> ffmpeg.exe -f lavfi -i "movie=test.mpg[out0+subcc]" -map s output.srt

ffmpeg version N-71209-gd759844 Copyright (c) 2000-2015 the FFmpeg developers
  built with gcc 4.9.2 (GCC)
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfi
g --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --
enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libm
p3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --en
able-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --ena
ble-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enabl
e-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lzma --enable-decklink --enable-zlib
  libavutil      54. 22.100 / 54. 22.100
  libavcodec     56. 32.100 / 56. 32.100
  libavformat    56. 27.100 / 56. 27.100
  libavdevice    56.  4.100 / 56.  4.100
  libavfilter     5. 13.101 /  5. 13.101
  libswscale      3.  1.101 /  3.  1.101
  libswresample   1.  1.100 /  1.  1.100
  libpostproc    53.  3.100 / 53.  3.100
Input #0, lavfi, from 'movie=test.mpg[out0+subcc]':
  Duration: N/A, start: 0.300911, bitrate: N/A
    Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 720x480 [SAR 1:1 DAR 3:2], 29.97 fps, 29.97 tbr, 90k tbn,
 90k tbc
    Stream #0:1: Subtitle: eia_608
File 'output.srt' already exists. Overwrite ? [y/N] y
Output #0, srt, to 'output.srt':
  Metadata:
    encoder         : Lavf56.27.100
    Stream #0:0: Subtitle: subrip (srt)
    Metadata:
      encoder         : Lavc56.32.100 srt
Stream mapping:
  Stream #0:1 -> #0:0 (eia_608 (cc_dec) -> subrip (srt))
Press [q] to stop, [?] for help
size=       0kB time=00:00:02.20 bitrate=   0.9kbits/s
video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 68.000000%