Some video files can't be transcoded

Server Version#: 1.18.7.2415
Player Version#: Plex Web 4.24.2

NOTE: I used Plex Web to test both locally and remotely, though my observations indicate that the problem is unrelated to client platform.

In my Movies library, I have over 100 videos that originate from VHS tapes that I recorded to digital media years ago. Some of these videos refuse to play when viewing from a remote client. When I try to play, I can see the very first frame of the video in the player, but it freezes with the orange spinner, and never progresses no matter how long I wait.

This problem doesn’t occur when playing the same file from a client on the same network as the server. I suspect it is a transcoding issue. Logs provided. I have been able to reproduce the problem with a 90 second trimmed-down version of one of the movies. This 58MB video can also be provided if requested.

Plex Media Server Logs_2020-02-14_06-05-15.zip (26.4 MB)

Here is ffprobe output for one of the files affected:

$ ffprobe 20\,000\ Leagues\ Under\ the\ Sea\ \(1954\).mkv 
ffprobe version 3.4.6-0ubuntu0.18.04.1 Copyright (c) 2007-2019 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
Input #0, matroska,webm, from '20,000 Leagues Under the Sea (1954).mkv':
  Metadata:
    ENCODER         : Lavf56.36.100
  Duration: 02:07:25.14, start: 0.000000, bitrate: 3388 kb/s
    Stream #0:0: Video: h264 (High), yuv420p(progressive), 692x462 [SAR 154:173 DAR 4:3], 23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc (default)
    Metadata:
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
      BPS             : 9992376
      BPS-eng         : 9992376
      DURATION        : 02:07:25.138000000
      DURATION-eng    : 02:07:25.138000000
      NUMBER_OF_FRAMES: 183300
      NUMBER_OF_FRAMES-eng: 183300
      NUMBER_OF_BYTES : 9549137461
      NUMBER_OF_BYTES-eng: 9549137461
      _STATISTICS_WRITING_APP: mkvmerge v8.2.0 ('World of Adventure') 64bit
      _STATISTICS_WRITING_APP-eng: mkvmerge v8.2.0 ('World of Adventure') 64bit
      _STATISTICS_WRITING_DATE_UTC: 2016-01-29 14:14:34
      _STATISTICS_WRITING_DATE_UTC-eng: 2016-01-29 14:14:34
      _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
      ENCODER         : Lavc56.41.100 libx264
    Stream #0:1: Audio: mp2, 48000 Hz, stereo, s16p, 384 kb/s (default)
    Metadata:
      BPS             : 384000
      BPS-eng         : 384000
      DURATION        : 02:07:24.960000000
      DURATION-eng    : 02:07:24.960000000
      NUMBER_OF_FRAMES: 318540
      NUMBER_OF_FRAMES-eng: 318540
      NUMBER_OF_BYTES : 366958080
      NUMBER_OF_BYTES-eng: 366958080
      _STATISTICS_WRITING_APP: mkvmerge v8.2.0 ('World of Adventure') 64bit
      _STATISTICS_WRITING_APP-eng: mkvmerge v8.2.0 ('World of Adventure') 64bit
      _STATISTICS_WRITING_DATE_UTC: 2016-01-29 14:14:34
      _STATISTICS_WRITING_DATE_UTC-eng: 2016-01-29 14:14:34
      _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    Stream #0:2: Subtitle: subrip (default)
    Metadata:
      BPS             : 67
      BPS-eng         : 67
      DURATION        : 02:04:30.462000000
      DURATION-eng    : 02:04:30.462000000
      NUMBER_OF_FRAMES: 1284
      NUMBER_OF_FRAMES-eng: 1284
      NUMBER_OF_BYTES : 63207
      NUMBER_OF_BYTES-eng: 63207
      _STATISTICS_WRITING_APP: mkvmerge v8.2.0 ('World of Adventure') 64bit
      _STATISTICS_WRITING_APP-eng: mkvmerge v8.2.0 ('World of Adventure') 64bit
      _STATISTICS_WRITING_DATE_UTC: 2016-01-29 14:14:34
      _STATISTICS_WRITING_DATE_UTC-eng: 2016-01-29 14:14:34
      _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES

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