[mythtv-users] mythfrontend on Raspberry 3 B+ audio issues.

Mike Chinander chinander at gmail.com
Wed Nov 14 04:18:58 UTC 2018 

The only obvious thing I see that is different is the PBS audio stream is
stereo vs. 5.1 for the other one, but I don't know why that would make a
difference. Also, the overall bitrate is much less for the PBS stream
(doesn't seem relevant to audio though). I use Kodi with the MythTV PVR
add-on on RPi3 as my primary frontend; I would try enabling/disabling
(opposite of your current setting) audio passthrough to see if that makes a
difference. I have it enabled on my setup. I think it's in Kodi's System
Settings->Audio.

On Tue, Nov 13, 2018 at 9:29 PM Jim Abernathy <jfabernathy at gmail.com> wrote:

>
> On 11/13/18 10:11 PM, Mike Chinander wrote:
> > Can you run ffprobe (or similar) on a PBS recording and on a recording
> > from another channel to see how the audio (and video) is different?
> > What are you playing the audio on (TV, receiver, etc.)?
> >
> my RP3 B+ is connected via HDMI to A/V receiver -> 4K TV
>
> here's the ffprobe output from the PBS recording:
>
> jim at mythbuntu:~$ ffprobe /mnt/md1/recorded-tv2/1041_20181031020000.ts
> ffprobe version 3.4.4-0ubuntu0.18.04.1 Copyright (c) 2007-2018 the
> FFmpeg developers
>    built with gcc 7 (Ubuntu 7.3.0-16ubuntu3)
>    configuration: --prefix=/usr --extra-version=0ubuntu0.18.04.1
> --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu
> --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping
> --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa
> --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca
> --enable-libcdio --enable-libflite --enable-libfontconfig
> --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm
> --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg
> --enable-libopenmpt --enable-libopus --enable-libpulse
> --enable-librubberband --enable-librsvg --enable-libshine
> --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh
> --enable-libtheora --enable-libtwolame --enable-libvorbis
> --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265
> --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi
> --enable-omx --enable-openal --enable-opengl --enable-sdl2
> --enable-libdc1394 --enable-libdrm --enable-libiec61883
> --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264
> --enable-shared
>    libavutil      55. 78.100 / 55. 78.100
>    libavcodec     57.107.100 / 57.107.100
>    libavformat    57. 83.100 / 57. 83.100
>    libavdevice    57. 10.100 / 57. 10.100
>    libavfilter     6.107.100 /  6.107.100
>    libavresample   3.  7.  0 /  3.  7.  0
>    libswscale      4.  8.100 /  4.  8.100
>    libswresample   2.  9.100 /  2.  9.100
>    libpostproc    54.  7.100 / 54.  7.100
> [mpegts @ 0x555c4fcfe080] PES packet size mismatch
>      Last message repeated 1 times
> Input #0, mpegts, from '/mnt/md1/recorded-tv2/1041_20181031020000.ts':
>    Duration: 00:59:59.95, start: 37133.043156, bitrate: 5940 kb/s
>    Program 1
>      Stream #0:0[0x31]: Video: mpeg2video (Main) ([2][0][0][0] /
> 0x0002), yuv420p(tv, bt709, top first), 1920x1080 [SAR 1:1 DAR 16:9],
> Closed Captions, 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
>      Stream #0:1[0x34]: Audio: ac3 ([129][0][0][0] / 0x0081), 48000 Hz,
> stereo, fltp, 384 kb/s
>      Stream #0:2[0x35]: Audio: ac3 ([129][0][0][0] / 0x0081), 48000 Hz,
> stereo, fltp, 96 kb/s
> jim at mythbuntu:~$
>
> Now for the normal audio from another network:
>
> jim at mythbuntu:~$ ffprobe /mnt/md0/recorded-tv1/1171_20181031020000.ts
> ffprobe version 3.4.4-0ubuntu0.18.04.1 Copyright (c) 2007-2018 the
> FFmpeg developers
>    built with gcc 7 (Ubuntu 7.3.0-16ubuntu3)
>    configuration: --prefix=/usr --extra-version=0ubuntu0.18.04.1
> --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu
> --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping
> --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa
> --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca
> --enable-libcdio --enable-libflite --enable-libfontconfig
> --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm
> --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg
> --enable-libopenmpt --enable-libopus --enable-libpulse
> --enable-librubberband --enable-librsvg --enable-libshine
> --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh
> --enable-libtheora --enable-libtwolame --enable-libvorbis
> --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265
> --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi
> --enable-omx --enable-openal --enable-opengl --enable-sdl2
> --enable-libdc1394 --enable-libdrm --enable-libiec61883
> --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264
> --enable-shared
>    libavutil      55. 78.100 / 55. 78.100
>    libavcodec     57.107.100 / 57.107.100
>    libavformat    57. 83.100 / 57. 83.100
>    libavdevice    57. 10.100 / 57. 10.100
>    libavfilter     6.107.100 /  6.107.100
>    libavresample   3.  7.  0 /  3.  7.  0
>    libswscale      4.  8.100 /  4.  8.100
>    libswresample   2.  9.100 /  2.  9.100
>    libpostproc    54.  7.100 / 54.  7.100
> [mpegts @ 0x5613f63e7080] PES packet size mismatch
>      Last message repeated 1 times
> Input #0, mpegts, from '/mnt/md0/recorded-tv1/1171_20181031020000.ts':
>    Duration: 00:59:59.31, start: 34516.228000, bitrate: 12968 kb/s
>    Program 1
>      Stream #0:0[0x31]: Video: mpeg2video (Main) ([2][0][0][0] /
> 0x0002), yuv420p(tv, top first), 1920x1080 [SAR 1:1 DAR 16:9], Closed
> Captions, 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
>      Stream #0:1[0x34](eng): Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz,
> 5.1(side), fltp, 384 kb/s
>      Stream #0:2[0x35](spa): Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz,
> stereo, fltp, 192 kb/s (visual impaired)
> jim at mythbuntu:~$
>
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