ffmpeg version 3.4.11-0ubuntu0.1 Copyright (c) 2000-2022 the FFmpeg developers
  built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04)
  configuration: --prefix=/usr --extra-version=0ubuntu0.1 --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
Input #0, rawvideo, from '/home/user/ffmpeg-3.4.11/debian/standard/tests/data/vsynth_lena.yuv':
  Duration: N/A, bitrate: 6082 kb/s
    Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 352x288, 6082 kb/s, 5 tbr, 5 tbn, 5 tbc
fate-suite//sub/vobsub.idx: could not seek to position 132.000
Input #1, vobsub, from 'fate-suite//sub/vobsub.idx':
  Duration: N/A, bitrate: N/A
    Stream #1:0[0x0](en): Subtitle: dvd_subtitle, 720x480 (default)
Codec AVOption threads (set the number of threads) specified for input file #1 (fate-suite//sub/vobsub.idx) 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 decoder which was not actually used for any stream.
Codec AVOption thread_type (select multithreading type) specified for input file #1 (fate-suite//sub/vobsub.idx) 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 decoder which was not actually used for any stream.
Stream mapping:
  Stream #0:0 (rawvideo) -> scale
  Stream #1:0 (dvdsub) -> overlay:overlay
  overlay -> Stream #0:0 (rawvideo)
  Stream #1:0 -> #0:1 (dvd_subtitle (dvdsub) -> dvd_subtitle (dvdsub))
Segmentation fault (core dumped)