ffmpeg -txt_format bitmap -txt_chop_top 0 -txt_page 100 -i Star\ Trek.m2t -map 0:0 -t 30 -y -v verbose ./bitmaps/t%04d.bmp
ffmpeg version 3.4.4 Copyright (c) 2000-2018 the FFmpeg developers
  built with gcc 7 (SUSE Linux)
  configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64 --incdir=/usr/include/ffmpeg --extra-cflags='-fmessage-length=0 -grecord-gcc-switches -O2 -Wall -D_FORTIFY_SOURCE=2 -fstack-protector-strong -funwind-tables -fasynchronous-unwind-tables -fstack-clash-protection -g' --optflags='-fmessage-length=0 -grecord-gcc-switches -O2 -Wall -D_FORTIFY_SOURCE=2 -fstack-protector-strong -funwind-tables -fasynchronous-unwind-tables -fstack-clash-protection -g' --disable-htmlpages --enable-pic --disable-stripping --enable-shared --disable-static --enable-gpl --disable-openssl --enable-avresample --enable-libcdio --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libcelt --enable-libcdio --enable-libdc1394 --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libzimg --enable-libzvbi --enable-vaapi --enable-vdpau --enable-libx264 --enable-libx265 --enable-libxvid
  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
[mpegts @ 0x55ba34918080] parser not found for codec dvb_teletext, packets or times may be invalid.
[libzvbi_teletextdec @ 0x55ba3491c620] page filter: 100
[mpegts @ 0x55ba34918080] parser not found for codec dvb_teletext, packets or times may be invalid.
[libzvbi_teletextdec @ 0x55ba3491c620] page filter: *
[mpeg2video @ 0x55ba3491d680] Invalid frame dimensions 0x0.
    Last message repeated 10 times
[mpegts @ 0x55ba34918080] max_analyze_duration 5000000 reached at 5000011 microseconds st:0
[mpegts @ 0x55ba34918080] PES packet size mismatch
    Last message repeated 2 times
Input #0, mpegts, from 'Star Trek.m2t':
  Duration: 02:39:34.88, start: 35931.138033, bitrate: 3742 kb/s
  Program 17501
    Stream #0:0[0x21](deu,deu): Subtitle: dvb_teletext ([6][0][0][0] / 0x0006), 492x250
    Stream #0:1[0x1ff]: Video: mpeg2video (Main), 1 reference frame ([2][0][0][0] / 0x0002), yuv420p(tv, top first, left), 720x576 [SAR 64:45 DAR 16:9], 25 fps, 25 tbr, 90k tbn, 50 tbc
    Stream #0:2[0x200](deu): Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, s16p, 192 kb/s (clean effects)
    Stream #0:3[0x203](deu): Audio: ac3 ([6][0][0][0] / 0x0006), 48000 Hz, 5.1(side), fltp, 384 kb/s (clean effects)
Automatic encoder selection failed for output stream #0:0. Default encoder for format image2 (codec none) is probably disabled or this build of ffmpeg does not include that codec. Please choose an encoder manually.
Error selecting an encoder for stream 0:0