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audio slowly gets out of sync


allen00se

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allen00se

Hello all, using my livetv setup and watching over the web client, I notice that within a few minutes there is a noticeable delay in the audio, any idea what could be the cause? Which logs would you need to help me find the issue?

Thanks,

Krys

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krustyreturns

Probably the ffmpeg log.  Is this standard def or high def?  I think I have seen this too on my standard def channels.

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  • 2 weeks later...
Tikuf

Pretty sure I know what the issue is here an ffmpeg log will confirm it (and the fix I have in mind).

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krustyreturns

hi @@Tikuf,

 

It looks like the poster won't be up for a while, so... here is  a log from a run I just did.  I let the video go for about one minute, by the end it was out of sync pretty bad.  Hope this helps.

 

ffmpeg version N-61061-gf34cceb Copyright © 2000-2014 the FFmpeg developers
  built on Mar  4 2014 00:44:56 with gcc 4.8.2 (GCC)
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-zlib
  libavutil      52. 66.101 / 52. 66.101
  libavcodec     55. 52.102 / 55. 52.102
  libavformat    55. 33.101 / 55. 33.101
  libavdevice    55. 11.100 / 55. 11.100
  libavfilter     4.  2.100 /  4.  2.100
  libswscale      2.  5.101 /  2.  5.101
  libswresample   0. 18.100 /  0. 18.100
  libpostproc    52.  3.100 / 52.  3.100
[mpegts @ 026c8260] DTS 196740 < 202770 out of order
[mpegts @ 026c8260] PES packet size mismatch
Input #0, mpegts, from 'file:C:\Users\Victor\Desktop\wtvs\TempSWMC\LiveTV_MediaBrowser^0_Cable_3_2014_03_17_20_25_06.ts':
  Duration: 00:00:01.65, start: 2.109000, bitrate: 7808 kb/s
  Program 1 
    Stream #0:0[0x1011]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420p(tv), 720x480 [sAR 8:9 DAR 4:3], max. 7500 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
    Stream #0:1[0x1100]: Audio: mp2 ([3][0][0][0] / 0x0003), 32000 Hz, stereo, s16p, 224 kb/s
[libvpx @ 04d40320] v1.3.0
Output #0, webm, to 'C:\Users\Victor\AppData\Roaming\MediaBrowser-Server\transcoding-temp\fd746774-bdfc-e677-99cf-ef020ec25adc.webm':
  Metadata:
    encoder         : Lavf55.33.101
    Stream #0:0: Video: vp8 (libvpx), yuv420p, 720x480 [sAR 8:9 DAR 4:3], q=-1--1, 1372 kb/s, 1k tbn, 29.97 tbc
    Stream #0:1: Audio: vorbis (libvorbis), 32000 Hz, stereo, fltp
Stream mapping:
  Stream #0:0 -> #0:0 (mpeg2video -> libvpx)
  Stream #0:1 -> #0:1 (mp2 -> libvorbis)
Press [q] to stop, [?] for help
frame=   16 fps=0.0 q=0.0 size=     122kB time=00:00:00.56 bitrate=1764.5kbits/s    
frame=   16 fps= 16 q=0.0 size=     122kB time=00:00:00.56 bitrate=1764.5kbits/s    
frame=   30 fps= 20 q=0.0 size=     342kB time=00:00:01.63 bitrate=1715.7kbits/s    
frame=   44 fps= 22 q=0.0 size=     472kB time=00:00:02.11 bitrate=1828.6kbits/s    
frame=   59 fps= 23 q=0.0 size=     576kB time=00:00:02.62 bitrate=1796.4kbits/s    
