<div dir="ltr">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.</div><br><div class="gmail_quote"><div dir="ltr">On Tue, Nov 13, 2018 at 9:29 PM Jim Abernathy <<a href="mailto:jfabernathy@gmail.com">jfabernathy@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
On 11/13/18 10:11 PM, Mike Chinander wrote:<br>
> Can you run ffprobe (or similar) on a PBS recording and on a recording <br>
> from another channel to see how the audio (and video) is different? <br>
> What are you playing the audio on (TV, receiver, etc.)?<br>
><br>
my RP3 B+ is connected via HDMI to A/V receiver -> 4K TV<br>
<br>
here's the ffprobe output from the PBS recording:<br>
<br>
jim@mythbuntu:~$ ffprobe /mnt/md1/recorded-tv2/1041_20181031020000.ts<br>
ffprobe version 3.4.4-0ubuntu0.18.04.1 Copyright (c) 2007-2018 the <br>
FFmpeg developers<br>
built with gcc 7 (Ubuntu 7.3.0-16ubuntu3)<br>
configuration: --prefix=/usr --extra-version=0ubuntu0.18.04.1 <br>
--toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu <br>
--incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping <br>
--enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa <br>
--enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca <br>
--enable-libcdio --enable-libflite --enable-libfontconfig <br>
--enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm <br>
--enable-libmp3lame --enable-libmysofa --enable-libopenjpeg <br>
--enable-libopenmpt --enable-libopus --enable-libpulse <br>
--enable-librubberband --enable-librsvg --enable-libshine <br>
--enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh <br>
--enable-libtheora --enable-libtwolame --enable-libvorbis <br>
--enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 <br>
--enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi <br>
--enable-omx --enable-openal --enable-opengl --enable-sdl2 <br>
--enable-libdc1394 --enable-libdrm --enable-libiec61883 <br>
--enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 <br>
--enable-shared<br>
libavutil 55. 78.100 / 55. 78.100<br>
libavcodec 57.107.100 / 57.107.100<br>
libavformat 57. 83.100 / 57. 83.100<br>
libavdevice 57. 10.100 / 57. 10.100<br>
libavfilter 6.107.100 / 6.107.100<br>
libavresample 3. 7. 0 / 3. 7. 0<br>
libswscale 4. 8.100 / 4. 8.100<br>
libswresample 2. 9.100 / 2. 9.100<br>
libpostproc 54. 7.100 / 54. 7.100<br>
[mpegts @ 0x555c4fcfe080] PES packet size mismatch<br>
Last message repeated 1 times<br>
Input #0, mpegts, from '/mnt/md1/recorded-tv2/1041_20181031020000.ts':<br>
Duration: 00:59:59.95, start: 37133.043156, bitrate: 5940 kb/s<br>
Program 1<br>
Stream #0:0[0x31]: Video: mpeg2video (Main) ([2][0][0][0] / <br>
0x0002), yuv420p(tv, bt709, top first), 1920x1080 [SAR 1:1 DAR 16:9], <br>
Closed Captions, 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc<br>
Stream #0:1[0x34]: Audio: ac3 ([129][0][0][0] / 0x0081), 48000 Hz, <br>
stereo, fltp, 384 kb/s<br>
Stream #0:2[0x35]: Audio: ac3 ([129][0][0][0] / 0x0081), 48000 Hz, <br>
stereo, fltp, 96 kb/s<br>
jim@mythbuntu:~$<br>
<br>
Now for the normal audio from another network:<br>
<br>
jim@mythbuntu:~$ ffprobe /mnt/md0/recorded-tv1/1171_20181031020000.ts<br>
ffprobe version 3.4.4-0ubuntu0.18.04.1 Copyright (c) 2007-2018 the <br>
FFmpeg developers<br>
built with gcc 7 (Ubuntu 7.3.0-16ubuntu3)<br>
configuration: --prefix=/usr --extra-version=0ubuntu0.18.04.1 <br>
--toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu <br>
--incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping <br>
--enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa <br>
--enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca <br>
--enable-libcdio --enable-libflite --enable-libfontconfig <br>
--enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm <br>
--enable-libmp3lame --enable-libmysofa --enable-libopenjpeg <br>
--enable-libopenmpt --enable-libopus --enable-libpulse <br>
--enable-librubberband --enable-librsvg --enable-libshine <br>
--enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh <br>
--enable-libtheora --enable-libtwolame --enable-libvorbis <br>
--enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 <br>
--enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi <br>
--enable-omx --enable-openal --enable-opengl --enable-sdl2 <br>
--enable-libdc1394 --enable-libdrm --enable-libiec61883 <br>
--enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 <br>
--enable-shared<br>
libavutil 55. 78.100 / 55. 78.100<br>
libavcodec 57.107.100 / 57.107.100<br>
libavformat 57. 83.100 / 57. 83.100<br>
libavdevice 57. 10.100 / 57. 10.100<br>
libavfilter 6.107.100 / 6.107.100<br>
libavresample 3. 7. 0 / 3. 7. 0<br>
libswscale 4. 8.100 / 4. 8.100<br>
libswresample 2. 9.100 / 2. 9.100<br>
libpostproc 54. 7.100 / 54. 7.100<br>
[mpegts @ 0x5613f63e7080] PES packet size mismatch<br>
Last message repeated 1 times<br>
Input #0, mpegts, from '/mnt/md0/recorded-tv1/1171_20181031020000.ts':<br>
Duration: 00:59:59.31, start: 34516.228000, bitrate: 12968 kb/s<br>
Program 1<br>
Stream #0:0[0x31]: Video: mpeg2video (Main) ([2][0][0][0] / <br>
0x0002), yuv420p(tv, top first), 1920x1080 [SAR 1:1 DAR 16:9], Closed <br>
Captions, 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc<br>
Stream #0:1[0x34](eng): Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, <br>
5.1(side), fltp, 384 kb/s<br>
Stream #0:2[0x35](spa): Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, <br>
stereo, fltp, 192 kb/s (visual impaired)<br>
jim@mythbuntu:~$<br>
<br>
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</blockquote></div>