MAJORFailure Reference

Hailuo AI Lip Sync Failure — Pre-Generation Risk Reference

Technical Classification

Audio-Visual Lip Sync & Phoneme Alignment Failure

Hailuo's talking-head and dialogue generations frequently produce mouth motion that is temporally misaligned with the audio track. Phoneme-to-viseme mapping is approximate rather than ground-truth — the audio says "hello" but the mouth shape is closer to "okay." On longer dialogue clips the drift compounds, and the mouth eventually opens during silent passages or closes during continued speech. Output is unusable for any dialogue-driven content.

How to identify this failure

✕Mouth motion lagging audio by 100–500ms
✕Wrong viseme shape for the audible phoneme
✕Mouth open during silent passages
✕Mouth closed during continued speech
✕Lip sync degrading as the clip progresses

Real generation examples

Prompt used

"Woman saying 'Welcome to the show' direct to camera"

Failure observed @ 0:01

Mouth motion lagged audio by ~300ms throughout; viseme for 'show' was wrong

Prompt used

"Man delivering a 4-second monologue about coffee"

Failure observed @ 0:03

Sync drift accumulated — by 0:03 the mouth was a full word behind audio; mouth opened during silent gap

Documentation strength

If you need to escalate

HIGH — Hailuo support recognises lip-sync drift as a current model limitation; refunds granted on documented audio-visual mismatch.

AVA is a pre-purchase prevention tool, not a post-purchase recovery tool. Platforms generally do not guarantee credit refunds for output-quality failures; goodwill credits are at each platform's discretion. The strength rating reflects how well-formed your support ticket can be, not a promised outcome.

Prevention + documentation steps

01
Score your prompt before you generate
Run your prompt through AVA's pre-flight scoring against the Audio-Visual Lip Sync & Phoneme Alignment Failure pattern. Green light = generate. Yellow/red = rewrite using the suggested fix before you commit credits.
02
Capture Generation ID + timestamp if it failed anyway
Find the Generation ID in the URL or share link. Note the exact time when the Audio-Visual Lip Sync & Phoneme Alignment Failure first appears (e.g. "failure first visible at 1.2s"). Timestamped evidence is significantly stronger than a general complaint.
03
Use the correct technical term in your support ticket
Describe this failure as "Audio-Visual Lip Sync & Phoneme Alignment Failure". This term maps to a recognised internal workflow in the support system and routes the ticket to the right team.
04
Submit via the correct support channel
Runway has no direct email intake. Pro+ plan: open the in-app AI Assistant (help widget bottom-right of app.runwayml.com), describe the failure with the technical term, attach evidence. Free/Standard plan: human support isn't available — your channel is Discord #community-help with @On Call - Moderators.

Frequently asked questions

Does Hailuo refund credits for lip sync failures?

Yes. Submit the generation ID, the audio track, and a screen recording showing the mouth motion vs the audio waveform. Hailuo support refunds documented lip-sync drift.

Why does Hailuo fail at lip sync?

Hailuo's viseme model maps phonemes to mouth shapes statistically, not via ground-truth alignment. On longer clips the temporal alignment loss compounds, producing audible drift.

How do I get usable lip sync from Hailuo?

Keep dialogue clips ≤2 seconds. Re-time audio in post if the model output is close-but-not-tight. Avoid clips that require precise sync (commercials, narration). AVA flags lip-sync risk in dialogue prompts.

Score your prompt

Score your prompt against this failure mode in 30 seconds

Paste your prompt and the platform you intend to use. AVA returns a red/yellow/green score against this specific failure mode plus a concrete rewrite if the risk is high.

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