Super Slow Motion in AI Video
Slow motion is not slowness. It's detail that only exists at speed. Pick a subject that hides something, or the shot falls flat no matter the prompt.
TL;DR
Slow motion works when the action contains detail the eye cannot catch in real time: liquid, impact, fabric, particulate. Walking or camera moves slowed down are just slow. Describe hard directional light against a dark background and macro framing, since that is the look high-speed cinematography produces. Describe what is suspended rather than asking for slowness, keep the camera still, and limit it to one event.
Slow motion is not slowness. It is detail that only exists at speed.
A person walking, played at half speed, is just a slow walk. A droplet hitting water at 1000 frames per second is a crown of liquid nobody has ever seen with their eyes. The second one is why the technique exists.
That distinction decides everything about whether a generated slow-motion shot works, because models will happily give you the first and you will not know why it feels flat.
There is no interpolation or retiming here, so this is entirely about generating footage that reads as high-speed. The mechanics of that are in creating slow motion videos; this is about making it good.
Pick a subject that hides something
The test: does this action contain detail my eye cannot catch in real time?
Things that reward it:
Liquid. Splashes, pours, droplets. Water does things at speed that look invented.
Impact and fracture. Something breaking, powder scattering, a surface deforming.
Fabric and hair. Cloth settling, a coat turning, hair moving through an arc.
Particulate. Dust, smoke, sparks, flour, confetti.
Things that do not:
Walking, turning, gesturing. Human motion at ordinary speed contains nothing hidden. Slowed, it is just slow.
Camera moves. A slow push is a slow push. Slowing it further reads as a technical error.
Anything already gentle. Slow motion on a calm scene removes the only thing it had.
If a shot fails as slow motion, the subject is usually the reason, not the prompt.
Light it like a high-speed shot
Real high-speed cinematography needs enormous light, because exposure time collapses. That constraint produced a look, and models have learned the look.
So describing the lighting gets you most of the way there:
"Hard directional light from the side, deep shadows, black background, water droplet striking a still surface, slow motion, macro."
Hard light and dark surroundings read as high-speed far more than the words "slow motion" alone.
Macro framing. Real slow-motion work is usually close. Distance loses the detail that justified the technique.
Dark backgrounds make particulate and liquid legible. Against a busy background the detail disappears.
Say what is frozen, not what is slow
A useful reframe when the prompt is not landing.
Rather than asking for slowness, describe the state you want visible: "droplets suspended mid-air", "fabric caught mid-fold", "powder hanging in the light". This gives the model a picture to make rather than a speed to apply.
Keep the camera still. A moving camera during slow motion divides attention and makes the result read as slowed-down normal footage.
One event. Slow motion stretches a moment, so a prompt containing several events gets compressed back toward normal speed to fit them all in.
Duration is not speed
Worth repeating because it catches everyone: duration controls how long the clip runs, not how fast things move inside it.
Asking for ten seconds does not slow a two-second action down. It gives the model ten seconds to fill, and it will invent more action to fill them, which is the opposite of what you wanted.
Ask for slower movement in words. Keep the duration short.
Where the real control is
For a genuinely slow, deliberate movement rather than a high-speed look, first-to-last frame on Seedance 2.0 or 2.0 Fast is the strongest option here.
Supply a start and end frame that are close together, with a longer duration. Because you have constrained the distance rather than requesting a speed, the model has no choice but to move slowly between them. That is the nearest thing to speed control available.
What is not real
No frame interpolation. No route, no model, no capability. Nothing converts 24 fps footage to 120 or 240.
No fps control at generation time.
No motion strength or speed setting. Across all 37 video generation models the parameters are prompt, duration, aspect ratio and resolution, plus references, a negative prompt or first and last frames on some.
No per-model slow-motion ranking. Tables scoring models on slow-mo quality invented the column.
If you have existing footage to slow down, that is an editing job, and shooting at a high frame rate in the first place beats any post-processing.
The short version
Choose a subject with hidden detail. Light it hard against dark. Frame it close. Describe what is suspended rather than what is slow. Hold the camera still, and keep it to one event.
Start in Text to Video, or image to video from a still. The catalog is at Models, and each generation is quoted before it runs.
Frequently Asked Questions
Why does my slow motion clip look flat?▾
Usually the subject. Slow motion works when the action contains detail invisible at normal speed, such as liquid, impact, fabric or particulate. Human motion like walking or gesturing contains nothing hidden, so slowed down it is simply slow. If a shot fails, the subject is more often the cause than the prompt.
How do I make a generated clip read as high-speed footage?▾
Describe the lighting. Real high-speed cinematography needs enormous light, which produced a recognisable look of hard directional light and deep shadows, usually against a dark background and framed close. Those descriptions get you further than the words "slow motion" alone.
Does asking for a longer duration slow the action down?▾
No. Duration controls how long the clip runs, not how fast things move within it. Requesting ten seconds gives the model ten seconds to fill and it will invent more action to fill them, which is the opposite of the intent. Ask for slower movement in words and keep the duration short.
What is a better way to phrase a slow-motion prompt?▾
Describe the state you want visible rather than the speed: "droplets suspended mid-air", "fabric caught mid-fold", "powder hanging in the light". That gives the model a picture to make rather than a speed to apply. Keep the camera still, since a moving camera makes the result read as slowed-down normal footage.
Can I convert existing footage to 120 or 240 fps?▾
Not here. There is no frame interpolation, no retiming and no fps control anywhere on the platform. Slowing existing footage is an editing job, and shooting at a high frame rate in the first place beats any post-processing.
What gives the most control over slow movement?▾
First-to-last frame on Seedance 2.0 or 2.0 Fast. Supply start and end frames that are close together with a longer duration, and the model has no choice but to move slowly between them, because you constrained the distance rather than requesting a speed.
Which model is best for slow motion?▾
There is no published ranking, and tables scoring models on slow-motion quality invented the column. Slow motion is a look produced by the prompt rather than a model capability, so subject choice and lighting description matter far more than which model you pick.
