How to use Migrate module to import Videos?
I had to migrate a few thousand flv and mp4 videos. I ended up just migrating the file name into a field, uploading the videos files to s3 and then using a custom node.tpl.php to render the player:

&lt;?php
  //display legacy videos
  $mediaid = $content['field_mediaid']['#items'][0]['value'];
  if ($mediaid != '') {
      $video2 = '&lt;a href="http://mydomain.s3.amazonaws.com/videos/ka/'.$mediaid.'.mp4" id="player" class="flowplayer"&gt;&lt;/a&gt;';
              flowplayer_add('#player', array(
                'clip' =&gt; array(
                  'autoPlay' =&gt; TRUE
                ),
              )); 
        print $video2;
 }
 //hide the mediaid field from display
 hide($content['field_mediaid']);
?&gt;


Not very elegant but it got the job done. I used migrate 7.x-2.2 back then, maybe 2.5 has better video and/or file import features.