FFmpeg error

ffmpeg version 3.4.2 Copyright (c) 2000-2018 the FFmpeg developers
  built with gcc 6.3.0 (crosstool-NG crosstool-ng-1.23.0)
  configuration: --enable-cross-compile --cross-prefix=x86_64-pc-linux-gnu- --cc=x86_64-pc-linux-gnu-gcc --cxx=x86_64-pc-linux-gnu-gcc --arch=x86_64 --prefix=/srv/buildbot/x64/ffmpeg-x64/staging --pkg-config=pkg-config --disable-cuda --disable-cuvid --disable-iconv --disable-nvenc --disable-doc --disable-ffplay --disable-ffserver --disable-xlib --enable-fontconfig --enable-gpl --enable-libass --enable-libfreetype --enable-libfribidi --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libwebp --enable-libx264 --enable-libzvbi --enable-version3 --extra-libs='-ldl -lexpat -lfreetype -lfribidi -lfontconfig -lpng -lgmp -lhogweed -lnettle -laddns-samba4 -lasn1util-samba4 -lauthkrb5-samba4 -lCHARSET3-samba4 -lcliauth-samba4 -lcli-cldap-samba4 -lcli-ldap-common-samba4 -lcli-nbt-samba4 -lcli-smb-common-samba4 -lcom_err -lcommon-auth-samba4 -ldbwrap-samba4 -ldcerpc-binding -ldcerpc-samba-samba4 -lflag-mapping-samba4 -lgenrand-samba4 -lgensec-samba4 -lgse-samba4 -lgssapi_krb5 -llibcli-lsa3-samba4 -llibsmb-samba4 -linterfaces-samba4 -liov-buf-samba4 -lk5crypto -lkrb5 -lkrb5samba-samba4 -lkrb5support -lldb -lldbsamba-samba4 -lmessages-dgm-samba4 -lmessages-util-samba4 -lmsghdr-samba4 -lmsrpc3-samba4 -lndr -lndr-krb5pac -lndr-nbt -lndr-samba-samba4 -lndr-standard -lreplace-samba4 -lsamba-cluster-support-samba4 -lsamba-credentials -lsamba-debug-samba4 -lsamba-errors -lsamba-hostconfig -lsamba-modules-samba4 -lsamba-security-samba4 -lsamba-sockets-samba4 -lsamba-util -lsamba3-util-samba4 -lsamdb -lsamdb-common-samba4 -lsecrets3-samba4 -lserver-id-db-samba4 -lserver-role-samba4 -lsmbconf -lsmbd-shim-samba4 -lsmb-transport-samba4 -lsocket-blocking-samba4 -lsys-rw-samba4 -ltalloc -ltalloc-report-samba4 -ltdb -ltdb-wrap-samba4 -ltevent -ltevent-util -ltime-basic-samba4 -lutil-cmdline-samba4 -lutil-reg-samba4 -lutil-setid-samba4 -lutil-tdb-samba4 -lwbclient -lwinbind-client-samba4 -ldrm' --target-os=linux --enable-shared --disable-static --enable-gnutls --enable-libsmbclient --enable-vaapi
  WARNING: library configuration mismatch
  avutil      configuration: --prefix=/usr --extra-version='1~16.04.york0.2' --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
  avcodec     configuration: --prefix=/usr --extra-version='1~16.04.york0.2' --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
  avformat    configuration: --prefix=/usr --extra-version='1~16.04.york0.2' --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
  avdevice    configuration: --prefix=/usr --extra-version='1~16.04.york0.2' --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
  avfilter    configuration: --prefix=/usr --extra-version='1~16.04.york0.2' --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
  swscale     configuration: --prefix=/usr --extra-version='1~16.04.york0.2' --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
  swresample  configuration: --prefix=/usr --extra-version='1~16.04.york0.2' --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
  postproc    configuration: --prefix=/usr --extra-version='1~16.04.york0.2' --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
  libswscale      4.  8.100 /  4.  8.100
  libswresample   2.  9.100 /  2.  9.100
  libpostproc    54.  7.100 / 54.  7.100
libva info: VA-API version 0.39.4
libva info: va_getDriverName() returns 0
libva info: Trying to open /usr/lib/x86_64-linux-gnu/dri/gallium_drv_video.so
libva info: Found init function __vaDriverInit_0_39
libva info: va_openDriver() returns 0
