have the myth box set up to decide the digital and
>> re-encode it.  That isn't what you want to do, you want to pass it
>> through unchanged.
>
>
> I may missunderstoud you : I don't want pass trough and digital out, I
> just would like  stereo ou surround 4.0 analog output.
> I just tried hdmi in order to have a proof of concept, but it may be a
> wrong example.
> BTW I tried with mplayer using surrond40 with :
> mplayer -ao alsa:device=surround40 1051_20091111211700.mpg
> I get sound + voice.
> In myth, still no voice.
>
> I read your link to the wiki, it is very interesting but I don't want
> digital output.
>
> Thanks a lot
> Guillaume
>

Sorry, I thought you were using digital output but if you are using
analog then that explains what you are seeing.  Your system is set up
for surround sound and you only have two speakers.  You probably just
need to open the mixer and turn off the other outputs.

run alsamixer

Hope this helps.

Allen