ffmpeg -i my_mxf.mxf
ffmpeg version N-42806-gf4451d2 Copyright (c) 2000-2012 the FFmpeg developers
  built on Jul 23 2012 09:08:50 with gcc 4.5.2 (GCC) (x86_64.generic.Komisar)
  configuration: --enable-gpl --enable-version3 --enable-nonfree --disable-hwaccels
--disable-doc --enable-runtime-cpudetect --extra-cflags=-U__STRICT_ANSI__
--extra-cflags=-DPTW32_STATIC_LIB --prefix=/home/vodenc1/software/win64
--cross-prefix=x86_64-pc-mingw32- --cpu=x86_64 --arch=x86_64 --target-os=mingw32
--enable-avisynth --enable-libfaac --enable-libx264 --enable-libmp3lame --enable-libopencore-amrnb
--enable-libopencore-amrwb
  libavutil      51. 65.100 / 51. 65.100
  libavcodec     54. 44.100 / 54. 44.100
  libavformat    54. 19.100 / 54. 19.100
  libavdevice    54.  2.100 / 54.  2.100
  libavfilter     3.  3.100 /  3.  3.100
  libswscale      2.  1.100 /  2.  1.100
  libswresample   0. 15.100 /  0. 15.100
  libpostproc    52.  0.100 / 52.  0.100
[mxf @ 000000000038F3E0] found essence prior to first PartitionPack
my_mxf.mxf: Invalid data found when processing input