niche_render_reel

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Render a 9:16 vertical reel for a session at CP3. A per-beat script (typically 4-7 beats) is composited into one video: stills, voiceover, motion, caption overlays, and an endcard (~30-120s). Reels are delivered as a downloadable file for the user to publish. scope: 'full' (default) renders a new reel. 'recomposite' re-renders presentation only (captions on/off, caption_sync_mode, endcard text) from the retained footage at no charge. 'endcard' is the same, limited to the endcard. 'beat:N' re-renders a single beat's still (optional beat_direction), charged for that one image; everything else is reused. Idempotent on the video output: a prior render is replaced. Options: captions_enabled (default true) overlays per-beat captions; music_enabled (default false) mixes background music under the voiceover; tone shapes the script (default | punchy | direct | reflective), with reel_direction for free-form direction beyond those words; length or target_duration_sec set the runtime target; music_direction shapes the music; voice picks the voiceover voice; endcard_mark chooses the endcard brand mark; needs_legible_text forces a text-capable still generator; caption_sync_mode (default 'phrase') reveals captions phrase-by-phrase in sync with the voiceover at no extra cost, and is ignored when captions_enabled is false. Errors: 503 if reel rendering is unavailable; 400 before CP3; 422 if the script is unusable. Cost: ~350 credits.