[mythtv-users] Audio issues - New Install

Fri Aug 11 19:05:06 UTC 2017

On Fri, Aug 11, 2017 at 2:01 PM, Karl Newman <newmank1 at asme.org> wrote:

> On Fri, Aug 11, 2017 at 10:18 AM, Ashu Desai <ashu.desai at gmail.com> 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
>>>>>>
>>>>>>
>>>>> I have only a stereo-via-hdmi setup with a nvidia GT 710 card.  At
>>>>> present I'm using the 340.102 driver and Fedora 25.  I haven't knowingly
>>>>> done anything with alsa or pulse.
>>>>>
>>>>> ALSA:hdmi:CARD=NVidia,DEV=1 , selected from the frontend setup wizard,
>>>>> works with myth, and with vlc when selected as its audio device.  DEV=0
>>>>> doesn't, but is selected by SMplayer which seems to offer no other hdmi
>>>>> option.  Just FYI
>>>>>
>>>>> John
>>>>>
>>>>>
>>>>>
>>>>>
>>>>
>>>>  I have an older FE (0.27/fixes) that works fine on the same hardware.
>>>> I didnt want upgrade process so got a new SAS drive and doing a brand new
>>>> install on the same HW.
>>>>
>>>> I can see some differences off the bat. example alsamixer shows default
>>>> card as HDA Nvidia (as opposed to Pulse) and Chipset as Nvidia MCP79/7A
>>>> HDMI (as opposed to Realtek something)
>>>>
>>>> also alsamixer shows the Nvidia card and any changes I make are saved
>>>> if I do alsactl store
>>>>
>>>> With the new setup, I have to do F6 to select the Nvidia card and no
>>>> matter what I do - doesn't save the config.even if I start alsamixer right
>>>> away.
>>>>
>>>>
>>>>
>>> I added optical cable - and everything works fine. HDMI audio - comes
>>> out from different speakers.
>>>
>>
>>
>> Any ideas? I am trying to debug but not sure what to do here.
>>
>> Here's what I found searching "mythtv wrong speaker":
> http://lists.mythtv.org/pipermail/mythtv-users/2011-January/308620.html
>
> Karl
>
>
Yep - I did just that - and it didnt work. Now it may have to do with the
alsamixer issue - it doesn't save changes. So when I press escape - it
seems to go back to default rather than the selected Sound Card.

Not sure how to get alsamixer to save.

>
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