Speed Ramp
Variable-speed actionRalenti accéléré
Speed ramping changes playback or capture speed inside a single shot rather than holding one retiming ratio. Approach and recovery stay energetic while one motivated instant (impact, glance, turn) stretches, then the clock returns.
Narrative function
Treat it as temporal close-up. The shot walks up in real time, lands on the fact that matters, and releases.
A fight, a catch, a look across a room can all take the ramp if the event is readable. The audience should feel one continuous action, not a new clip glued on.
It is the wrong tool when the whole beat should stay slow, or when you only need a smash of magnification. If rate never returns, you shot slow motion and called it a ramp.
If the picture punches in by focal length, you wanted a crash zoom. Do not ramp to hide unreadable choreography.
How it works
Capture enough temporal detail (high frame rate) that both the fast and slow portions have samples. Identify the motivated event, then shape the acceleration curve and matching motion blur.
The body must stay mechanically continuous through the change. Prompt: Speed ramp on [Subject], real time slamming into slow motion at the impact or glance, then releasing.
When to use it
Use it to mark one instant inside a fight or a look, such as a board leaving the ramp at the peak of a jump. Do not use it on every cut or the emphasis dies.
Compared with similar shots
A ramp is not constant Slow Motion, which never returns to real time. It is not a Crash Zoom In, which changes focal length rather than the clock.
Freeze Frame holds one image. Bullet Time lets the camera orbit a nearly stopped instant instead of stretching and releasing the same viewpoint's action.
In film
300 moves combat between fast and extended slow-motion beats so selected blows become readable. Sherlock Holmes (2009) isolates anticipated fight details, then snaps back to the hit as performed.
The Matrix mixes rates around chosen impacts, though its array orbits are a different machine.
300 2006Combat moves between fast and extended slow-motion beats.
Sherlock Holmes 2009Anticipated combat details are isolated before action resumes.
Prompt it
Name the real-time approach, the stretched beat, and the recovery. Still: three readable phases implied in one pose is weaker than a video ramp.
Video: Speed ramp: real-time movement of [Subject] suddenly stretches into slow motion at the key beat, then recovers. One coherent action, readable contacts, natural gravity.
What usually goes wrong
The usual wrong cousin is wall-to-wall Slow Motion. The tell is a shot that never returns to real time, or a jump in pose at the speed change.
Fix: write approach, hold, and release, and keep the body continuous through the curve.
Questions
What is Speed Ramp in film?
A speed ramp is a change of playback or capture speed inside one shot, used to emphasize a single instant and then return.
Speed Ramp vs Slow Motion
Slow motion holds one stretched rate. A speed ramp enters that rate at a motivated event and leaves it, so approach and recovery stay fast.
When should I use Speed Ramp?
When one contact, recognition, or turn must be inspected without draining the energy of the surrounding action.
How do I prompt Speed Ramp for AI image or video?
Write real time into slow motion at a named beat, then recovery. Demand one continuous action and matching motion blur, not a cut to a different clip.
Melies can generate this Speed Ramp
Melies is the AI filmmaking workspace. This Speed Ramp opens with the motion prompt loaded, so time is a setting you generate instead of a slider you guess.