frame=   74 fps= 24 q=0.0 size=     679kB time=00:00:03.10 bitrate=1792.2kbits/s    
frame=   92 fps= 25 q=0.0 size=     792kB time=00:00:03.70 bitrate=1752.3kbits/s    
frame=  107 fps= 26 q=0.0 size=     882kB time=00:00:04.20 bitrate=1717.8kbits/s    
frame=  125 fps= 27 q=0.0 size=     990kB time=00:00:04.80 bitrate=1687.2kbits/s    
frame=  140 fps= 27 q=0.0 size=    1086kB time=00:00:05.30 bitrate=1677.1kbits/s    
frame=  155 fps= 27 q=0.0 size=    1167kB time=00:00:05.80 bitrate=1646.9kbits/s    
frame=  170 fps= 28 q=0.0 size=    1240kB time=00:00:06.30 bitrate=1611.0kbits/s    
frame=  185 fps= 28 q=0.0 size=    1336kB time=00:00:06.80 bitrate=1607.5kbits/s    
frame=  200 fps= 28 q=0.0 size=    1431kB time=00:00:07.30 bitrate=1603.9kbits/s    
frame=  215 fps= 28 q=0.0 size=    1527kB time=00:00:07.80 bitrate=1601.7kbits/s    
frame=  229 fps= 28 q=0.0 size=    1627kB time=00:00:08.28 bitrate=1608.2kbits/s    
frame=  244 fps= 28 q=0.0 size=    1719kB time=00:00:08.77 bitrate=1604.5kbits/s    
frame=  260 fps= 28 q=0.0 size=    1815kB time=00:00:09.30 bitrate=1596.9kbits/s    
frame=  275 fps= 28 q=0.0 size=    1894kB time=00:00:09.81 bitrate=1581.9kbits/s    
frame=  287 fps= 28 q=0.0 size=    1975kB time=00:00:10.21 bitrate=1584.3kbits/s    
frame=  302 fps= 28 q=0.0 size=    2074kB time=00:00:10.71 bitrate=1586.6kbits/s    
frame=  320 fps= 29 q=0.0 size=    2177kB time=00:00:11.34 bitrate=1572.3kbits/s    
frame=  335 fps= 29 q=0.0 size=    2260kB time=00:00:11.87 bitrate=1558.8kbits/s    
frame=  350 fps= 29 q=0.0 size=    2358kB time=00:00:12.35 bitrate=1563.5kbits/s    
frame=  365 fps= 29 q=0.0 size=    2443kB time=00:00:12.85 bitrate=1557.2kbits/s    
frame=  382 fps= 29 q=0.0 size=    2520kB time=00:00:13.38 bitrate=1543.1kbits/s    
frame=  393 fps= 29 q=0.0 size=    2594kB time=00:00:13.74 bitrate=1545.6kbits/s    
frame=  412 fps= 29 q=0.0 size=    2735kB time=00:00:14.39 bitrate=1556.6kbits/s    
frame=  428 fps= 29 q=0.0 size=    2810kB time=00:00:14.91 bitrate=1543.6kbits/s    
frame=  443 fps= 29 q=0.0 size=    2928kB time=00:00:15.41 bitrate=1556.0kbits/s    
frame=  459 fps= 29 q=0.0 size=    3024kB time=00:00:15.94 bitrate=1553.2kbits/s    
frame=  474 fps= 29 q=0.0 size=    3084kB time=00:00:16.45 bitrate=1535.8kbits/s    
frame=  488 fps= 29 q=0.0 size=    3186kB time=00:00:16.91 bitrate=1542.6kbits/s    
frame=  504 fps= 29 q=0.0 size=    3268kB time=00:00:17.45 bitrate=1534.0kbits/s    
frame=  517 fps= 29 q=0.0 size=    3348kB time=00:00:17.91 bitrate=1530.9kbits/s    
frame=  532 fps= 29 q=0.0 size=    3441kB time=00:00:18.42 bitrate=1529.9kbits/s    
frame=  548 fps= 29 q=0.0 size=    3531kB time=00:00:18.93 bitrate=1527.5kbits/s    
frame=  563 fps= 29 q=0.0 size=    3608kB time=00:00:19.41 bitrate=1522.2kbits/s    
frame=  580 fps= 29 q=0.0 size=    3724kB time=00:00:19.98 bitrate=1526.5kbits/s    
frame=  596 fps= 29 q=0.0 size=    3829kB time=00:00:20.52 bitrate=1528.4kbits/s    
frame=  611 fps= 29 q=0.0 size=    3896kB time=00:00:21.02 bitrate=1518.3kbits/s    
