The convert command is


Code:
/usr/local/bin/ffmpeg -i /var/www/vhosts/profilespark.com/httpdocs/video/5.avi -acodec mp3 -ar 22050 -ab 32 -f flv /var/www/vhosts/profilespark.com/httpdocs/flvideo/5.flv
Try running this on the server. If ffmpeg is properly installed, you should see converted video file at

/var/www/vhosts/profilespark.com/httpdocs/flvideo/5.flv

It seems you have problem with the requirements installation.