[mythtv-users] Audio issues - New Install
Karl Newman
newmank1 at asme.org
Fri Aug 11 19:01:45 UTC 2017
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
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