There is a FLV splitter available. One of them is Gabest and can be found on sourceforge:
http://sourceforge.net/project/showf...kage_id=183318
or here:
http://www.videohelp.com/tools?tool=FLV_Splitter
LE: The package contains Gabest splitter. Though, after installing and downloading a file from internet I wasn't able to play the file. It's recognised as an audio file, but even so, it's not correctly played.