frame=  625 fps= 29 q=0.0 size=    3995kB time=00:00:21.48 bitrate=1523.2kbits/s    
frame=  641 fps= 29 q=0.0 size=    4098kB time=00:00:22.05 bitrate=1521.7kbits/s    
frame=  655 fps= 29 q=0.0 size=    4184kB time=00:00:22.54 bitrate=1520.5kbits/s    
frame=  671 fps= 29 q=0.0 size=    4279kB time=00:00:23.02 bitrate=1522.7kbits/s    
frame=  687 fps= 29 q=0.0 size=    4348kB time=00:00:23.55 bitrate=1511.9kbits/s    
frame=  703 fps= 29 q=0.0 size=    4435kB time=00:00:24.09 bitrate=1507.9kbits/s    
frame=  717 fps= 29 q=0.0 size=    4535kB time=00:00:24.55 bitrate=1512.7kbits/s    
frame=  733 fps= 29 q=0.0 size=    4616kB time=00:00:25.09 bitrate=1507.1kbits/s    
frame=  748 fps= 29 q=0.0 size=    4719kB time=00:00:25.59 bitrate=1510.6kbits/s    
frame=  763 fps= 29 q=0.0 size=    4814kB time=00:00:26.09 bitrate=1511.3kbits/s    
frame=  777 fps= 29 q=0.0 size=    4895kB time=00:00:26.56 bitrate=1509.7kbits/s    
frame=  793 fps= 29 q=0.0 size=    4976kB time=00:00:27.09 bitrate=1504.6kbits/s    
frame=  808 fps= 29 q=0.0 size=    5070kB time=00:00:27.59 bitrate=1505.2kbits/s    
frame=  824 fps= 29 q=0.0 size=    5155kB time=00:00:28.12 bitrate=1501.3kbits/s    
frame=  838 fps= 29 q=0.0 size=    5255kB time=00:00:28.59 bitrate=1505.5kbits/s    
frame=  854 fps= 29 q=0.0 size=    5365kB time=00:00:29.12 bitrate=1508.7kbits/s    
frame=  867 fps= 29 q=0.0 size=    5447kB time=00:00:29.64 bitrate=1505.0kbits/s    
frame=  883 fps= 29 q=0.0 size=    5539kB time=00:00:30.09 bitrate=1507.6kbits/s    
frame=  897 fps= 29 q=0.0 size=    5631kB time=00:00:30.60 bitrate=1507.5kbits/s    
frame=  914 fps= 29 q=0.0 size=    5729kB time=00:00:31.13 bitrate=1507.6kbits/s    
frame=  928 fps= 29 q=0.0 size=    5803kB time=00:00:31.59 bitrate=1504.4kbits/s    
frame=  942 fps= 29 q=0.0 size=    5886kB time=00:00:32.10 bitrate=1501.7kbits/s    
frame=  960 fps= 30 q=0.0 size=    5976kB time=00:00:32.66 bitrate=1498.6kbits/s    
frame=  975 fps= 30 q=0.0 size=    6052kB time=00:00:33.16 bitrate=1494.9kbits/s    
frame=  990 fps= 30 q=0.0 size=    6124kB time=00:00:33.66 bitrate=1490.1kbits/s    
frame= 1006 fps= 30 q=0.0 size=    6203kB time=00:00:34.20 bitrate=1485.7kbits/s    
frame= 1021 fps= 30 q=0.0 size=    6291kB time=00:00:34.70 bitrate=1485.1kbits/s    
frame= 1036 fps= 30 q=0.0 size=    6370kB time=00:00:35.20 bitrate=1482.5kbits/s    
frame= 1050 fps= 30 q=0.0 size=    6457kB time=00:00:35.66 bitrate=1483.0kbits/s    
frame= 1065 fps= 30 q=0.0 size=    6571kB time=00:00:36.17 bitrate=1488.2kbits/s    
frame= 1080 fps= 30 q=0.0 size=    6661kB time=00:00:36.67 bitrate=1488.1kbits/s    
frame= 1095 fps= 30 q=0.0 size=    6768kB time=00:00:37.17 bitrate=1491.3kbits/s    
frame= 1110 fps= 30 q=0.0 size=    6858kB time=00:00:37.67 bitrate=1491.5kbits/s    
frame= 1126 fps= 30 q=0.0 size=    6954kB time=00:00:38.23 bitrate=1489.8kbits/s    
frame= 1140 fps= 30 q=0.0 size=    7044kB time=00:00:38.67 bitrate=1492.2kbits/s    
frame= 1156 fps= 30 q=0.0 size=    7141kB time=00:00:39.20 bitrate=1492.2kbits/s    
