broll-compositelisted

# broll-composite Applies the cutaways chosen by broll-pick. For each pick `[t0,t1]` the whole 1080×1920 frame is replaced by the B-roll (hard cut, no transition). The 16:9 source is scaled to COVER and SUBJECT-cropped to 1080×1920 — full-bleed, never letterboxed (same philosophy as fill-vertical). The crop offset on the slack axis follows the cutaway's subject (a face if present, else a person, else the thresholded multi-frame saliency mass), so the subject reads centered instead of sliced off to one side. The podcast audio stays continuous for the whole clip; B-roll audio is dropped. No transition SFX by default — audio stays pure stream-copy. `BROLL_SFX=1` re-enables a 0.3s synthesized whoosh (make_whoosh.py, ~-15dBFS under speech) that sweeps up into each cutaway and down out of it. Runs BEFORE burn-subtitles so karaoke captions render on top of the cutaways. ## Invoke ``` .claude/skills/broll-composite/broll-composite.sh <in_clip.mp4> <broll_plan.json> <out.mp4> ``` - `in_clip`: the vertical 1080×1920 clip (from fill-vertical) - `broll_plan.json`: from broll-pick - `out`: composited clip ## Behavior - Zero picks, or every `clip_path` missing → copy-passthrough, exit 0. - A pick whose `clip_path` no longer exists is skipped; remaining picks apply. - ffmpeg failure → falls back to passthrough (never blocks the pipeline). ## Idempotency Caches on in_clip+plan mtimes + BROLL_SFX via `<out>.compmeta`. ## Notes - Subject-cover crop reuses fill-vertical's framing engi