Use motion transfer when the order and timing of a recorded performance matter. Use ordinary image-to-video when you want to invent movement from a still image and can describe the result without preserving a particular recording. A person raising a cup is a motion idea; reproducing their pause, wrist turn and head reaction is a performance requirement.
Decide what would make the result wrong
Write one sentence identifying the essential event. “The character dances energetically” allows substantial variation. “The left hand rises before the head turns, then both settle together” creates observable conditions. Neither sentence requires a long screenplay.
Now imagine a result with the right costume and atmosphere but different timing. Would it still serve your project? If yes, a written motion brief may be enough. If the timing carries a joke, a recognizable dance phrase or a teaching demonstration, preserve a recording that actually shows it.
Understand the two input arrangements
Runway describes Kling Motion Control as animating a character image from a performance video. Its image-to-video guide instead assigns scene appearance to the image and motion instructions to text.
Those documented arrangements give you a useful way to inspect another tool. Look for separate fields with explicit roles, rather than assuming that an attachment named “reference” controls everything.
| Your priority | Evidence to prepare | What to inspect |
|---|---|---|
| A particular gesture sequence | Clear performance recording | Order, direction and pauses |
| A new camera reveal | Approved scene image and motion brief | Subject visibility and reveal |
| A character giving a reaction | Face reference and suitable performance | Expression and hand ownership |
| A general animated illustration | Complete still composition | Stable shapes and readable movement |
Compare one meaningful segment
Choose a short segment containing the hardest visible event, not merely the most attractive opening. An overhead arm movement tests different information from a quiet nod. Keep the exact same character reference while comparing methods so that a changed face or costume does not obscure the motion question.
Before generating, list three moments to review: preparation, peak action and recovery. Afterward, compare the source and result at those moments, then play both normally. Paused poses reveal position errors; playback reveals a missing pause or a sudden acceleration.
If you cannot identify the intended action in the recording, improve the source before writing more instructions. A tool choice cannot supply evidence that your video never captured.
Choose the smaller production commitment
A transferable movement can become one shot in a larger film. It does not establish the next location, another character's reaction or the final edit. Keep those decisions in the shot plan.
Record the selected method, input filenames and acceptance conditions before scaling up. Use a planning workspace to organize them, then check the actual generation tool's supported inputs. A copied prompt alone is not proof that a performance-video field exists.
Questions that change the choice
Can I describe a dance instead of uploading it?
Yes, if an interpretation is acceptable. Naming a dance or explaining its mood does not give the model the recording's complete timing and visible transitions.
Does motion transfer mean an exact duplicate?
Evaluate that separately. A supported motion-reference feature is a reason to test the method, not a guarantee that every limb, camera position and intermediate frame will match.