[mythtv-users] Audio issues - New Install

Ashu Desai ashu.desai at gmail.com
Thu Aug 10 13:44:19 UTC 2017


On Wed, Aug 9, 2017 at 3:11 PM, Ashu Desai <ashu.desai at gmail.com> wrote:

>
>
> On Wed, Aug 9, 2017 at 2:50 PM, John Pilkington <J.Pilk at tesco.net> wrote:
>
>> On 09/08/17 19:54, Ashu Desai wrote:
>>
>>
>>>
>>> On Wed, Aug 9, 2017 at 1:31 PM, Peter Bennett <cats22 at comcast.net
>>> <mailto: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
>>>
>>>
>> 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.
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