[mythtv-users] need help getting an Nvidia card working

[Jim Abernathy]

On 12/25/2017 11:14 AM, Jim Abernathy wrote:
> I'm trying to improve the mythtv playback on an old Core 2 Duo system.
> With the internal Intel GFX there were video issues with HD content, so
> I bought a GT 710 PCIe GFX card.  The Acer monitor has built in speakers
> so I connect the GT710 to the monitor with HDMI the same as I used to do
> the Intel internal GFX.
>
> The first thing I did was install the Nvidia proprietary GFX driver and
> make sure the video and audio worked correctly in normal Ubuntu 16.04
> sound and video apps. I have mute, vol+, and vol- buttons on my USB
> keyboard and I can use them to control volume in normal Ubuntu sound
> apps and I used to be able to use them with Mythtv frontend with Intel GFX.
>
> However, if I run mythtv frontend on Nvidia GFX everything works great
> until I touch the sound buttons.  mythtv FE freezes and I have to use
> CTL-ALT-F1 to get to a login screen so I can reboot.
>
> The first time I ran Mythtv FE with the new Nvidia GFX card I changed
> the setup to VDPAU HQ and I set audio to the NVIDIA HDMI Dev 1.  I made
> sure the theme painter was auto.  I also tested the SD and HD test
> videos and they work with sound perfectly.  It's just when I touch the
> mute, vol-, and vol+ buttons on the USB keyboard.
>
> Any ideas where to start checking? or did I miss a setting when I
> switched in the GT710 card?
>
> Jim A
>
I forgot to run and include the log after the freeze.  Here is part of it.

Dec 25 11:17:29 martha-ubuntu mythfrontend.real: mythfrontend[5074]: I 
CoreContext mythrender_vdpau.cpp:429 (Create) VDPAU: Created VDPAU 
render device 1920x1080
Dec 25 11:17:29 martha-ubuntu mythfrontend.real: mythfrontend[5074]: N 
CoreContext mythplayer.cpp:532 (CheckExtraAudioDecode) Player(0): 
Forcing decode extra audio option on (Video method requires it).
Dec 25 11:17:29 martha-ubuntu mythfrontend.real: mythfrontend[5074]: I 
CoreContext avformatdecoder.cpp:2615 (OpenAVCodec) AFD: Opened codec 
0x968d080, id(MPEG2VIDEO) type(Video)
Dec 25 11:17:29 martha-ubuntu mythfrontend.real: mythfrontend[5074]: I 
CoreContext audio/audiooutputbase.cpp:823 (Reconfigure) AOBase: Opening 
audio device 'hdmi:CARD=NVidia,DEV=1' ch 2(6) sr 48000 sf signed 32 bit 
reenc 0
Dec 25 11:17:29 martha-ubuntu mythfrontend.real: mythfrontend[5074]: W 
CoreContext audio/audiooutputalsa.cpp:775 (SetParameters) ALSA: 
Requested 500000us got 170666 buffer time
Dec 25 11:17:29 martha-ubuntu mythfrontend.real: mythfrontend[5074]: W 
CoreContext audio/audiooutputalsa.cpp:243 (IncPreallocBufferSize) ALSA: 
Try to manually increase audio buffer with: echo 192 | sudo tee 
/proc/asound/card1/pcm7p/sub0/prealloc
Dec 25 11:17:29 martha-ubuntu mythfrontend.real: mythfrontend[5074]: E 
CoreContext audio/audiooutputalsa.cpp:953 (OpenMixer) ALSA: no playback 
control PCM found on mixer device default
Dec 25 11:17:29 martha-ubuntu mythfrontend.real: mythfrontend[5074]: E 
CoreContext audio/audiooutputalsa.cpp:498 (OpenDevice) ALSA: Unable to 
open audio mixer. Volume control disabled
Dec 25 11:17:30 martha-ubuntu mythfrontend.real: mythfrontend[5074]: N 
CoreContext mythplayer.cpp:2231 (PrebufferEnoughFrames) Player(0): 
Waited 101ms for video buffers AAAAAAAAAAAAAA
Dec 25 11:17:30 martha-ubuntu mythfrontend.real: mythfrontend[5074]: I 
CoreContext mythrender_vdpau.cpp:615 (CheckOutputSurfaces) VDPAU: Added 
2 output surfaces (total 4, max 4)
Dec 25 11:17:56 martha-ubuntu mythfrontend.real: mythfrontend[5074]: E 
Decoder mythplayer.cpp:3504 (DecoderGetFrame) Player(0): Decoder timed 
out waiting for free video buffers.

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