Advance video scripting

Dear Developers We are looking for developer to modify our video scripting servers to support video conversion between multiple video formats For example : .MTS --> .MP4/MOV Kindly state a short description on how can this be done, what kind of platform are you using, or is it build from the sketch. Just pre-note here, we're particularly serious on time frame, and are looking for long term working relationship, as i am sure we need the same developer to upgrade our site in future, hence let me know your best budget and time frame for this project to be complete. If your offer is attractive enough, you might be the lucky one.