[mythtv-users] Audio issues - New Install

Wed Aug 9 18:54:55 UTC 2017

On Wed, Aug 9, 2017 at 1:31 PM, Peter Bennett <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
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