frame= 1170 fps= 30 q=0.0 size=    7239kB time=00:00:39.67 bitrate=1494.8kbits/s    
frame= 1185 fps= 30 q=0.0 size=    7342kB time=00:00:40.17 bitrate=1497.1kbits/s    
frame= 1200 fps= 30 q=0.0 size=    7440kB time=00:00:40.72 bitrate=1496.4kbits/s    
frame= 1217 fps= 30 q=0.0 size=    7508kB time=00:00:41.24 bitrate=1491.3kbits/s    
frame= 1232 fps= 30 q=0.0 size=    7589kB time=00:00:41.74 bitrate=1489.4kbits/s    
frame= 1248 fps= 30 q=0.0 size=    7682kB time=00:00:42.27 bitrate=1488.6kbits/s    
frame= 1263 fps= 30 q=0.0 size=    7774kB time=00:00:42.77 bitrate=1488.8kbits/s    
frame= 1278 fps= 30 q=0.0 size=    7857kB time=00:00:43.27 bitrate=1487.3kbits/s    
frame= 1293 fps= 30 q=0.0 size=    7939kB time=00:00:43.77 bitrate=1485.6kbits/s    
frame= 1306 fps= 30 q=0.0 size=    8028kB time=00:00:44.21 bitrate=1487.7kbits/s    
frame= 1323 fps= 30 q=0.0 size=    8113kB time=00:00:44.77 bitrate=1484.3kbits/s    
frame= 1336 fps= 30 q=0.0 size=    8238kB time=00:00:45.23 bitrate=1492.0kbits/s    
frame= 1352 fps= 30 q=0.0 size=    8323kB time=00:00:45.79 bitrate=1488.8kbits/s    
frame= 1366 fps= 30 q=0.0 size=    8391kB time=00:00:46.21 bitrate=1487.6kbits/s    
frame= 1383 fps= 30 q=0.0 size=    8478kB time=00:00:46.78 bitrate=1484.6kbits/s    
frame= 1396 fps= 30 q=0.0 size=    8569kB time=00:00:47.21 bitrate=1486.8kbits/s    
frame= 1412 fps= 30 q=0.0 size=    8657kB time=00:00:47.81 bitrate=1483.2kbits/s    
frame= 1427 fps= 30 q=0.0 size=    8746kB time=00:00:48.25 bitrate=1484.7kbits/s    
frame= 1442 fps= 30 q=0.0 size=    8836kB time=00:00:48.84 bitrate=1481.8kbits/s    
frame= 1457 fps= 30 q=0.0 size=    8918kB time=00:00:49.34 bitrate=1480.5kbits/s    
frame= 1474 fps= 30 q=0.0 size=    9006kB time=00:00:49.81 bitrate=1481.0kbits/s    
frame= 1490 fps= 30 q=0.0 size=    9119kB time=00:00:50.35 bitrate=1483.7kbits/s    
frame= 1506 fps= 30 q=0.0 size=    9197kB time=00:00:50.88 bitrate=1480.7kbits/s    
frame= 1520 fps= 30 q=0.0 size=    9292kB time=00:00:51.39 bitrate=1481.0kbits/s    
frame= 1536 fps= 30 q=0.0 size=    9371kB time=00:00:51.88 bitrate=1479.6kbits/s    
frame= 1550 fps= 30 q=0.0 size=    9466kB time=00:00:52.41 bitrate=1479.4kbits/s    
frame= 1566 fps= 30 q=0.0 size=    9562kB time=00:00:52.88 bitrate=1481.1kbits/s    
frame= 1580 fps= 30 q=0.0 size=    9641kB time=00:00:53.38 bitrate=1479.4kbits/s    
frame= 1596 fps= 30 q=0.0 size=    9739kB time=00:00:53.88 bitrate=1480.5kbits/s    
frame= 1610 fps= 30 q=0.0 size=    9828kB time=00:00:54.37 bitrate=1480.5kbits/s    
frame= 1626 fps= 30 q=0.0 size=    9925kB time=00:00:54.88 bitrate=1481.4kbits/s    
frame= 1643 fps= 30 q=0.0 size=   10017kB time=00:00:55.45 bitrate=1479.8kbits/s    
frame= 1658 fps= 30 q=0.0 size=   10117kB time=00:00:56.00 bitrate=1479.8kbits/s    
frame= 1673 fps= 30 q=0.0 size=   10200kB time=00:00:56.45 bitrate=1480.1kbits/s    
frame= 1688 fps= 30 q=0.0 size=   10301kB time=00:00:56.95 bitrate=1481.5kbits/s    
frame= 1703 fps= 30 q=0.0 size=   10364kB time=00:00:57.52 bitrate=1475.9kbits/s    
