video.js can play FLV in Flash technology.
If you are using video.js hosting and not using CDN, make sure the path to your swf is correct, for example
<script>
videojs.options.flash.swf = "http://example.com/path/to/video-js.swf"
</script>
Verify that the correct video/x-flvmime type is used in the source tag :
<source src="http://example.com/video.flv" type='video/x-flv'>
, FLV, mime Content-Type.
: http://output.jsbin.com/juvuca