lab_reference_motion

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Render a new clip FROM the motion of an existing one: your reference clip leads (camera move, blocking, timing), the model restyles what happens in it. Pass the clip's URL directly — the one you already have from lab_list_assets (asset_type 'video'), lab_job_status or lab_review_queue; nothing is looked up. Reference images bind cast, place and look; in_sec/out_sec cut the reference server-side before it ever reaches the provider, so you pay for the excerpt, not the source. Same backend path as lab_animate's source_video_id, with the fields that only exist there. Costs credits when called without get_cost. WITHOUT a reference clip (leave reference_video_url out), the images and sounds in `referenzen` alone guide the run — only for models whose lab_list_models entry says referenzen_ohne_video: true, and only FACELESS references (ort, stil, bild, stimme, ton): Seedance 2.5 rejects faces as reference images, even invented characters (measured 2026-09-27), so `figur` is refused before anything is charged. For a person, build a still with them first and animate it with lab_animate. Name the references in the prompt as 'reference only, never shown on screen', and avoid the word 'static' for short shots — it tends to return frozen frames.