[mythtv-users] HDMI audio issues on Intel NUC

[Matt W]

Hi Mike-- thanks for the note. yes it is installed and running. at one
point I saw it (and mythfrontend) using the devices (with lsof or
fuser I forget which).  snippet out of alsa-info.sh:

!!------------
Driver version:     k3.16.0-4-amd64
Library version:    1.0.28
Utilities version:  1.0.28

!!Loaded ALSA modules
!!-------------------
snd_hda_intel
snd_hda_intel

!!Sound Servers on this system
!!----------------------------
Pulseaudio:
     Installed - Yes (/usr/bin/pulseaudio)
     Running - Yes

!!Soundcards recognised by ALSA
!!-----------------------------
 0 [HDMI           ]: HDA-Intel - HDA Intel HDMI
                     HDA Intel HDMI at 0xf7c34000 irq 64

1 [PCH            ]: HDA-Intel - HDA Intel PCH
                     HDA Intel PCH at 0xf7c30000 irq 62


to be honest, the interaction of ALSA and pulse confuses me.  I
haven't tried any configurations beyond stock setup yet so I'll play
with those.

On Wed, Jul 8, 2015 at 1:31 AM, Mike Perkins
<mikep at randomtraveller.org.uk> wrote:
> On 08/07/15 08:24, Matt W wrote:
>>
>> Hi -- I'm running a frontend on an Intel NUC D34010WYK. The backend is
>> another box, running the same version of Debian and MythTV, connected
>> over gigabit wired network.  I am using the current release version:
>>
>> mythtv at myth-nuc:~/frontend.logs$ mythfrontend --version
>>
>> Please attach all output as a file in bug reports.
>> MythTV Version : e4f65c8
>> MythTV Branch : tag: v0.27.4
>> Network Protocol : 77
>> Library API : 0.27.20140719-1
>> QT Version : 4.8.6
>>
>> Options compiled in:
>>   linux profile use_hidesyms using_alsa using_oss using_backend
>> using_bindings_php using_dvb using_frontend using_hdhomerun
>> using_ceton using_hdpvr using_ivtv using_joystick_menu using_libxml2
>> using_lirc using_mheg using_opengl using_opengl_video using_qtwebkit
>> using_qtscript using_qtdbus using_taglib using_v4l2 using_x11
>> using_xrandr using_profiletype using_mythlogserver using_bindings_php
>> using_mythtranscode using_opengl using_vaapi using_ffmpeg_threads
>> using_mheg using_libxml2
>>
>> OS is Debian Jessie/8:  3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt11-1
>>
>> using the VAAPI normal profile (needed SNA acceleration set), the
>> video looks good and does 1080 content well.
>>
>> Audio is another matter. It will work for some content but gets
>> intermittent on LiveTV playback and some recorded shows. I get "ALSA:
>> WriteAudio: buffer underrun" and plenty of "ALSA: Try to manually
>> increase audio buffer with: echo 576 | sudo tee
>> /proc/asound/card0/pcm3p/sub0/prealloc" (no matter what number I push
>> into the prealloc).
>>
>> Upmixing is turned off, but sometimes it seems to help in playback
>> when changed manually in the playback 'auto detect' button.  But then
>> not long after, the audio will go out and the log will show buffer
>> underruns.
>>
>> Can someone recommend some troubleshooting methods here?  My usual net
>> search skills have yielded nothing concrete. Any help is appreciated!
>> thanks
>>
> Do you have PulseAudio installed? Although it was once frowned upon you may
> find this fixes your problem. Lately, pulse has greatly improved and several
> people here report mythtv working well with it.
>
> - Of course you still have to configure it right...
>
> --
>
> Mike Perkins
>
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