When I try and view some video files on my TV via mezzmo: LG TV (2015 models)
The TV reports the message "unable to play" file and Mezzmo does not attempt to pre-transcode the file.
Additionally, If I manually transcode the file via the mezzmo server ui, the TV is still unable to play the file.

Here is the ffmpeg infor for the file.
Note the line near the end
<MEZZMO>: Child process ended with code: 109, ExitCode=1

Code:
ffmpeg version N-90389-g247cdc2 Copyright (c) 2000-2018 the FFmpeg developers
  built with gcc 4.9.2 (GCC)
  configuration: --arch=x86_64 --target-os=mingw32 --cross-prefix=x86_64-w64-mingw32- --enable-static --disable-shared --enable-zlib --disable-postproc --prefix=/home/peter/ffmpeg/build/gpl64 --enable-libmp3lame --enable-libx264 --enable-gpl --extra-libs='-lx264 -lpthread -lstdc++' --enable-runtime-cpudetect --extra-cflags=-I/home/peter/cc32/include --extra-ldflags=-L/home/peter/cc64/lib --pkg-config=pkg-config --pkg-config-flags=--static --disable-w32threads --enable-libvpx --enable-libvorbis --enable-libtheora --enable-libx265 --enable-cuda --enable-cuvid --enable-dxva2 --enable-libmfx --enable-nvenc --enable-gnutls --extra-libs='-lz -lnettle -lhogweed -lgmp -lidn -lws2_32 -lcrypt32'
  libavutil      56. 11.100 / 56. 11.100
  libavcodec     58. 14.100 / 58. 14.100
  libavformat    58. 10.100 / 58. 10.100
  libavdevice    58.  2.100 / 58.  2.100
  libavfilter     7. 13.100 /  7. 13.100
  libswscale      5.  0.102 /  5.  0.102
  libswresample   3.  0.101 /  3.  0.101
Input #0, matroska,webm, from 'E:\Park.720p.HEVC.x265-MeGusta.mkv':
  Metadata:
    ENCODER         : Lavf58.30.100
  Duration: 00:27:16.80, start: 0.000000, bitrate: 508 kb/s
    Stream #0:0: Video: hevc (Main 10), yuv420p10le(tv), 1280x720 [SAR 1:1 DAR 16:9], 25 fps, 25 tbr, 1k tbn, 25 tbc (default)
    Metadata:
      BPS-eng         : 1896105
      DURATION-eng    : 00:27:16.800000000
      NUMBER_OF_FRAMES-eng: 40920
      NUMBER_OF_BYTES-eng: 387943179
      _STATISTICS_WRITING_APP-eng: mkvmerge v47.0.0 ('Black Flag') 64-bit
      _STATISTICS_WRITING_DATE_UTC-eng: 2020-10-19 20:19:03
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
      ENCODER         : Lavc58.55.100 libx265
      DURATION        : 00:27:16.800000000
    Stream #0:1(eng): Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s
    Metadata:
      BPS-eng         : 192000
      DURATION-eng    : 00:27:16.800000000
      NUMBER_OF_FRAMES-eng: 51150
      NUMBER_OF_BYTES-eng: 39283200
      _STATISTICS_WRITING_APP-eng: mkvmerge v47.0.0 ('Black Flag') 64-bit
      _STATISTICS_WRITING_DATE_UTC-eng: 2020-10-19 20:19:03
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
      DURATION        : 00:27:16.800000000
At least one output file must be specified

<MEZZMO>: Child process ended with code: 109, ExitCode=1


---> DB Level Info: 93, 2
---> Frame rate: 25.00
---> Aspect ratio: 16:9 PAR=1:1
---> Duration: 00:27:16