./ffmpeg -vd /dev/dv1394/0 -grab dv1394 http://localhost:8090/feed1.ffm
FFmpeg version SVN-r6214, Copyright (c) 2000-2004 Fabrice Bellard
  configuration:  --enable-dc1394 --enable-mp3lame --enable-libogg --enable-vorbis 
  libavutil version: 49.0.0
  libavcodec version: 51.14.0
  libavformat version: 50.5.0
  built on Sep  9 2006 23:16:04, gcc: 4.0.1 (4.0.1-5mdk for Mandriva Linux release 2006.0)
Failed to initialize DV interface: Invalid argument
: I/O error occured
Usually that means that input file is truncated and/or corrupted.