conversion ffmpeg de fichiers flv

florian@florian-laptop:~$ ffmpeg -ab 96k -b 600k -i "get_video.flv" -f mpeg "marianas.mpg"
FFmpeg version CVS, Copyright (c) 2000-2004 Fabrice Bellard
  configuration:  --prefix=/usr --libdir=${prefix}/lib --incdir=${prefix}/include/ffmpeg --enable-shared --enable-mp3lame --enable-gpl --enable-faad --mandir=${prefix}/share/man --enable-vorbis --enable-pthreads --enable-faac --enable-xvid --enable-dts --enable-amr_nb --enable-amr_wb --enable-pp --enable-libogg --enable-theora --enable-libgsm --enable-x264 --enable-a52 --enable-a52bin --extra-cflags=-Wall -g -fPIC -DPIC 
  libavutil version: 49.0.0
  libavcodec version: 51.9.0
  libavformat version: 50.4.0
  built on Jun 19 2006 21:30:06, gcc: 4.0.3 (Ubuntu 4.0.3-1ubuntu5)
get_video.flv: I/O error occured
Usually that means that input file is truncated and/or corrupted.