Its very simple. You should put a space beteween embed & src. It has to look like this:
<embed src="http://www.jeroenwijering.com/embed/player.swf"width="720"height="324"allowscriptaccess="always"allowfullscreen="true"flashvars="height=324&width=720&file=http://x264.servebeer.com/550.mp4&searchbar=false&smoothing=false"/>
And NOT like that:
<embedsrc="http://www.jeroenwijering.com/embed/player.swf"width="720"height="324"allowscriptaccess="always"allowfullscreen="true"flashvars="height=324&width=720&file=http://x264.servebeer.com/550.mp4&searchbar=false&smoothing=false"/>
Deactivate...