[mythtv-users] Audio issues - New Install
Ashu Desai
ashu.desai at gmail.com
Fri Aug 11 17:18:39 UTC 2017
>
>
>>>>
>>>>
>>>> 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.
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