I was trying another plugin also. This is what I got from Flowplayer support:
ttp://wordpress.org/support/plugin/flowplayer5
Is it possible to use this plugin to play .flv files?
>>>
no. It's purely aimed at html5 video so far. Since the plugin's "send to editor" depends function depends on a video being previewable in html5 mode, you're our of luck with flv here.
You could still directly embed flv by putting somehting like
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.8/jquery.min.js"></script>
<script src="http://releases.flowplayer.org/5.4.1/flowplayer.min.js"></script>
<link rel="stylesheet" type="text/css" href="http://releases.flowplayer.org/5.4.1/skin/minimalist.css" />
<div style="max-width: 624px;" class="flowplayer"><video><source src="http://some.domain.org/bla.flv" type="video/flash"></video></div>
in the textarea editor.
I guess
Regards,
flowplayer support