The mediainfo change log indicate there were some Matroska fixes in more recent versions so getting the most resent version in ubuntu might fix it. I'd have to look up how to make a sample to send... I can't find compile instructions to verify it's a mediainfo regression and not a packaging one. For now I'm using ffprobe which has the following output to compare: > mediainfo --Version MediaInfo Command line, MediaInfoLib - v0.7.82 > ffprobe -version ffprobe version 2.8.6-1ubuntu2 Copyright (c) 2007-2016 the FFmpeg developers built with gcc 5.3.1 (Ubuntu/Linaro 5.3.1-11ubuntu1) 20160311 configuration: --prefix=/usr --extra-version=1ubuntu2 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/arm-linux-gnueabihf --incdir=/usr/include/arm-linux-gnueabihf --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --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-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --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-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv libavutil 54. 31.100 / 54. 31.100 libavcodec 56. 60.100 / 56. 60.100 libavformat 56. 40.101 / 56. 40.101 libavdevice 56. 4.100 / 56. 4.100 libavfilter 5. 40.101 / 5. 40.101 libavresample 2. 1. 0 / 2. 1. 0 libswscale 3. 1.101 / 3. 1.101 libswresample 1. 2.101 / 1. 2.101 libpostproc 53. 3.100 / 53. 3.100 > mediainfo $F > ffprobe "$F" 2>&1 | perl -pe 's/from .*://g' ffprobe version 2.8.6-1ubuntu2 Copyright (c) 2007-2016 the FFmpeg developers built with gcc 5.3.1 (Ubuntu/Linaro 5.3.1-11ubuntu1) 20160311 configuration: --prefix=/usr --extra-version=1ubuntu2 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/arm-linux-gnueabihf --incdir=/usr/include/arm-linux-gnueabihf --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --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-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --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-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv libavutil 54. 31.100 / 54. 31.100 libavcodec 56. 60.100 / 56. 60.100 libavformat 56. 40.101 / 56. 40.101 libavdevice 56. 4.100 / 56. 4.100 libavfilter 5. 40.101 / 5. 40.101 libavresample 2. 1. 0 / 2. 1. 0 libswscale 3. 1.101 / 3. 1.101 libswresample 1. 2.101 / 1. 2.101 libpostproc 53. 3.100 / 53. 3.100 Input #0, matroska,webm, Metadata: encoder : libebml v1.3.3 + libmatroska v1.4.4 creation_time : 2016-07-08 08:46:21 Duration: 03:02:33.65, start: 0.000000, bitrate: 3606 kb/s Chapter #0:0: start 0.000000, end 610.651000 Metadata: title : Chapter 01 Chapter #0:1: start 610.651000, end 1620.619000 Metadata: title : Chapter 02 Chapter #0:2: start 1620.619000, end 2269.183000 Metadata: title : Chapter 03 Chapter #0:3: start 2269.183000, end 2814.269000 Metadata: title : Chapter 04 Chapter #0:4: start 2814.269000, end 3724.929000 Metadata: title : Chapter 05 Chapter #0:5: start 3724.929000, end 4450.571000 Metadata: title : Chapter 06 Chapter #0:6: start 4450.571000, end 5286.906000 Metadata: title : Chapter 07 Chapter #0:7: start 5286.906000, end 6106.350000 Metadata: title : Chapter 08 Chapter #0:8: start 6106.350000, end 6832.450000 Metadata: title : Chapter 09 Chapter #0:9: start 6832.450000, end 7378.037000 Metadata: title : Chapter 10 Chapter #0:10: start 7378.037000, end 8103.804000 Metadata: title : Chapter 11 Chapter #0:11: start 8103.804000, end 8874.866000 Metadata: title : Chapter 12 Chapter #0:12: start 8874.866000, end 9411.151000 Metadata: title : Chapter 13 Chapter #0:13: start 9411.151000, end 10107.347000 Metadata: title : Chapter 14 Chapter #0:14: start 10107.347000, end 10483.639000 Metadata: title : Chapter 15 Chapter #0:15: start 10483.639000, end 10953.654000 Metadata: title : Chapter 16 Stream #0:0(eng): Video: h264 (High), yuv420p, 1920x800 [SAR 1:1 DAR 12:5], 23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc (default) Metadata: BPS : 2849872 BPS-eng : 2849872 DURATION : 03:02:33.651000000 DURATION-eng : 03:02:33.651000000 NUMBER_OF_FRAMES: 262625 NUMBER_OF_FRAMES-eng: 262625 NUMBER_OF_BYTES : 3902063897 NUMBER_OF_BYTES-eng: 3902063897 _STATISTICS_WRITING_APP: mkvmerge v8.5.2 ('Crosses') 32bit _STATISTICS_WRITING_APP-eng: mkvmerge v8.5.2 ('Crosses') 32bit _STATISTICS_WRITING_DATE_UTC: 2016-07-08 08:46:21 _STATISTICS_WRITING_DATE_UTC-eng: 2016-07-08 08:46:21 _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES Stream #0:1(eng): Audio: dts (DTS), 48000 Hz, 5.1(side), fltp, 768 kb/s (default) Metadata: BPS : 754499 BPS-eng : 754499 DURATION : 03:02:33.654000000 DURATION-eng : 03:02:33.654000000 NUMBER_OF_FRAMES: 1026905 NUMBER_OF_FRAMES-eng: 1026905 NUMBER_OF_BYTES : 1033066430 NUMBER_OF_BYTES-eng: 1033066430 _STATISTICS_WRITING_APP: mkvmerge v8.5.2 ('Crosses') 32bit _STATISTICS_WRITING_APP-eng: mkvmerge v8.5.2 ('Crosses') 32bit _STATISTICS_WRITING_DATE_UTC: 2016-07-08 08:46:21 _STATISTICS_WRITING_DATE_UTC-eng: 2016-07-08 08:46:21 _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES