Can anyone tell me what this error means when I try to upload a video Please ?

Fatal error: Class 'ffmpeg_movie' not found in /home/sexytran/public_html/sexy-she-males.com/media/include/classes/class.video_duration.php on line 60

Also can you tell me why I cannot embed as Admin under the heading Add FLV/Embed
It keeps on saying : 'You must specify image for video'
And I have added an image from my desktop.

Any help would be appreciated

Mike