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render-cartoon-music-video

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UpdatedJuly 19, 2026 at 03:10

Assemble a cartoon / animated / hand-crafted music-video ad from a config — a sung song carries the whole narrative while N per-bar i2v clips (one recurring animated character, one look pack) are each cut to their BAR window from librosa beat-tracking and hard-concatenated on the bar, VEED-whisper white bold-sans captions in the BOTTOM third (Alignment 2, above the logo bug, no pill) burned from the song's word timings re-spelled against the locked lyrics, a persistent brand logo bug held over the body (suppressed on the end card), and closed on a solid-brand-color PIL end card with the song still playing under it — never AI-rendered text. This is the FREE deterministic assembly stage (cut-to-bar + hard concat + logo bug + captions + end card + song mux); the song, character, keyframes, and clips come from create-music-elevenlabs / create-image-fal / create-video-fal. Use for the cartoon-music-video format.

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name	render-cartoon-music-video
description	Assemble a cartoon / animated / hand-crafted music-video ad from a config — a sung song carries the whole narrative while N per-bar i2v clips (one recurring animated character, one look pack) are each cut to their BAR window from librosa beat-tracking and hard-concatenated on the bar, VEED-whisper white bold-sans captions in the BOTTOM third (Alignment 2, above the logo bug, no pill) burned from the song's word timings re-spelled against the locked lyrics, a persistent brand logo bug held over the body (suppressed on the end card), and closed on a solid-brand-color PIL end card with the song still playing under it — never AI-rendered text. This is the FREE deterministic assembly stage (cut-to-bar + hard concat + logo bug + captions + end card + song mux); the song, character, keyframes, and clips come from create-music-elevenlabs / create-image-fal / create-video-fal. Use for the cartoon-music-video format.
status	active

render-cartoon-music-video

Assemble a cartoon music-video ad from a config: an animated / illustrated / hand-crafted story (stop-motion felt-and-foam, claymation, 2D toon, cut-out) where a sung song is the entire script and one recurring animated character carries every shot, cut to the bar with the climax line on the drop. This capability is the FREE, deterministic assembly — cut-to-bar, hard-concat, the logo bug + captions burn, and the solid-color end card.

scripts/config.example.json is the worked example (Coinbase "Bet on anything", ~55s 1080×1920 9:16, 16 body bars + a 3s end card); scripts/PIPELINE.md maps every config block to its source step and scripts/README.md documents the free assembly.

Run

This is the FREE, deterministic assembly stage — it spends nothing. The paid inputs are separate capabilities: the sung song (create-music-elevenlabs, or a user-supplied mp3 + Whisper word timings) beat-tracked with librosa so the BAR GRID sets the timeline; one locked recurring character + one keyframe per bar in one look pack (create-image-fal, Nano Banana); and one Seedance i2v clip per bar (create-video-fal). Given the song + word-timestamps.json + bars.json + one clip per bar + the brand wordmark SVG, render-cartoon-music-video cuts each clip to its bar window, hard-concats on the bar, burns the logo bug + captions, appends the solid-color end card, and muxes the song under it → the master. Re-cuts reuse the existing song / keyframes / clips and cost $0.

Contract (the free assembly)

The sung song carries the narrative — no separate VO. The generated/supplied track IS the bed (no VO to duck under); do not add a spoken voiceover or a second bed.
Plan the timeline AROUND the delivered song's BAR GRID. Beat-track the song with librosa (assume 4/4); one bar = one shot (default). Snap every tableau window to the bar boundaries — never trim the song to a pre-planned grid.
Captions from the song's word timings, re-spelled against the locked lyrics. Whisper mishears shouted accents ("BETS" → "Hearts"); re-spell the timed tokens against the locked lyric file (never edit lyrics to match Whisper). VEED-whisper white bold sans in the BOTTOM third (Alignment 2, margin_v above the bottom-left logo bug), ~4–5 words per cue, NO background pill; captions STOP at the end-card boundary. Never mid-frame — it covers the character (fixed 2026-07). If the host ffmpeg lacks libass, render the cues as timed PIL PNG overlays (ffmpeg overlay=…:enable='between(t,st,en)') at the same bottom placement.
Land the climax line on the drop. The climax tableau is timed so the payoff line sits on the sub-bass drop; accent that line.
Persistent logo bug, suppressed on the end card. Burn a white brand wordmark bottom-left over the body bars (cairosvg → PIL from the real SVG), suppressed on the end card where the big wordmark dominates.
End card via cairosvg + PIL from the real wordmark — never AI-render brand text. Solid brand-color card + white wordmark + subhead, holding ~3s WITH the song still playing under it (afade-out over the tail — no silent tail). A diffusion model garbles a wordmark.
FFmpeg composite, deterministic, FREE. Cut each clip to its bar window, hard-concat, burn the logo bug + captions, append the end card, mux the song over the whole video with a 0.5s afade tail, loudnorm I=-14 → a 1080×1920 h264+aac master. No paid calls, no keys. When the host ffmpeg lacks libass/drawtext, BOTH the captions and the logo bug are timed PIL PNG overlays (overlay=x:y:enable='between(t,st,en)'), not an ASS burn.
QC PER SCENE, never just the master — the two failure modes are content, not assembly. The upstream keyframe/i2v steps can (a) drift the character felt → smooth-3D "man" partway through and (b) hallucinate hands — realistic fingers in a hand macro, a pointing finger on a "tap the phone" shot, or a disembodied hand sliding in from the frame edge. Both hide at thumbnail size. Extract a 2 fps contact sheet + a per-bar FACE crop and HAND crop (across each clip's full duration), confirm every bar is matte felt with the ONE character and no human/floating hands, and re-check the served bytes after publish. A drifted bar means regenerating that bar's KEYFRAME (not re-cutting) — see the recipe STEP 3/6.

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