# ffmpeg -i /opt/sagetv/server/x.mkv
ffmpeg version 2.8.11-0ubuntu0.16.04.1 Copyright (c) 2000-2017 the FFmpeg developers
  built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.4) 20160609
  configuration: --prefix=/usr --extra-version=0ubuntu0.16.04.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --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, from '/opt/sagetv/server/x.mkv':
  Metadata:
    encoder         : libebml v1.3.6 + libmatroska v1.4.9
    creation_time   : 2019-01-23 07:06:09
  Duration: 00:41:09.43, start: 0.000000, bitrate: 3119 kb/s
    Stream #0:0: Video: h264 (High), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc (default)
    Metadata:
      BPS-eng         : 2991760
      DURATION-eng    : 00:41:09.342000000
      NUMBER_OF_FRAMES-eng: 59205
      NUMBER_OF_BYTES-eng: 923459833
      _STATISTICS_WRITING_APP-eng: mkvmerge v29.0.0 ('Like It Or Not') 64-bit
      _STATISTICS_WRITING_DATE_UTC-eng: 2019-01-23 07:06:09
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    Stream #0:1: Audio: aac (LC), 48000 Hz, stereo, fltp (default)
    Metadata:
      BPS-eng         : 125375
      DURATION-eng    : 00:41:09.397000000
      NUMBER_OF_FRAMES-eng: 115753
      NUMBER_OF_BYTES-eng: 38700087
      _STATISTICS_WRITING_APP-eng: mkvmerge v29.0.0 ('Like It Or Not') 64-bit
      _STATISTICS_WRITING_DATE_UTC-eng: 2019-01-23 07:06:09
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    Stream #0:2(eng): Subtitle: subrip
    Metadata:
      BPS-eng         : 315
      DURATION-eng    : 00:40:28.393000000
      NUMBER_OF_FRAMES-eng: 987
      NUMBER_OF_BYTES-eng: 95736
      _STATISTICS_WRITING_APP-eng: mkvmerge v29.0.0 ('Like It Or Not') 64-bit
      _STATISTICS_WRITING_DATE_UTC-eng: 2019-01-23 07:06:09
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
At least one output file must be specified