It has nothing to do with the form of expression of the film works, but it is related to the content, but the film works are basically adapted from literary works, and their scope is larger than that of literary works, in the larger category of culture/art (culture and art include literature).
This seemingly "1+ 1=2" problem, in fact, many people only know it, and they don't know why, so it is necessary to make it clear.
There are two concepts in the question: works and literary works. The former is a big concept, while the latter is a small concept. Big concepts contain small concepts.
Then, we must first understand the concept of "work".
Generally speaking, the finished products of literature and art are called works. In other words, works include the finished products of literary creation and artistic creation. This is of course a popular explanation.
If interpreted from the perspective of copyright law, "work" is the object of copyright, which refers to the intellectual creation achievements that are original in literature, art, science and other fields and can be copied in some tangible form. Works include written works, oral works, music, drama, folk art and dance works, as well as works of fine arts, photography, movies, television and video, as well as graphic works such as engineering design, product design drawings and their explanations, maps and schematic diagrams, and even computer software, folk literature and art works and other works stipulated by laws and administrative regulations.
Obviously, in so many kinds of intellectual creation, not all written works can be called literary works, but oral works and folk literary works can often be called literary works.
This involves the concept of "literature".
Literature is a social ideology. In ancient times, all books and documents written in words were collectively called documents. Modernity refers to the art of using language to create images to reflect social life and express the author's thoughts and feelings, so literature can also be called "language art". The language here certainly includes spoken and written language, but mainly refers to written language. During the Wei, Jin, Southern and Northern Dynasties in China, literature was divided into two categories: verse and prose. In modern times, literature is usually divided into poetry, prose, novel, drama, film and television literature, and various genres have various styles.
At this point, the definition of "literary works" comes to the fore: the finished products of artistic creation, including poems, essays, novels, dramas, film and television literature, etc., use language as a tool to shape images to reflect the objective reality of social life and express the author's thoughts and feelings.
I think our definition of "literary works" not only covers the concept of "literature", but also pays attention to two major elements:
The first is "creation". Creation is a complex mental work with obvious personality characteristics, a process of exerting keen sensibility, profound insight, rich imagination, full creativity and corresponding artistic expression skills, and the only way to produce works. Without this kind of labor and this process, it cannot be called "creation", but it is likely to be "plagiarism" and "imitation"; Its products can not be called "works", but at most "copies".
The second is "finished products". The finished product is the finished product. Unpublished literary works can only be called manuscripts, manuscripts and manuscripts, not works. Similarly, students' exercises can only be called "compositions".