Slow Motion

Slow motion is a cinematographic technique in which footage is recorded at a higher frame rate than the playback rate, causing the action to appear to unfold more slowly than it occurred in reality when played back at standard speed. A 120fps recording played at 24fps produces a 5x slow-motion effect, stretching one real second of action across five seconds of screen time.

Slow motion is created by recording at a higher frame rate than the intended playback rate. A camera recording at 120fps captures five times more frames per second than standard 24fps playback. When those 120 frames are played back at 24fps, each real second of action is displayed as five seconds of footage: a 5x slow-motion effect. Higher capture frame rates produce greater slow-motion multipliers.

Slow motion plays back footage at a reduced speed, so action continues to unfold but more slowly than in reality. Freeze frame stops the footage entirely at a specific moment, holding a single frame as a static image for a defined duration. Slow motion is temporal stretching; freeze frame is temporal suspension. Both are used at moments of dramatic significance, but slow motion maintains the sense of continuing action while freeze frame completely arrests time.

Speed ramping (or ramping) is a technique that continuously transitions between different playback speeds within a single shot: typically moving from normal speed into slow motion at a specific moment, or from slow motion back to normal speed. The transition is smooth rather than abrupt, creating a flowing temporal shift. Speed ramping is widely used in commercial, music video, and action filmmaking to emphasise specific moments through selective temporal expansion while maintaining narrative flow at normal speed.

The frame rate needed depends on the desired slow-motion multiplier: for 2x slow motion at 24fps playback, record at 48fps. For 5x at 24fps, record at 120fps. For 10x at 24fps, record at 240fps. For very high slow-motion multipliers (40x and beyond), specialist high-speed cameras recording at 960fps, 2000fps, or higher are required. Most modern smartphones support 120fps; professional broadcast cameras offer 240–480fps; specialist scientific cameras achieve far higher rates.

Slow motion has an inherently aesthetic quality for several reasons: the smoothness of high-frame-rate playback creates fluid, graceful movement free of the normal jerkiness of fast action; the additional motion blur per frame at high capture rates softens and beautifies movement; and the temporal expansion itself transforms familiar fast events into extended, contemplative experiences that reveal beauty and complexity invisible at normal speed. The combination of technical quality, revealed detail, and temporal transformation creates the characteristic aesthetic power of slow motion.

Overcranking is the traditional film production term for shooting at a higher frame rate than the standard 24fps: derived from the era of hand-cranked film cameras, where cranking the camera faster than normal resulted in slow-motion playback. Its opposite, undercranking (shooting slower than normal), produces time-lapse or fast-motion effects. Despite the mechanical origins, the terms are still used in contemporary film production to describe high-frame-rate and low-frame-rate shooting respectively.

AI video generation cannot directly produce true high-frame-rate footage in the traditional sense, since it does not involve actual camera capture. However, AI models can generate video content with the visual aesthetics of slow motion: smooth, fluid movement, motion blur characteristics appropriate to high-frame-rate capture, and temporal pacing that suggests slowed time. Some AI video platforms also offer playback speed controls or time-stretch post-processing. For true high-frame-rate slow motion, conventional camera capture remains the production standard.