High frame rate

In motion picture technology—either film or video—high frame rate (HFR) refers to higher frame rates than typical prior practice.

The frame rate for motion picture film cameras was typically 24 frames per second (fps) with multiple flashes on each frame during projection to prevent flicker. Analog television and video employed interlacing where only half of the image (known as a video field) was recorded and played back/refreshed at once but at twice the rate of what would be allowed for progressive video of the same bandwidth, resulting in smoother playback, as opposed to progressive video which is more similar to how celluloid works. The field rate of analog television and video systems was typically 50 or 60 fields per second. Usage of frame rates higher than 24 FPS for feature motion pictures and higher than 30 FPS for other applications are emerging trends in the 21st century.

In early cinema history, there was no standard frame rate established. Edison's early films were shot at 40 fps, while the Lumière Brothers used 16 fps. This had to do with a combination of the use of a hand crank rather than a motor, which created variable frame rates because of the inconsistency of the cranking of the film through the camera. After the introduction of synch sound recording, 24 fps became the industry standard frame rate for capture and projection of motion pictures. 24 fps was chosen because it was the minimum frame rate that would produce adequate sound quality. This was done because film was expensive, and using the lowest possible frame rate would use the least amount of film.

A few film formats have experimented with frame rates higher than the 24 fps standard. The original 3-strip Cinerama features of the 1950s ran at 26 fps. The first two Todd-AO 70mm features, Oklahoma! (1955) and Around the World in 80 Days (1956) were shot and projected at 30 fps.Douglas Trumbull's 70mm Showscan film format operated at 60 fps.

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