simon@SimonSimCity-Mac:~$ ffmpeg -ss 00:09:06 -to 00:09:25 -i dvd.vob -map 0:0 -c:v copy -map 0:2 -c:a copy clip1.mpeg
ffmpeg version 1.2.1 Copyright (c) 2000-2013 the FFmpeg developers
  built on Jul 16 2013 14:50:39 with Apple LLVM version 4.2 (clang-425.0.28) (based on LLVM 3.2svn)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/1.2.1 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-nonfree --enable-hardcoded-tables --enable-avresample --enable-vda --cc=cc --host-cflags= --host-ldflags= --enable-libx264 --enable-libfaac --enable-libmp3lame --enable-libxvid
  libavutil      52. 18.100 / 52. 18.100
  libavcodec     54. 92.100 / 54. 92.100
  libavformat    54. 63.104 / 54. 63.104
  libavdevice    54.  3.103 / 54.  3.103
  libavfilter     3. 42.103 /  3. 42.103
  libswscale      2.  2.100 /  2.  2.100
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  2.100 / 52.  2.100
[mpeg @ 0x7fe4ca81c400] Stream #1: not enough frames to estimate rate; consider increasing probesize
Input #0, mpeg, from 'ergo.vob':
  Duration: 01:16:25.68, start: 0.274056, bitrate: 7768 kb/s
    Stream #0:0[0x1e0]: Video: mpeg2video (Main), yuv420p, 720x576 [SAR 16:15 DAR 4:3], 25 fps, 25 tbr, 90k tbn, 50 tbc
    Stream #0:1[0x20]: Subtitle: dvd_subtitle
    Stream #0:2[0x80]: Audio: ac3, 0 channels
[mpeg @ 0x7fe4ca834600] sample rate not set
Output #0, mpeg, to 'clip1.mpeg':
    Stream #0:0: Video: mpeg2video, yuv420p, 720x576 [SAR 16:15 DAR 4:3], q=2-31, 25 fps, 90k tbn, 25 tbc
    Stream #0:1: Audio: ac3, 0 channels
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:2 -> #0:1 (copy)
Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument