Can I keep a person's face this way?

We have not tested it with a face in frame, so we do not promise it. In an earlier test with a whole person in the shot, the person was redrawn along with the place.

How long can my clip be?

Three to ten seconds. For a longer film, change one shot at a time and cut them back together.

Why not use the Miroge form?

The form changes one object and keeps everything else, including the background and the light. That is the right job for a prop swap and the wrong one for a new location.

Will the new place keep the layout of the old one?

No. The subject holds; the world around it is invented fresh. If the shape of the place matters, describe it in the change, and expect to run it more than once.

Guides / Video editing

Keep the subject, change the world around it

You have a clip you like. The move is right and the timing is right, but it happened in the wrong place. Miroge can keep what moves in the frame and redraw everything around it. The trick is the order you describe things in.

9 min read
September 22, 2026
Preset: Miroge: recast your clip

Your clip

The edit

Side by side

What you make, in order. Tap one to jump to its step.

This guide follows one clip from start to finish: a skater's feet in a concrete bowl, turned into the same feet on an arctic glacier. Every clip and still here is real output from our models, and the numbers come from comparing each edit with its source frame by frame.

One thing to know first: the source clips in this guide were made on NOLGIA too, with Seedance 2.0 Fast, so we could test on footage we own. We have not yet run this test on footage shot on a camera.

Pick a clip where the subject has no face in frame

The technique works on a partial subject: hands, feet and legs, a vehicle, a product. It is the part of the frame you want to keep exactly as it moved. Everything else, the ground, the walls, the sky and the light, is what you will replace.

Use a clip of 3 to 10 seconds. For a longer film, change one shot at a time.

Low angle, feet only: white sneakers and black jeans on a black skateboard crossing a concrete skatepark bowl in warm evening light — **The source clip.** Five seconds, feet and legs only, made with Seedance 2.0 Fast.

Watch for this:Faces and whole bodies are not tested. Every run behind this guide kept a subject with no face in frame. In an earlier location swap with a whole person in the shot, the person was redrawn along with the place. Until we have measured it, keep faces out of this technique.

Open Miroge in New world

Miroge has three modes. Swap changes one object and keeps everything else, which is the wrong tool here: you want to keep one thing and change everything else. That is New world, and it runs on Gemini Omni 1.1 (Video Edit) unless you pick another model.

Open Miroge and pick New world.
Add your clip.
Type the subject into What stays and the new place into The new world, as the next two steps show. Miroge writes the rest of the prompt around them in the order that held: keep the subject exactly, keep the camera, then the change.

The skate clip

The skate clip: feet on a skateboard in a concrete bowl, 5 secondsMP4 video · 1280x720 · 2.7 MBDownload

Or start from these exact files and settings, already loaded.Use this example

Use this example opens New world with this clip loaded, the rider in What stays and a sandstone canyon as the new world. Replace the canyon with the glacier from step 4 to repeat this guide's edit.

The model page shows what it accepts and what it costs: Gemini Omni 1.1 (Video Edit).

Name what stays first, as a rule

Every run in this guide that held used the same order. The prompt opens by naming the subject that must survive, in concrete physical detail, then forbids changing it, and only then names what changes.

Say what changes and what does not, in one line. "Change the board and the world around it, but not the rider."
Describe the subject like a costume department would. Garments, colours, materials, how it stands, what it is touching.
Turn it into a prohibition. "Do not change the rider, their clothes, their stance or their movement in any way."
Lock the camera. The same move, angle, framing, cuts and length.

The part that protects the rider

Edit this clip and change the board and the world around it, but not the rider. KEEP THE RIDER EXACTLY AS THEY ARE: the same legs, the same black jeans, the same white sneakers, standing the same way on the board, performing exactly the same trick with exactly the same timing, the same body position frame for frame. Do not change the rider, their clothes, their stance or their movement in any way. Keep the same camera move, the same low tracking angle, the same framing and cuts, the same length.

Tip:In New world, this is the What stays line. Type only the subject, in the same concrete detail: "the rider: the same legs, the same black jeans, the same white sneakers, standing the same way on the board". Miroge adds the prohibition and the camera lock for you.

