ffmpeg version 0.8.6, Copyright (c) 2000-2011 the FFmpeg developers
  built on Nov 19 2011 02:37:12 with gcc 4.6.2
  configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64 --mandir=/usr/share/man --enable-shared --cc=x86_64-pc-linux-gnu-gcc --disable-optimizations --disable-static --enable-gpl --enable-postproc --enable-avfilter --disable-stripping --disable-debug --disable-doc --disable-network --disable-vaapi --disable-vdpau --disable-zlib --disable-bzlib --disable-ffplay --disable-encoders --disable-indev=v4l --disable-indev=v4l2 --disable-indev=alsa --disable-indev=oss --disable-indev=jack --disable-outdev=alsa --disable-outdev=oss --disable-amd3dnow --disable-amd3dnowext --disable-altivec --disable-avx --disable-mmx --disable-mmx2 --disable-ssse3 --cpu=core2
  libavutil    51.  9. 1 / 51.  9. 1
  libavcodec   53.  7. 0 / 53.  7. 0
  libavformat  53.  4. 0 / 53.  4. 0
  libavdevice  53.  1. 1 / 53.  1. 1
  libavfilter   2. 23. 0 /  2. 23. 0
  libswscale    2.  0. 0 /  2.  0. 0
  libpostproc  51.  2. 0 / 51.  2. 0

Seems stream 0 codec frame rate differs from container frame rate: 50.00 (50/1) -> 25.00 (50/2)
Input #0, mpeg, from 'vts_01_0.vob':
  Duration: N/A, start: 0.287267, bitrate: N/A
    Stream #0.0[0x1e0]: Video: mpeg2video (Main), yuv420p, 720x576 [PAR 64:45 DAR 16:9], 8000 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
    Stream #0.1[0x20]: Subtitle: dvdsub
    Stream #0.2[0x21]: Subtitle: dvdsub
WARNING: The bitrate parameter is set too low. It takes bits/s as argument, not kbits/s
Output #0, mp3, to 'test.mp3':
Output file #0 does not contain any stream