download videos from sites like YouTube

The project is for modifying an existing source code of a program that can download videos from web sites. The idea is to add methods for downloading videos from sites that are not actually supported by the program. The list of sites will be provided once the winner bid is chosen (list contains about 35 sites). I will also provide source code and examples of how this task is already done for sites like YouTube, DailyMotion, Yahoo and some other video sites so the developer can use that info for creating the methods for non-supported sites.