[mythtv-users] Audio issues - New Install

Karl Newman newmank1 at asme.org
Fri Aug 11 19:08:29 UTC 2017


On Fri, Aug 11, 2017 at 12:05 PM, Ashu Desai <ashu.desai at gmail.com> wrote:

>
>
> 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.
>

Maybe you need to disable Pulse Audio... I don't use it, but I think it
might override alsa.

Karl
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mythtv.org/pipermail/mythtv-users/attachments/20170811/e2b24ee6/attachment.html>


More information about the mythtv-users mailing list