AI avatar and lip-sync spec builder
AI avatar tools — HeyGen, Synthesia, D-ID — handle lip-sync automatically, but they don’t plan your video for you. A flat result usually comes from no thought about framing, expression timing, and runtime. This builder turns a script into a clean shot specification: it estimates spoken runtime from your word count and pacing, and assembles your avatar style, camera angle, background, and expression notes into a spec you can follow when configuring any avatar tool.
How it works
The builder estimates runtime by dividing your script’s word count by a words-per-minute pace (slow, natural, or brisk) — avatar tools bill and render against this duration, so knowing it up front avoids surprises. It then collects the framing decisions every avatar tool exposes: avatar style (professional, casual, stylized), camera angle (eye-level, slight low/high, close-up), and background (solid, office, blurred, custom). Finally, your expression notes let you mark where the delivery should shift — smile on the intro, emphasis on a key line, a pause before the call to action — so a long talking-head doesn’t read as robotic.
Tips for natural avatar videos
- Write for the ear. Short sentences and contractions lip-sync more naturally than dense written prose.
- Keep clips under ~90 seconds. Attention drops fast on talking-heads; split long scripts into scenes.
- Vary expression every 2-3 sentences. A single fixed expression is the giveaway of a generated avatar.
- Match background to context. A blurred office reads as professional; a solid brand color reads as an ad. Pick deliberately.