Intentaste, para el segundo video, hacerlo así?:
Código:
<div id="flvplayer2"></div>
<script type="text/javascript">
var so = new SWFObject("mpw_player.swf", "swfplayer", "400", "327", "9", "#000000");
so.addVariable("flv", "video.flv");
so.addVariable("jpg","imagen.jpg");
//so.addVariable("autoplay","true");
so.addParam("allowFullScreen","true");
so.write("flvplayer2");
</script>