Input #0, matroska,webm, from '/home/matthew/media/TV/House/Season 5/House.S05E15.Unfaithful.mkv':
  Metadata:
    title           : House, M.D. - S05E15 - Unfaithful
    CREATION_TIME   : 
    ENCODER         : Lavf55.12.0
  Duration: 00:43:57.20, start: 0.000000, bitrate: 1094 kb/s
    Chapter #0:0: start 0.000000, end 182.015000
    Metadata:
      title           : Chapter 1
    Chapter #0:1: start 182.098000, end 702.076000
    Metadata:
      title           : Chapter 2
    Chapter #0:2: start 702.159000, end 1160.993000
    Metadata:
      title           : Chapter 3
    Chapter #0:3: start 1161.076000, end 1650.357000
    Metadata:
      title           : Chapter 4
    Chapter #0:4: start 1650.440000, end 2596.427000
    Metadata:
      title           : Chapter 5
    Chapter #0:5: start 2596.510000, end 2637.093000
    Metadata:
      title           : Chapter 6
    Stream #0:0: Video: hevc (Main), yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 1k tbn, 23.98 tbc (default)
    Metadata:
      BPS             : 900392
      BPS-eng         : 900392
      DURATION        : 00:43:57.093000000
      DURATION-eng    : 00:43:57.093000000
      NUMBER_OF_FRAMES: 63227
      NUMBER_OF_FRAMES-eng: 63227
      NUMBER_OF_BYTES : 296802344
      NUMBER_OF_BYTES-eng: 296802344
      _STATISTICS_WRITING_APP: mkvmerge v8.0.0 ('Til The Day That I Die') 64bit
      _STATISTICS_WRITING_APP-eng: mkvmerge v8.0.0 ('Til The Day That I Die') 64bit
      _STATISTICS_WRITING_DATE_UTC: 2015-10-08 02:28:32
      _STATISTICS_WRITING_DATE_UTC-eng: 2015-10-08 02:28:32
      _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: aac (HE-AAC), 48000 Hz, 5.1, fltp (default)
    Metadata:
      title           : Surround
      LANGUAGE        : eng
      BPS             : 191999
      BPS-eng         : 191999
      DURATION        : 00:43:57.099000000
      DURATION-eng    : 00:43:57.099000000
      NUMBER_OF_FRAMES: 61807
      NUMBER_OF_FRAMES-eng: 61807
      NUMBER_OF_BYTES : 63290369
      NUMBER_OF_BYTES-eng: 63290369
      _STATISTICS_WRITING_APP: mkvmerge v8.0.0 ('Til The Day That I Die') 64bit
      _STATISTICS_WRITING_APP-eng: mkvmerge v8.0.0 ('Til The Day That I Die') 64bit
      _STATISTICS_WRITING_DATE_UTC: 2015-10-08 02:28:32
      _STATISTICS_WRITING_DATE_UTC-eng: 2015-10-08 02:28:32
      _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    Stream #0:2(eng): Subtitle: subrip
    Metadata:
      BPS             : 91
      BPS-eng         : 91
      DURATION        : 00:41:58.516000000
      DURATION-eng    : 00:41:58.516000000
      NUMBER_OF_FRAMES: 771
      NUMBER_OF_FRAMES-eng: 771
      NUMBER_OF_BYTES : 28656
      NUMBER_OF_BYTES-eng: 28656
      _STATISTICS_WRITING_APP: mkvmerge v8.0.0 ('Til The Day That I Die') 64bit
      _STATISTICS_WRITING_APP-eng: mkvmerge v8.0.0 ('Til The Day That I Die') 64bit
      _STATISTICS_WRITING_DATE_UTC: 2015-10-08 02:28:32
      _STATISTICS_WRITING_DATE_UTC-eng: 2015-10-08 02:28:32
      _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
Codec AVOption crf (Select the quality for constant quality mode) specified for output file #0 (/home/matthew/media/TV/House/Season 5/House.S05E15.Unfaithful.mp) has not been used for any stream. The most likely reason is either wrong type (e.g. a video option with no video streams) or that it is a private option of some encoder which was not actually used for any stream.
Stream mapping:
  Stream #0:0 -> #0:0 (hevc (native) -> h264 (h264_vaapi))
  Stream #0:1 -> #0:1 (aac (native) -> ac3 (native))
Press [q] to stop, [?] for help
[h264_vaapi @ 0xa5cda0] Encoding entrypoint not found (7 / 6).
Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
Conversion failed!