automatic video uploading app

I need a script / an app that will do automatic video uploading to different video websites (like youtube, vimeo etc.). For Mac! The user has to fill-in the required info-fields (username, password, title, description, tags etc.) for each of the upload-sites and should be able to start an upload by clicking a button for each site. The sites to upload to have to be modificatable (does that word exist?) by the user, so it's a flexible script (in order to add more sites or if changes to the sites occur). Documentation in order to understand the editing-process (to add more sites) has to be provided.