How to replace a person in a video with someone from a photo
Upload the clip and a photo of the person who should appear instead, and tell Vizard Agent which person to replace. Vizard Agent picks a frame where the face is clear, tests the swap on that one frame in two versions, compares them against the original, and only then processes the clip in segments.
What do you type into Vizard Agent?
Say who replaces whom and what must not change. Vizard Agent looks at both files itself to identify the people involved, so a short instruction naming the swap is enough. Use a clear, front-facing, well-lit photo, because it sets the ceiling on the result, and make sure both people have agreed.
Prompt
What does Vizard Agent actually do?
The whole shape of the run is caution: one frame, then two versions of that frame, then a three-second test, and only then the full clip in pieces. Two versions of a single frame cost almost nothing and show whether the likeness will hold before real work is spent. In the session behind this article it:
- Inspected the video and the photograph, extracted frames from the clip, and checked the available tools and their prices before committing to anything.
- Chose the frame where the face was clearest, ran the swap on it in two versions and compared both against the original.
- Ran the full clip, read the error log when it failed, and checked the tool's duration limits.
- Confirmed the approach worked on a three-second test, then split the clip into two segments, processed both and compared each against the original.
- Rejoined them with the original audio and checked motion and sync, delivering 3.0 seconds of vertical video at 576x1024 and 30fps.
When does this not work well?
The technical limits are narrow and the ethical ones are narrower. Both people, the one in the photo and the one in the video, have to agree, and it's never for deception. Label it, even as a joke. Quality and cost both work against length, and a face turning away, a hand across it or motion blur make the swap fail visibly.
Common questions
Do I need permission? Yes, from both people. This is the one requirement Vizard Agent cannot check for you.
How long can the clip be? Seconds. Vizard Agent splits longer clips into segments, and quality and cost both argue for keeping it short.
Can I test it cheaply first? Yes. Ask Vizard Agent for a single frame or a three-second test before committing to the full clip.