Why Lip Sync Breaks in AI Video
AI actors generate mouth shapes based on phonetic input, not visual timing. If dialogue is too fast, too slow, or packed with clustered consonants, lips lag or overshoot the intended frame. On iaiav, mismatched audio causes the same-face actor to look like they're dubbing a foreign film.
Count Syllables, Not Seconds
Time dialogue by syllable count per second rather than raw duration. Aim for 3-4 syllables per second for natural pacing. Use iaiav's AI script writer to flag lines exceeding 12 syllables per phrase, then break them into shorter beats that align with mouth animation frames.
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Consonants Need Space
Hard consonants (p, b, t, d) require visual closure and release. Packing them tightly creates muddy or delayed lip movements. Place a brief pause after strong consonants. iaiav's dialect voice system renders these accurately when given space in the script.
Use Visual Cues in Script Notes
Mark mouth movements in brackets: [smile], [pause], [lips together]. These cues guide AI actors during generation. On iaiav, including visual context helps maintain facial consistency across episodes when reusing the same face.
Test Short Clips Before Full Renders
Render 3-5 second test clips of problem lines before full episode generation. Compare mouth shapes frame-by-frame. iaiav allows quote-before-shoot with refunds, so testing early prevents wasted credits on bad lip sync.
Rewrite When Sync Won't Budge
Sometimes dialogue must change. Replace problematic phrases with phonetically simpler alternatives. Use iaiav's remake templates to quickly regenerate scenes after rewriting. A slight script tweak often fixes persistent sync issues.
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