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How to edit a video by describing the change

Upload a clip, write what should change, and the AI re-renders the video with that change applied — restyle the whole scene, or alter one element in it while the rest holds. In the Photo to Video app for iPhone this is Edit Video mode. Clips run 3 to 15 seconds at 720p or 1080p, and you can add reference images to steer the result.

Steps

1. Open Edit Video. In the app, go to Modes and choose Edit Video.
2. Add the clip to edit. Pick a video from your camera roll.
3. Optionally add reference images. Useful when the change is a look you can show but not easily describe.
4. Describe the change. Be specific about what changes — and what must stay.
5. Generate and save. The result is a new clip; the original is untouched.

What it supports

Input	One video, plus optional reference images
Output	Video, 720p or 1080p
Length	3–15 seconds
Aspect ratio	Follows the source clip
Models	Happy Horse
Prompt	Required — it is the edit instruction
Platform	iPhone (iOS). No Android or web version.
Pricing	Credits per second, and this mode is the most expensive per second in the app — keep edits short.

Which model to use

This mode runs on Happy Horse only, so there is no model decision. What does need a decision is length: video-to-video editing bills for the clip going in as well as the clip coming out, which makes it the priciest mode per second here. Trim before you edit rather than after.

Getting a better result

• Trim to the seconds you actually need first. Cost scales directly with length, and this mode is the most expensive per second in the app.
• State what must not change. “Keep the subject and framing, change the season to winter” holds together far better than “make it wintry”.
• One change per pass. Stacked instructions get applied partially.
• Test the wording on a 3-second cut before committing to the full clip.

What people use it for

Restyling footage to match a look

The most reliable use of this mode: change the overall grade, era or medium of a clip rather than one element inside it.

Prompt restyle this clip as 1970s 16mm film, warm grain, softer contrast

Changing the season or time of day

A whole-scene change the model applies consistently across frames, which is where video-to-video beats editing stills one by one.

Prompt change the scene to winter: bare trees, snow on the ground, overcast light; keep the subject and camera move

Replacing a background you cannot reshoot

Say explicitly what holds still. Without that, the subject gets reinterpreted along with the background.

Prompt keep the subject and their movement exactly; replace the background with a quiet city street at night

Fixing one distracting element

Possible, but the least reliable use — the model works the whole frame, so a local change can pull the rest with it. Trim to the shortest cut containing the problem.

Prompt remove the bright sign in the top right; keep everything else identical

Where it struggles

This is the most expensive mode per second in the app, because video-to-video bills the clip going in as well as the one coming out — trim before you edit, not after. Localised changes are unreliable next to whole-scene ones, and the maximum length is 15 seconds.

Questions