There are a variety of German terms for film adaptions of various sources:
Literaturverfilmung = A work of literature adapted as a film
Comicverfilmung = A comic book adapted as a film
Videospielverfilumg = A videogame adapted as a film
However, the construct (original medium)+ Verfilmung does not work with Fernsehn:
Fernsehverfilmung = TV version of a cinema film
How can we label a cinema film that is the result of an adaption of a TV series (for example, Türkisch für Anfänger)?
One possibility I could think of is "Kinoadaption"; however, Kinoadaption does not reveal the original medium upon which the adaption is based, and it seems to be used primarily in reference to original materials (i.e. "Originalcomic zur Kinoadaption").