frame= 1718 fps= 30 q=0.0 size=   10453kB time=00:00:57.95 bitrate=1477.5kbits/s    
frame= 1732 fps= 30 q=0.0 size=   10525kB time=00:00:58.42 bitrate=1475.8kbits/s    
frame= 1748 fps= 30 q=0.0 size=   10628kB time=00:00:59.02 bitrate=1475.0kbits/s    
frame= 1764 fps= 30 q=0.0 size=   10706kB time=00:00:59.49 bitrate=1474.2kbits/s    
frame= 1780 fps= 30 q=0.0 size=   10826kB time=00:01:00.04 bitrate=1477.0kbits/s    
frame= 1796 fps= 30 q=0.0 size=   10905kB time=00:01:00.56 bitrate=1475.2kbits/s    
frame= 1811 fps= 30 q=0.0 size=   10998kB time=00:01:01.06 bitrate=1475.5kbits/s    
frame= 1825 fps= 30 q=0.0 size=   11083kB time=00:01:01.52 bitrate=1475.7kbits/s    
frame= 1841 fps= 30 q=0.0 size=   11170kB time=00:01:02.06 bitrate=1474.4kbits/s    
frame= 1855 fps= 30 q=0.0 size=   11264kB time=00:01:02.55 bitrate=1475.2kbits/s    
frame= 1871 fps= 30 q=0.0 size=   11353kB time=00:01:03.06 bitrate=1474.8kbits/s    
frame= 1884 fps= 30 q=0.0 size=   11435kB time=00:01:03.53 bitrate=1474.5kbits/s    
frame= 1901 fps= 30 q=0.0 size=   11531kB time=00:01:04.06 bitrate=1474.5kbits/s    
frame= 1917 fps= 30 q=0.0 size=   11634kB time=00:01:04.59 bitrate=1475.4kbits/s    
frame= 1932 fps= 30 q=0.0 size=   11719kB time=00:01:05.09 bitrate=1474.8kbits/s    
frame= 1947 fps= 30 q=0.0 size=   11809kB time=00:01:05.59 bitrate=1474.7kbits/s    
frame= 1962 fps= 30 q=0.0 size=   11900kB time=00:01:06.09 bitrate=1474.8kbits/s    
frame= 1976 fps= 30 q=0.0 size=   12016kB time=00:01:06.60 bitrate=1477.9kbits/s    
frame= 1992 fps= 30 q=0.0 size=   12101kB time=00:01:07.10 bitrate=1477.3kbits/s    
frame= 2007 fps= 30 q=0.0 size=   12182kB time=00:01:07.60 bitrate=1476.2kbits/s    
frame= 2019 fps= 30 q=0.0 size=   12265kB time=00:01:08.00 bitrate=1477.6kbits/s    
frame= 2038 fps= 30 q=0.0 size=   12374kB time=00:01:08.63 bitrate=1476.9kbits/s    
frame= 2054 fps= 30 q=0.0 size=   12478kB time=00:01:09.16 bitrate=1477.8kbits/s    
frame= 2069 fps= 30 q=0.0 size=   12578kB time=00:01:09.67 bitrate=1478.9kbits/s    
frame= 2082 fps= 30 q=0.0 size=   12650kB time=00:01:10.10 bitrate=1478.3kbits/s    
frame= 2100 fps= 30 q=0.0 size=   12774kB time=00:01:10.75 bitrate=1478.9kbits/s    
frame= 2115 fps= 30 q=0.0 size=   12844kB time=00:01:11.23 bitrate=1477.0kbits/s    
frame= 2128 fps= 30 q=0.0 size=   12919kB time=00:01:11.71 bitrate=1475.9kbits/s    
frame= 2149 fps= 30 q=0.0 size=   13053kB time=00:01:12.33 bitrate=1478.1kbits/s    
frame= 2164 fps= 30 q=0.0 size=   13121kB time=00:01:12.83 bitrate=1475.7kbits/s    
frame= 2179 fps= 30 q=0.0 size=   13278kB time=00:01:13.34 bitrate=1483.2kbits/s    
frame= 2193 fps= 30 q=0.0 size=   13344kB time=00:01:13.80 bitrate=1481.1kbits/s    
frame= 2210 fps= 30 q=0.0 size=   13434kB time=00:01:14.37 bitrate=1479.8kbits/s    
frame= 2223 fps= 30 q=0.0 size=   13531kB time=00:01:14.80 bitrate=1481.8kbits/s    
frame= 2240 fps= 30 q=0.0 size=   13616kB time=00:01:15.37 bitrate=1479.8kbits/s    
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krustyreturns

