Please tell me what is a teaser, what is a trailer, and what is the difference between the two? Be specific.

The trailers are generally not included in the movie. There are usually some mistakes in the original material, which are very funny. The trailer is a preview of a movie, some climax shots!

Cinematography, a movie is a continuous frame, one after another appearing on the screen, and the audience adds additional images based on these frames. With the help of dialogue (or narration) and sound effects, the illusion of "visual persistence" of the entire continuous frame is grasped. According to the ratio of the speed of light and the speed of sound, the speed of these continuous frames is twenty-four frames per second.

Film photography is usually carried out according to the needs of the plot. First of all, the subject matter and shooting must be determined by its theme expression and audience target.

If it is a literary film, the style of light and shadow should be soft and elegant, and the camera movement rate should change slowly according to the subject's position, with a poetic sense of depth and rhythm. In martial arts films, the action is fast and intense, close-ups and short shots are often used, the contrast between light and shadow is as obvious as possible, the tonal contrast should be strong, and the expressions of strength and beauty are depicted everywhere.

For biopics, the picture composition should be stable; light, shadow, color and sound effects should have atmospheric effects to portray the characters, things and problems in the play. For monster films (including ghost films), each shot is corrected with light color paper or filters as necessary, plus special makeup and set props to create a sci-fi magical effect and increase the horror atmosphere.

In musicals, the camera movement should be relaxed and lively; the framing of movements such as tilting, tilting, panning, following, pushing, and pulling are all designed to express the rhythmic beauty of the subject and to express the cheerfulness of the camera movement.

Before filming a movie, the cinematographer should meet with the director, lighting engineer, set decorator and special effects technician. (Including makeup artists) coordinate first, divide work and cooperate. Everyone should study the content and central concept of the script in detail, and then discuss and suggest improvements together before filming. Originally quoted from "Film Photography", anthology of Wang Aijun's essays by the International Junyou Association.