wordpress htaccess is hijacking my .mp4 files

A missing mime type should not cause a 404 page but the AddType needs to be wrapped in <IfModule mod_mime.c> tags.

<IfModule mod_mime.c>
    AddType video/mp4 .mp4 .m4v
    AddType video/mpeg .mpeg .mpg .mpe
    AddType video/asf .asf .asx .wax .wmv .wmx
    AddType video/avi .avi
    AddType video/quicktime .mov .qt
    AddType audio/ogg .ogg
</IfModule>

I’m running jw player on a multisite and I had to use absolute urls to access the player and the file. I created a folder in my site root that contained the player and files then wrote a function to display the video and enqueued the swfobject using wp_enqueue_script.

 add_action( 'template_redirect', 'load_swf_object' );
 function load_swf_object() {
    wp_enqueue_script('swf_object', '/jw/swfobject.js');
}

function c3m_play_the_video() {  
 echo "<div id='front-vid'>
        <div id='videospace'>This text will be replaced</div>
        <script type="text/javascript">
      var so = new SWFObject('http://example.com/jw/player.swf','mpl','520','350','9');
      so.addParam('allowfullscreen','true');
      so.addParam('allowscriptaccess','always');
      so.addParam('wmode','opaque');
      so.addVariable('file','http://example.com/jw/video/video_name.mp4');
      so.addVariable('image','http://example.com/jw/video/video-face.jpg');
      so.addVariable('skin','http://example.com/jw/skins/glow.zip');
      so.addVariable('bufferlength','3');
      so.write('videospace');
      </script>
        </div>";
}