codeigniter video upload

[eluser]PHP Programmer[/eluser]
I am trying to upload a video file ie .avi, .mpeg formats and want to convert them in .flv format.
I have put the following code in mime.php:
AddType video/x-flv .flv
AddType video/mp4 .mp4

But my code didn't work....

Is there any code available to do the video uploading and converting into .flv format in CodeIgniter? Please suggest.

TIA