Tip:Name what is visible, not what is implied. Describe the parts the camera can see. There is no skater in this frame, only legs, so the prompt says "the same black jeans, the same white sneakers".

Then name the changes, one at a time

Only after the subject is protected, list what changes. Number them, give each its material, colour and shape, and finish with the light, because new light is what sells a new place.

In New world, the numbered changes and the light go into The new world. The prompt below is the whole instruction as it was sent for this edit.

The whole prompt for this edit

Edit this clip and change the board and the world around it, but not the rider. KEEP THE RIDER EXACTLY AS THEY ARE: the same legs, the same black jeans, the same white sneakers, standing the same way on the board, performing exactly the same trick with exactly the same timing, the same body position frame for frame. Do not change the rider, their clothes, their stance or their movement in any way. Keep the same camera move, the same low tracking angle, the same framing and cuts, the same length. THE FIRST CHANGE: the skateboard under the rider's sneakers becomes a board of clear carved blue glacier ice, frosted and translucent, with pale icy wheels. THE SECOND CHANGE: the smooth concrete skatepark bowl becomes a curved bowl of polished glacier ice on an arctic glacier, walls of blue-white ice, drifting snow, pale cold daylight and a distant ridge of ice under an overcast polar sky. The warm golden light becomes cold blue-white light. No on-screen text, no watermark, no brand names, no logos.

The same sneakers and black jeans riding a board of clear blue ice across a glacier under a pale overcast sky — **Made with Gemini Omni 1.1 (Video Edit)**, the prompt above, one run.

Source frame at 2.2 seconds: sneakers on a black skateboard in a concrete bowl — The same moment, 2.2 seconds in. Drag the line: the legs, jeans and sneakers sit where they were; the board, the ground and the light are new.

Edited frame at 2.2 seconds: the same sneakers on a board of blue ice on a glacier — The same moment, 2.2 seconds in. Drag the line: the legs, jeans and sneakers sit where they were; the board, the ground and the light are new.

Check it against your source

Play the two together and watch the subject, not the scenery. Does it sit in the same place at the same moment? Does it move with the same timing? Ignore the colour of the subject: you asked for new light, so it will look different.

The source clip above and the glacier edit below, playing in sync — **Source above, edit below**, playing together.

We measured it the same way on every run. An off-the-shelf segmenter cut the subject out of 12 frames of the source and 12 of the edit, and we compared the two outlines. On this run they overlapped at 0.93 (1.00 is identical). The same test between two unrelated clips scores 0.00 to 0.17, so a pass here means something.

What did not work: changing only the board

Our first two takes used Miroge's Swap mode: change the board, keep everything else. They did exactly that. The rider held and the board became a walnut longboard, then a teal cruiser. But the bowl, the light and the mood were untouched, so the result read as a filter. It did not look like we had done much.

The weak take: the same concrete bowl and warm light, with a walnut longboard under the sneakers — The same moment from both takes. The weak one changed one object, as Swap promises.

The kept take: the same sneakers on a board of ice on a glacier in cold light — The same moment from both takes. The weak one changed one object, as Swap promises.

The prompt for the weak take

Edit this clip and change one thing only. THE TARGET: the plain black skateboard under the rider's white sneakers. THE NEW OBJECT: a long walnut wood longboard with a natural grain finish and translucent amber wheels. Replace the target with the new object at the same position and scale, moving exactly as the target moved, with matching shadows and reflections. Keep everything else the same: the same people with the same faces, hair and clothes, the same background, the same camera move, framing and cuts, the same lighting and colour, nothing else added or removed. No on-screen text, no watermark. Use only the brand names, logos and trademarks the customer includes in their request; never add real-world brands, logos or trademarked designs the customer did not mention.

The lesson is in the second half of that prompt: it tells the model to keep the background, the light and the colour. To change the world, the prompt has to say the world changes, and then protect the subject on its own terms.

Does it repeat? Six runs, five clips

One good result is not a method, so we ran the same prompt shape on four more clips and ran the skate clip a second time. The subject held in 6 of 6 runs.

