update_clips

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Update one or more clips in a single call — background, transition, duration, title, visibility, position, and (video clips) the footage transform via video_styling. Always batch. Each entry: { clip_index, duration?, title?, background_color? | background?, transition?, hidden?, position?, voiceover_volume?, video_styling? } - voiceover_volume: 0-100. This is how you make a clip SILENT — set 0 to mute the narration while keeping the text and its word timings. get_clip and get_project report the current value, so read it before muting to restore it later. There is no "delete voiceover" tool; muting is the supported way. - background_color: hex (keeps the existing pattern/image, changes color). background: full object from find(type='backgrounds') — replaces the whole background. - transition: { type, duration, direction?, color? }, or null to remove. Set on the OUTGOING clip — the transition plays at the END of clip_index, into the next clip. Types: circleWipe, rainbowWipe, cornerWipe, stack, colorWipe, dissolve, pushPull, fadeToColor. Directions: rainbowWipe/cornerWipe take topLeft|topRight|bottomLeft|bottomRight; colorWipe left|right; stack/pushPull left|right|top|bottom. - position: move the clip to a new zero-based index. Moves apply FIRST (in array order), then property patches — keep reorders in a separate call from property edits so indices stay predictable. - video_styling (VIDEO CLIPS ONLY — ignored on slide clips): reposition/resize the clip's recording on the canvas, e.g. into a designed window slot. { position?: [cx, cy], size?: [w, h] } as canvas fractions 0–1 ([1,1] = full-bleed, position is the footage CENTER), plus crop? and border?. Fields merge onto the clip's existing video_styling. Concurrency: parallel-safe per clip — all property updates land in ONE save. Safe to fan out across DIFFERENT clips. Do NOT run concurrently with element/voiceover edits on the SAME clip, or whole-project mutations (add_clips, add_audio, update_project). When adding audio + resizing clips, run update_clips BEFORE add_audio.