Animate a character with your own performance in Runway Act-Two

Runway’s Act-Two uses a recorded performance to animate a character image or video. Your acting supplies timing and expression; the reference sets the character’s appearance. It requires a Standard plan or higher and supports performances up to 30 seconds.[1]

For a first exercise, imagine an illustrated lighthouse keeper who has just noticed something unexpected offshore. Record yourself saying an original line, such as “That light was not there a moment ago.” Try it with curiosity, then with relief. These are suggested creative experiments, not generated examples or a hands-on test.

Choose the reference that fits the shot

Use Runway’s web interface for this walkthrough. Its Apps documentation says these workflows are unavailable inside the iOS app, although a mobile browser can access them.[2]

Choose a single visible character. Keep the performer’s face visible in an uncut, well-lit, waist-up shot. For gestures, show the hands and match the reference’s starting pose.[1]

For the lighthouse keeper, select an image with room around the shoulders and decide what the moment means before recording. A slow look towards the horizon conveys a different thought from an immediate startled reaction. Perform both timings while keeping the spoken line unchanged, so the comparison is about delivery.

Runway lists JPEG, PNG and WebP image inputs. Its video support includes MP4 with H.264; that combination is also its suggested alternative when a file’s codec causes trouble. A filename extension alone does not identify the video encoding inside.[3]

Generate a short take

Open Apps → Performance Capture with Act-Two. Upload both inputs. For images, choose Gestures if wanted. Keep default facial expressiveness, review cost and select Generate.[1]

Act-Two costs five credits per second, with a three-second minimum: an eight-second take therefore uses 40 credits.[1]

Keep the first pass short enough to inspect closely. Watch it once without looking at the original performance, then compare them. Does the pause arrive before the character speaks? Does the expression match the meaning you intended? Does a hand movement distract from the line? These are proposed acceptance questions for this scene.

If the timing is wrong in your recording, change the performance. If the intended emotion is present but the result distorts the character, try a more restrained take. Change one input deliberately, then decide whether the new result improves the scene. A visually striking clip is useful only if it communicates the moment you chose.

Keep the take and the material behind it

Runway’s Assets area contains uploaded files and generated outputs; Recents shows generated material only. Use Assets when looking for the performance, reference and result together.[4]

On a computer, select those files in Assets with Ctrl-click on Windows or Command-click on Mac. Open Actions in the floating menu and choose Download. Runway packages the selection as a ZIP.[5]

Open the downloaded archive and play the selected take before bringing it into an edit. Keep the two inputs beside it, named to show which performance produced which result. You then have a small, inspectable piece of animation and the material needed to develop its next version.

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