Hi yes, ffmpeg-php is installed! (Also, I tried three other packages that use ffmpeg-php) and they all work as well.
I tried the 'thumb.php' test and here is the result:

Code:
Before - ffmpeg_movie(1.wmv)

Fatal error: Class 'ffmpeg_movie' not found in /home/xxxxxxxx/public_html/thumb.php on line 8"
Again, ffmpeg-php is installed and working for other youtube-type applications. Maybe the issue is where or how the 'ffmpeg_movie' class is defined?