No option to play in original quality

Server Version#: 1.13.9.5456
Player Version#: latest LG and Web

When I attempt to play a particular video on either the web player or the WebOS version of the Plex player for LG, Plex always transcodes it and never allows it to be played in “original quality”. PMS is on the same subnet as the devices on which I’ve attempted playing the video and connected by 1Gbps cables.

I should note that other videos can be played in original quality and the issue I’m having affects a particular video.

Screenshot_2018-11-17_12-28-06

The video itself has the following format: hevc (Main 10), yuv420p10le(tv, bt2020nc/bt2020/smpte2084), 3840x2160 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 1k tbn, 23.98 tbc

Extra info extracted by ffmpeg:

ffmpeg version 3.4.4-0ubuntu0.18.04.1 Copyright (c) 2000-2018 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
[matroska,webm @ 0x5631508d2760] Could not find codec parameters for stream 4 (Subtitle: hdmv_pgs_subtitle (pgssub)): unspecified size
Consider increasing the value for the 'analyzeduration' and 'probesize' options
[matroska,webm @ 0x5631508d2760] Could not find codec parameters for stream 5 (Subtitle: hdmv_pgs_subtitle (pgssub)): unspecified size
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Input #0, matroska,webm, from '../film/THE_VIDEO/THE_VIDEO.mkv':
  Metadata:
    encoder         : libebml v1.3.5 + libmatroska v1.4.8
    creation_time   : 2018-03-16T17:12:57.000000Z
  Duration: 02:31:51.71, start: 0.000000, bitrate: 50582 kb/s
    Chapter #0:0: start 0.000000, end 18.643000
    Metadata:
      title           : Chapter 1
    Chapter #0:1: start 18.643000, end 105.730000
    Metadata:
      title           : Chapter 2
    Chapter #0:2: start 105.730000, end 191.816000
    Metadata:
      title           : Chapter 3
    Chapter #0:3: start 191.816000, end 463.296000
    Metadata:
      title           : Chapter 4
    Chapter #0:4: start 463.296000, end 768.434000
    Metadata:
      title           : Chapter 5
    Chapter #0:5: start 768.434000, end 824.573000
    Metadata:
      title           : Chapter 6
    Chapter #0:6: start 824.573000, end 989.279000
    Metadata:
      title           : Chapter 7
    Chapter #0:7: start 989.279000, end 1199.281000
    Metadata:
      title           : Chapter 8
    Chapter #0:8: start 1199.281000, end 1371.369000
    Metadata:
      title           : Chapter 9
    Chapter #0:9: start 1371.369000, end 1564.980000
    Metadata:
      title           : Chapter 10
    Chapter #0:10: start 1564.980000, end 1642.849000
    Metadata:
      title           : Chapter 11
    Chapter #0:11: start 1642.849000, end 1884.757000
    Metadata:
      title           : Chapter 12
    Chapter #0:12: start 1884.757000, end 1974.681000
    Metadata:
      title           : Chapter 13
    Chapter #0:13: start 1974.681000, end 2127.667000
    Metadata:
      title           : Chapter 14
    Chapter #0:14: start 2127.667000, end 2291.497000
    Metadata:
      title           : Chapter 15
    Chapter #0:15: start 2291.497000, end 2513.427000
    Metadata:
      title           : Chapter 16
    Chapter #0:16: start 2513.427000, end 2669.541000
    Metadata:
      title           : Chapter 17
    Chapter #0:17: start 2669.541000, end 2811.475000
    Metadata:
      title           : Chapter 18
    Chapter #0:18: start 2811.475000, end 3101.932000
    Metadata:
      title           : Chapter 19
    Chapter #0:19: start 3101.932000, end 3230.060000
    Metadata:
      title           : Chapter 20
    Chapter #0:20: start 3230.060000, end 3341.504000
    Metadata:
      title           : Chapter 21
    Chapter #0:21: start 3341.504000, end 3459.581000
    Metadata:
      title           : Chapter 22
    Chapter #0:22: start 3459.581000, end 3556.636000
    Metadata:
      title           : Chapter 23
    Chapter #0:23: start 3556.636000, end 3725.847000
    Metadata:
      title           : Chapter 24
    Chapter #0:24: start 3725.847000, end 3787.700000
    Metadata:
      title           : Chapter 25
    Chapter #0:25: start 3787.700000, end 3941.729000
    Metadata:
      title           : Chapter 26
    Chapter #0:26: start 3941.729000, end 4023.477000
    Metadata:
      title           : Chapter 27
    Chapter #0:27: start 4023.477000, end 4225.721000
    Metadata:
      title           : Chapter 28
    Chapter #0:28: start 4225.721000, end 4410.322000
    Metadata:
      title           : Chapter 29
    Chapter #0:29: start 4410.322000, end 4663.450000
    Metadata:
      title           : Chapter 30
    Chapter #0:30: start 4663.450000, end 4853.056000
    Metadata:
      title           : Chapter 31
    Chapter #0:31: start 4853.056000, end 5057.969000
    Metadata:
      title           : Chapter 32
    Chapter #0:32: start 5057.969000, end 5183.219000
    Metadata:
      title           : Chapter 33
    Chapter #0:33: start 5183.219000, end 5279.524000
    Metadata:
      title           : Chapter 34
