[mythtv-users] Audio issues - New Install

Wed Aug 9 19:18:02 UTC 2017

On Wed, Aug 9, 2017 at 1:54 PM, Ashu Desai <ashu.desai at gmail.com> wrote:

>
>
> On Wed, Aug 9, 2017 at 1:31 PM, Peter Bennett <cats22 at comcast.net> wrote:
>
>>
>>
>> On 08/09/2017 02:09 PM, Ashu Desai wrote:
>>
>> I have a brand new install on CentOS 7.
>>
>> Backend is a VM and FE is on Zotac Ion
>>
>> When I open Alsammixer, i get the default one
>>
>> http://tinypic.com/r/2eldu9s/9
>>
>> I then press F6 and select the NVidia card
>>
>> http://tinypic.com/r/rli9ty/9
>>
>> However, if I press escape and go right back to alsamixer, it reverts it
>> back to the original one.
>>
>> lspci -vvnn reveals this for Audio:
>>
>> 00:08.0 Audio device [0403]: NVIDIA Corporation MCP79 High Definition
>> Audio [10de:0ac0] (rev b1)
>>         Subsystem: PC Partner Limited / Sapphire Technology Device
>> [174b:437b]
>>         Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
>> ParErr- Stepping- SERR- FastB2B- DisINTx-
>>         Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort-
>> <TAbort- <MAbort- >SERR- <PERR- INTx-
>>         Latency: 0 (500ns min, 1250ns max)
>>         Interrupt: pin A routed to IRQ 22
>>         Region 0: Memory at fae78000 (32-bit, non-prefetchable) [size=16K]
>>         Capabilities: <access denied>
>>         Kernel driver in use: snd_hda_intel
>>         Kernel modules: snd_hda_intel
>>
>>
>> [mythtv at mythfe7 ~]$ aplay -l
>> **** List of PLAYBACK Hardware Devices ****
>> card 0: NVidia [HDA NVidia], device 0: ALC662 rev1 Analog [ALC662 rev1
>> Analog]
>>   Subdevices: 1/1
>>   Subdevice #0: subdevice #0
>> card 0: NVidia [HDA NVidia], device 1: ALC662 rev1 Digital [ALC662 rev1
>> Digital]
>>   Subdevices: 1/1
>>   Subdevice #0: subdevice #0
>> card 0: NVidia [HDA NVidia], device 3: HDMI 0 [HDMI 0]
>>   Subdevices: 1/1
>>   Subdevice #0: subdevice #0
>>
>> [mythtv at mythfe7 ~]$ aplay -L
>> null
>>     Discard all samples (playback) or generate zero samples (capture)
>> pulse
>>     PulseAudio Sound Server
>> sysdefault:CARD=NVidia
>>     HDA NVidia, ALC662 rev1 Analog
>>     Default Audio Device
>> front:CARD=NVidia,DEV=0
>>     HDA NVidia, ALC662 rev1 Analog
>>     Front speakers
>> surround21:CARD=NVidia,DEV=0
>>     HDA NVidia, ALC662 rev1 Analog
>>     2.1 Surround output to Front and Subwoofer speakers
>> surround40:CARD=NVidia,DEV=0
>>     HDA NVidia, ALC662 rev1 Analog
>>     4.0 Surround output to Front and Rear speakers
>> surround41:CARD=NVidia,DEV=0
>>     HDA NVidia, ALC662 rev1 Analog
>>     4.1 Surround output to Front, Rear and Subwoofer speakers
>> surround50:CARD=NVidia,DEV=0
>>     HDA NVidia, ALC662 rev1 Analog
>>     5.0 Surround output to Front, Center and Rear speakers
>> surround51:CARD=NVidia,DEV=0
>>     HDA NVidia, ALC662 rev1 Analog
>>     5.1 Surround output to Front, Center, Rear and Subwoofer speakers
>> surround71:CARD=NVidia,DEV=0
>>     HDA NVidia, ALC662 rev1 Analog
>>     7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
>> iec958:CARD=NVidia,DEV=0
>>     HDA NVidia, ALC662 rev1 Digital
>>     IEC958 (S/PDIF) Digital Audio Output
>> hdmi:CARD=NVidia,DEV=0
>>     HDA NVidia, HDMI 0
>>     HDMI Audio Output
>>
>>
>> Here's my /etc/asound.conf
>>
>> # Place your global alsa-lib configuration here...
>> #
>> pcm.!default {
>>        type hw
>>        card 0
>>        device 3
>>    }
>> ~
>> ~
>>
>> Under Mythfrontend Setup/Audio
>> I have selected the ALSA:hdmi:Card=NVIDIA:DEV=0 that comes as option
>>
>> When you do "Test" - everything comes ok except sound for Center (Comes
>> off Surround Left) & Surround Left (swapped to Center)
>>
>> I also can't hear audio off quite a few movies, and when I check my audio
>> receiver shows input as PCM. The ones that have AC3 or DTS comes out fine
>> (although the sound coming off wrong speakers irks me)
>>
>> I am not hearing any TrueHD even though that is checked along with HBR
>> box that's checked by default
>>
>> I am giving data that I feel is needed so apologies if it's too much or
>> too little.
>> .
>>
>> I am also hoping alsamixer can change default from PulseAudio to HDMI
>> I can def give any other info that's required to solve this
>>
>>
>>
>> Check your speaker configuration - 5.1 7.1 or stereo. This can affect
>> which speaker the sounds come out of for PCM. You can try different values
>> and see if anything works,
>>
>
> I have 5.1
>
>>
>> Is the audio passed to the sound system via HDMI?
>>
>
> Yes, HDMI
>
>
>> If there is a TOSLINK connection in there, that may affect things,
>> because TOSLINK only supports 2 channels in PCM mode, so if it is sending
>> more than 2 channels they may get lost.
>>
>> If AC3 and DTS is getting to the wrong speakers you must have something
>> else going on, because the sound system itself will be sorting out which
>> track goes to which speaker. (Speaker wires crossed?)
>>
>>
> When I give the cli command "speaker-test...." audio comes out perfectly
> like it's supposed to.
>
>
>> Note that the audio system test uses PCM sound. So you cannot test how
>> AC3 will work that way. You say that the audio system test works but PCM
>> movies don't work. That does not make sense.
>>
>> If PCM does not work at all you can get past it by selecting "Upconvert
>> stereo to 5.1 surround". That will convert PCM audio to Dolby Digital
>> (AC3).
>>
>
> I already have it checked.
>
>
> Is there a way to fix the alsamixer thing? It somehow keeps showing
> default as Pulse and doesn't seem to retain my changes after I press esc
>

BTW this link seems to be also talking same thing I am - however, when I
added the "pcm.!hdmi..." piece in ~/.asoundrc file (there wasn't any such
file so I had to create it) - nothing happened. Is it still valid being
that I have the latest alsa?

Also added same in /etc/asound.conf - which now looks like this:

pcm.!default {
       type hw
       card 0
       device 3
   }

pcm.!hdmi {
type route
slave.pcm
"cards.HDA-Intel.pcm.hdmi.0:CARD=NVidia,AES0=0x4,AES1=0x82,AES2=0x0,AES3=0x2"
ttable.0.0 1
ttable.1.1 1
ttable.6.4 1
ttable.7.5 1
ttable.4.2 1
ttable.5.3 1
ttable.2.6 1
ttable.3.7 1
}
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