I found a solution that had more to do with the fact that ffmpeg wasn't auto-detecting the size of my videos. I edited line 14 in ray\modules\movie\inc\constants.inc.php

Changed this
if(!defined("VIDEO_SIZE")) define("VIDEO_SIZE", "350x250");

to this
if(!defined("VIDEO_SIZE")) define("VIDEO_SIZE", "640x480");

This,combined with the following post, got me exactly what I was looking for:
http://www.boonex.org/2007/11/22/audio-and-video-size/

This see more probably isn't helpful in your case but I wanted to share my solution.