I wasn't really watching it, I just started it to try and generate a log for you.  I will do it again and this time pay attention.

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Tikuf

Ya cool. Every so often mine drops a frame due to signal and that can cause the de sync. I have the fix in mine temporarily to see how it runs. I still get minor glitches but it doesn't appear to fall out of sync yet (i have only done some short tests)

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krustyreturns

So it starts up and almost immediately there is a freeze in the video, that last for maybe a half second.  As soon as it resumes the audio is out of sync.  It happened both times I tried it.  It also happens so quickly I can't tell if audio was in sync before the freeze.

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Tikuf

Try changing <Delay_WTV2TS_MS>500</Delay_WTV2TS_MS> ffmpeg may be starving a little.

 

If that doesn't work (it wont totally solve it) I will try to get the other fix into the server asap

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krustyreturns

I'll try that (probably not tonight through).  One last test I ran just now, these posted runs were on my development machine with a tuner that is noisy (video contains noise artifacts).  I viewed the exact same channel on my family mediacenter with better tuners and didn't see the freeze or the audio sync problem.

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Tikuf

Ah yes i had a similar problem with a noisy tuner i ended up changing the source in wmc and it fixed it.

 

The fix I have in mind wont hurt so I will see what I can do.

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Sven

I have the same issue with the nextpvr module. The audio Always get out of sync with the video....

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Tikuf

I have let @@Luke know a possible fix so if we can retest after it hits the repo.

 

I will let you guys know when it is in.

 

Cheers

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allen00se

OP here, sorry I still am not back online yet... looks like you guys are making some progress without me though!

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