[mythtv-users] Audio issues - New Install

Wed Aug 9 19:18:47 UTC 2017

On Wed, Aug 9, 2017 at 2:18 PM, Ashu Desai <ashu.desai at gmail.com> wrote:

>
>
> 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
> }
>
>
>
> Here's the link i forgot to add: https://lists.gt.net/mythtv/users/472386
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