    Chapter #0:34: start 5279.524000, end 5449.360000
    Metadata:
      title           : Chapter 35
    Chapter #0:35: start 5449.360000, end 5574.568000
    Metadata:
      title           : Chapter 36
    Chapter #0:36: start 5574.568000, end 5753.706000
    Metadata:
      title           : Chapter 37
    Chapter #0:37: start 5753.706000, end 5830.616000
    Metadata:
      title           : Chapter 38
    Chapter #0:38: start 5830.616000, end 5952.863000
    Metadata:
      title           : Chapter 39
    Chapter #0:39: start 5952.863000, end 6127.663000
    Metadata:
      title           : Chapter 40
    Chapter #0:40: start 6127.663000, end 6303.714000
    Metadata:
      title           : Chapter 41
    Chapter #0:41: start 6303.714000, end 6575.694000
    Metadata:
      title           : Chapter 42
    Chapter #0:42: start 6575.694000, end 6740.608000
    Metadata:
      title           : Chapter 43
    Chapter #0:43: start 6740.608000, end 6964.749000
    Metadata:
      title           : Chapter 44
    Chapter #0:44: start 6964.749000, end 7132.083000
    Metadata:
      title           : Chapter 45
    Chapter #0:45: start 7132.083000, end 7391.133000
    Metadata:
      title           : Chapter 46
    Chapter #0:46: start 7391.133000, end 7599.758000
    Metadata:
      title           : Chapter 47
    Chapter #0:47: start 7599.758000, end 7903.604000
    Metadata:
      title           : Chapter 48
    Chapter #0:48: start 7903.604000, end 8112.103000
    Metadata:
      title           : Chapter 49
    Chapter #0:49: start 8112.103000, end 8416.699000
    Metadata:
      title           : Chapter 50
    Chapter #0:50: start 8416.699000, end 8619.694000
    Metadata:
      title           : Chapter 51
    Chapter #0:51: start 8619.694000, end 9111.711000
    Metadata:
      title           : Chapter 52
    Stream #0:0: Video: hevc (Main 10), yuv420p10le(tv, bt2020nc/bt2020/smpte2084), 3840x2160 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 1k tbn, 23.98 tbc (default)
    Metadata:
      BPS-eng         : 45913506
      DURATION-eng    : 02:31:51.695000000
      NUMBER_OF_FRAMES-eng: 218462
      NUMBER_OF_BYTES-eng: 52293733337
      _STATISTICS_WRITING_APP-eng: mkvmerge v21.0.0 ('Tardigrades Will Inherit The Earth') 64-bit
      _STATISTICS_WRITING_DATE_UTC-eng: 2018-03-16 17:12:57
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    Stream #0:1(eng): Audio: truehd, 48000 Hz, 7.1, s32 (24 bit) (default)
    Metadata:
      BPS-eng         : 3941380
      DURATION-eng    : 02:31:51.663000000
      NUMBER_OF_FRAMES-eng: 10933986
      NUMBER_OF_BYTES-eng: 4489066120
      _STATISTICS_WRITING_APP-eng: mkvmerge v21.0.0 ('Tardigrades Will Inherit The Earth') 64-bit
      _STATISTICS_WRITING_DATE_UTC-eng: 2018-03-16 17:12:57
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    Stream #0:2(eng): Audio: ac3, 48000 Hz, 5.1(side), fltp, 640 kb/s
    Metadata:
      BPS-eng         : 640000
      DURATION-eng    : 02:31:51.680000000
      NUMBER_OF_FRAMES-eng: 284740
      NUMBER_OF_BYTES-eng: 728934400
      _STATISTICS_WRITING_APP-eng: mkvmerge v21.0.0 ('Tardigrades Will Inherit The Earth') 64-bit
      _STATISTICS_WRITING_DATE_UTC-eng: 2018-03-16 17:12:57
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    Stream #0:3(rum): Subtitle: subrip (default)
    Metadata:
      BPS-eng         : 43
      DURATION-eng    : 02:23:34.826000000
      NUMBER_OF_FRAMES-eng: 1595
      NUMBER_OF_BYTES-eng: 46333
      _STATISTICS_WRITING_APP-eng: mkvmerge v21.0.0 ('Tardigrades Will Inherit The Earth') 64-bit
      _STATISTICS_WRITING_DATE_UTC-eng: 2018-03-16 17:12:57
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    Stream #0:4(eng): Subtitle: hdmv_pgs_subtitle
    Metadata:
      BPS-eng         : 30863
      DURATION-eng    : 02:23:23.020000000
      NUMBER_OF_FRAMES-eng: 3796
      NUMBER_OF_BYTES-eng: 33189478
      _STATISTICS_WRITING_APP-eng: mkvmerge v21.0.0 ('Tardigrades Will Inherit The Earth') 64-bit
      _STATISTICS_WRITING_DATE_UTC-eng: 2018-03-16 17:12:57
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    Stream #0:5(spa): Subtitle: hdmv_pgs_subtitle
    Metadata:
      BPS-eng         : 25741
      DURATION-eng    : 02:22:40.561000000
      NUMBER_OF_FRAMES-eng: 3182
      NUMBER_OF_BYTES-eng: 27545633
      _STATISTICS_WRITING_APP-eng: mkvmerge v21.0.0 ('Tardigrades Will Inherit The Earth') 64-bit
      _STATISTICS_WRITING_DATE_UTC-eng: 2018-03-16 17:12:57
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES

The web app will always trigger transcoding of HEVC video, simply because no web browser out there has support for this codec.
Double so if you activate one of the subtitles, which are in PGS format, which is not understand by many player engines.

Something similar may apply to the LG app which only direct plays HEVC video if it is not HDR (i.e. 8 bit color) and is stored in a mp4 container. But I don’t know this player not well enough to know for sure.

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