Two hands shaping grey clay on a wheel in a sunlit studio, above the same hands shaping terracotta clay in a stone cabin by firelight — **Hands on a pottery wheel.** Grey clay in a sunlit studio became terracotta in a stone cabin by firelight. Outline overlap 0.97; the ring, sleeve and finger positions match frame for frame.

A frosted perfume bottle turning on a white turntable in a grey studio, above the same bottle on dark slate in a misty pine forest at dawn — **A perfume bottle on a turntable.** A grey studio became a pine forest at dawn. Outline overlap 0.94; the shape, gold neck, cap, side label and rotation match.

A runner's legs in black tights and orange shoes splashing through puddles on a city street at dusk, above the same stride on a white salt flat at noon — **A runner's feet.** Wet pavement at dusk became a salt flat at noon. Outline overlap 0.75 above the ground line; the stride lands at the same moments, but the framing sits lower.

An orange toy buggy drifting round a backyard dirt corner, above the same buggy drifting round a red Martian dune — **A toy buggy on a fast pan.** A backyard track became a Martian desert. Outline overlap 0.69; the buggy's line through the corner matches.

Run	Kept subject	Outline overlap	Held
Glacier	Legs and sneakers	0.93	Yes
Glacier, run again	Legs and sneakers	0.80	Yes
Stone cabin	Two hands	0.97	Yes
Pine forest	Glass bottle	0.94	Yes
Salt flat	Legs and shoes	0.75	Yes, framing lower
Mars	Toy buggy	0.69	Yes

Outline overlap between the subject in the source and in the edit, averaged over 12 frames. Two unrelated clips score 0.00 to 0.17 on the same test. The same subject a moment later scores 0.17 to 0.57 on the clips that move quickly.

Watch for these

Watch for this:The place is redrawn, not kept. The model keeps the subject and invents a new world around it. It does not keep the old layout. The first glacier run flattened the curved bowl into open ice; the second run kept some of the curve. The runner's horizon moved too.

Source frame: a curved concrete bowl wall rising behind the skater — **Source.** A curved bowl wall.

First run: flat open ice with a ridge in the distance — **First run.** The curve became flat ice.

Second run: a curved wall of blue ice behind the skater — **Second run.** Some of the curve survived.

Watch for this:The same prompt twice is not equally tight. Both glacier runs used one prompt. The first overlapped the source at 0.93, the second at 0.80. If the first take drifts, run it again before you rewrite the prompt.

Watch for this:The camera move is close, not identical. On the skate and buggy clips, the edit followed the source's camera path closely but not exactly. The board-only takes, which left the world alone, followed it almost perfectly.

Watch for this:Glass shows the new world through it. The bottle's own label held, but the label seen through the glass from the other side is gone from the first frame: the glass now shows the forest light instead. Anything seen through the subject belongs to the world, and the world is redrawn.

Source: a frosted bottle in a grey studio with a cream label visible through the glass — Under half a second in. The shape, cap and neck hold; what shows through the glass does not.

Edit: the same bottle in a pine forest, the label seen through the glass gone — Under half a second in. The shape, cap and neck hold; what shows through the glass does not.

Watch for this:The sound is new. The edit comes back with a soundtrack the model made, even from a silent source. If your clip has dialogue or sound you need, put your original audio back under the edit.

What it costs

You pay for the length of your source clip. The price is shown before you generate.

Miroge: recast your clip
Priced on the Generate button
Takes A few minutes

Gemini Omni 1.1Pro and up
Per 5s clip
Standard 50 credits

Read live from the catalog when this page loads. Every price is shown before you generate. See every rate.

Questions and answers

Can I keep a person's face this way?: We have not tested it with a face in frame, so we do not promise it. In an earlier test with a whole person in the shot, the person was redrawn along with the place.
How long can my clip be?: Three to ten seconds. For a longer film, change one shot at a time and cut them back together.
Why not use the Miroge form?: The form changes one object and keeps everything else, including the background and the light. That is the right job for a prop swap and the wrong one for a new location.
Will the new place keep the layout of the old one?: No. The subject holds; the world around it is invented fresh. If the shape of the place matters, describe it in the change, and expect to run it more than once.

Change the world around your own clip.

Open Miroge

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