mp4 video file won't upload?

[eluser]newbie boy[/eluser]
since like i had set-up all necessary things needed to upload an mp4 video file... like...

for the mimes.php in the configuration, i added this...

Code:

'mp4'   =>  'video/mp4'

for the .htaccess, i put this...

Code:

AddType video/mp4 .mp4

on my upload controller i got this...

Code:

$config['allowed_types']     = 'mp4';

but still everytime i upload a mp4 video file, this is still the error...

The file type you are attempting to upload is not allowed.

appreciate the help guys...

thanks...