flash video codecs

Project:Tools
Component:Documentation
Category:task
Priority:normal
Assigned:Unassigned
Status:active
Project wiki:Tools of the trade
Description

following my own tutorial in the wiki:
http://overshoot.tv/node/72
I find many videos with the FourCC FLV1 (coder flv).
So I guess flv represents at least one kind of coder used in Flash Videos. But which is it?
I cannot find a reference of a flv codec.