[mythtv-users] HDMI audio issues on Intel NUC

Matt W mwood23 at gmail.com
Wed Jul 8 16:45:43 UTC 2015


Hi Stuart-- So far I've mainly seen it on live tv playback. I tried
several different channels with similar results (OTA ATSC).  Here's an
older recording that also gave me some trouble:

root at myth-back:/var/media# mythffprobe ./mythvideo/1091_20140802180000.mpg
ffprobe version 1.2.7 Copyright (c) 2007-2014 the FFmpeg developers
  built on Jun 22 2015 22:08:00 with gcc 4.9.2 (Debian 4.9.2-10)
  configuration: --prefix=/usr/local/mythtv --enable-libmp3lame
--enable-audio-alsa --enable-libx264 --enable-libfaac --enable-nonfree
--enable-xrandr --enable-libxvid
  libavutil      52. 18.100 / 52. 18.100
  libavcodec     54. 92.100 / 54. 92.100
  libavformat    54. 63.104 / 54. 63.104
  libavdevice    54.  3.103 / 54.  3.103
  libavfilter     3. 42.103 /  3. 42.103
  libswscale      2.  2.100 /  2.  2.100
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  2.100 / 52.  2.100
[mpegts @ 0x1577ea0] PES packet size mismatch
    Last message repeated 2 times
Input #0, mpegts, from './mythvideo/1091_20140802180000.mpg':
  Duration: 00:29:59.52, start: 36873.539022, bitrate: 13231 kb/s
    Stream #0:0[0x31]: Video: mpeg2video (Main), yuv420p, 1920x1080
[SAR 1:1 DAR 16:9], 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
    Stream #0:1[0x33](eng): Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz,
5.1(side), fltp, 384 kb/s
    Stream #0:2[0x34](spa): Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz,
mono, fltp, 96 kb/s (visual impaired)
    Stream #0:3[0x35](fra): Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz,
mono, fltp, 96 kb/s

On Wed, Jul 8, 2015 at 1:43 AM, Stuart Auchterlonie
<stuarta at squashedfrog.net> 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
>> -Matt
>
> Is it all your recordings or only specific content types?
>
> If a specific content type what is the output from
>
> $ mythffprobe <recording_file>
>
> substitute <recording_file> with a filename of a recording
>
>
> Regards
> Stuart
>
>
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