Here is Amits post that has some info
http://www.labnol.org/internet/video/flash-video-editing-guide-split-flv-extract-mp3-music/2488/
there are couple of ways of dealing with flv.
One option is to use some encoder like SUPER( http://www.erightsoft.com/SUPER.html ) or anyvideoconvertor( http://www.any-video-converter.com/products/for_video_free/ ) that you can use to convert "flv" to "mpeg" or "avi" format and once you have it as avi or mpeg you can use any video editor like windows movie maker or Pinnacle's Video Spin for editing.
Another option is to try online video editors
http://www.jumpcut.com/
the site lets you upload flv and edit flv and add titles and effects. Only problem is that you can't download the finished product to your desktop but you can get the code to embed it
I hope this helps
Anurag
Member
In case you like to edit FLV files, I suggest using RichFLV - it can do all the basic editing tasks. (see review)
Alternatively, if you want to add text titles to an FLV video, convert the FLV video to something like WMV or AVI - import the video into Premiere Pro and use the Title editor.
FLV can be converted to other formats using SUPER freeware.
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