Mine

$ env LANG=C gst-launch-0.10 gnomevfssrc location="file://$PWD/foo.flv" ! typefind ! ffdemux_flv ! ffdec_flv ! xvimagesink
Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...
ERROR: from element /pipeline0/ffdemux_flv0: Internal data stream error.
Additional debug info:
gstffmpegdemux.c(971): gst_ffmpegdemux_loop (): /pipeline0/ffdemux_flv0:
streaming stopped, reason error
ERROR: pipeline doesn't want to preroll.
Setting pipeline to NULL ...
FREEING pipeline ...