soundlisted

# Sound The video is cut **to the music**, not the other way round: tempo first, cuts after. ## Music - Find the BPM and the first beat (`beatOffset`). At 120 BPM one beat = 0.5 s and a 4-beat bar = 2 s. Declare `bpm` and `beatOffset` in the scene. - If the track doesn't fit the duration, cut it by bars with ffmpeg: soft intro → strong entry → groove → the intro returns → final hit. - Leave 1.5–2.5 s at the end to read the closing line. - Licenses: Pixabay allows commercial use without attribution, but **not redistributing the track on its own**; don't commit it to the repo (do commit the cutting script). If YouTube claims it via Content ID, dispute it with the license. ### Synthesized music (license-free) If there is no track, it can be generated with code: `sandbox/2026-09-24-exquisite-corpse/music.mjs` writes a WAV with kick, snare, hi-hat, bass, sitar and a filtered pad, and changes texture at the same seconds as the scene's segments. It is deterministic, so the `.wav` is not committed: it is regenerated. Without listening to it, check it with the waveform (`ffmpeg -i mix.wav -filter_complex showwavespic=s=1600x240 -frames:v 1 wave.png`) and `volumedetect`: no segment should end up nearly flat. ### Generated music (ElevenLabs Music) `POST https://api.elevenlabs.io/v1/music` (key in `ELEVENLABS_API_KEY`, never in the repo; commercial use = paid plan; the track is third-party audio: keep it in the experiment's `private/` or `out/`, never committed). - A plain